Swift/Kotlin愛好会 Advent Calendar 2021

14 participant

46 subscriber

49 likes

Category：Programming language

Creator：

@jollyjoester

Swift愛好会とKotlin愛好会のアドベントカレンダーだよ！

今年の締めくくりもわいわいやっていこう！
SwiftかKotlinにちょっとでも関連のあるネタならなんでもOK

参加したことある人もない人もSwiftもKotlinも実は書いてないかもって人もみんなござれ〜
かーーーんぱーーーーい！！！

■connpass
https://love-swift.connpass.com/
https://love-kotlin.connpass.com/

How to join the calendar

You can join the calendar by selecting an available date and registering the URL of the article you wish to link to. If a slot is available, you can go back to a past date to join!

Series 1

Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
28	29	30	@jollyjoester ゆる〜く学ぶSwiftのConcurrency ~前半~ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tarumzu launchWhen〇〇〇は止めてrepeatOnLifecycleを使おう！ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@n_takehata 【Kotlin初心者向け】KotlinでvarとMutableListを使わなくする方法 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@uhooi クロージャでメモリリークする原因と解決策(Swift) Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@jollyjoester ゆる〜く学ぶSwiftのConcurrency ~後半~ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@aki_artisan 【Swift】前の○曜日の日付を出力する関数 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@keisukeYamagishi スクロールした分だけ、NavigationBarをせり上げる Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@wrongwrong jackon-module-kotlinでvalue class(inline class)をシリアライズする Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@wrongwrong jackon-module-kotlinでvalue class(inline class)をシリアライズする【解説編】 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@keisukeYamagishi メモリリークテスト Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@jollyjoester Kotlinでクイズ：順列 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@SatoTakeshiX iOS 15でNavigationBarとTabBarがデフォルトで透過される Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@goofmint NCMB Kotlin SDK（デベロッパープレビュー）で各種データを保存してみる Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@uhooi Swift Package内のリソースにアクセスする便利な方法 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@fumiyasac@github Androidアプリでバックグラウンド再生機能を実現するためのヒントとiOSアプリとの見比べた際の特徴を簡単にまとめてみた Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@m_yukio [Kotlin]Google Play Billing Library Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@uhooi 「依存性逆転の原則」と「依存性の注入」を完全に理解した Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@jollyjoester なにか書く Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
Join calendar on 19 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@uhooi classにfinalを付ける基準(Swift) Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@katopan Swiftで学ぶソートアルゴリズム入門 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@minmin0530 Socket.IOをSwiftで使う Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 23 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@freddi_ うぇい Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@jollyjoester Swift/Kotlin愛好会 2021 Recap #love_swift #love_kotlin Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use

@jollyjoester
ゆる〜く学ぶSwiftのConcurrency ~前半~
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URL
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@tarumzu
launchWhen〇〇〇は止めてrepeatOnLifecycleを使おう！
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@n_takehata
【Kotlin初心者向け】KotlinでvarとMutableListを使わなくする方法
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@uhooi
クロージャでメモリリークする原因と解決策(Swift)
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@jollyjoester
ゆる〜く学ぶSwiftのConcurrency ~後半~
Overwrite
Title
URL
You can post either your article on Qiita or your blog post.
About reserved posting
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@aki_artisan
【Swift】前の○曜日の日付を出力する関数
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@keisukeYamagishi
スクロールした分だけ、NavigationBarをせり上げる
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@wrongwrong
jackon-module-kotlinでvalue class(inline class)をシリアライズする
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@wrongwrong
jackon-module-kotlinでvalue class(inline class)をシリアライズする【解説編】
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@keisukeYamagishi
メモリリークテスト
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@jollyjoester
Kotlinでクイズ：順列
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@SatoTakeshiX
iOS 15でNavigationBarとTabBarがデフォルトで透過される
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@goofmint
NCMB Kotlin SDK（デベロッパープレビュー）で各種データを保存してみる
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URL
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@uhooi
Swift Package内のリソースにアクセスする便利な方法
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@fumiyasac@github
Androidアプリでバックグラウンド再生機能を実現するためのヒントとiOSアプリとの見比べた際の特徴を簡単にまとめてみた
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@m_yukio
[Kotlin]Google Play Billing Library
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@uhooi
「依存性逆転の原則」と「依存性の注入」を完全に理解した
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@jollyjoester
なにか書く
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Join calendar on 19 day
You can also reserve a slot without registering a title or URL.
Title
URL
Articles to be submitted are welcome on any website as well as on Qiita.
About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
About posting period
Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.)
When you participate, we will assume that you have agreed to the terms of use
@uhooi
classにfinalを付ける基準(Swift)
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@katopan
Swiftで学ぶソートアルゴリズム入門
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@minmin0530
Socket.IOをSwiftで使う
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Join calendar on 23 day
You can also reserve a slot without registering a title or URL.
Title
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About reserved posting
If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day.
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@freddi_
うぇい
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@jollyjoester
Swift/Kotlin愛好会 2021 Recap #love_swift #love_kotlin
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Sunday	Monday	Tuesday	Wednesday	Thursday	Friday	Saturday
28	29	30	@jollyjoester ゆる〜く学ぶSwiftのConcurrency ~前半~ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@tarumzu launchWhen〇〇〇は止めてrepeatOnLifecycleを使おう！ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@n_takehata 【Kotlin初心者向け】KotlinでvarとMutableListを使わなくする方法 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@uhooi クロージャでメモリリークする原因と解決策(Swift) Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@jollyjoester ゆる〜く学ぶSwiftのConcurrency ~後半~ Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@aki_artisan 【Swift】前の○曜日の日付を出力する関数 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@keisukeYamagishi スクロールした分だけ、NavigationBarをせり上げる Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@wrongwrong jackon-module-kotlinでvalue class(inline class)をシリアライズする Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@wrongwrong jackon-module-kotlinでvalue class(inline class)をシリアライズする【解説編】 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@keisukeYamagishi メモリリークテスト Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@jollyjoester Kotlinでクイズ：順列 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
@SatoTakeshiX iOS 15でNavigationBarとTabBarがデフォルトで透過される Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@goofmint NCMB Kotlin SDK（デベロッパープレビュー）で各種データを保存してみる Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@uhooi Swift Package内のリソースにアクセスする便利な方法 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@fumiyasac@github Androidアプリでバックグラウンド再生機能を実現するためのヒントとiOSアプリとの見比べた際の特徴を簡単にまとめてみた Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@m_yukio [Kotlin]Google Play Billing Library Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@uhooi 「依存性逆転の原則」と「依存性の注入」を完全に理解した Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@jollyjoester なにか書く Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use
Join calendar on 19 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@uhooi classにfinalを付ける基準(Swift) Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@katopan Swiftで学ぶソートアルゴリズム入門 Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@minmin0530 Socket.IOをSwiftで使う Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	Join calendar on 23 day You can also reserve a slot without registering a title or URL. Title URL Articles to be submitted are welcome on any website as well as on Qiita. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@freddi_ うぇい Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use	@jollyjoester Swift/Kotlin愛好会 2021 Recap #love_swift #love_kotlin Overwrite Title URL You can post either your article on Qiita or your blog post. About reserved posting If you register a secret article by the day before the same day, it will be automatically published around 7:00 on the same day. About posting period Only articles submitted after November 1 of the year can be registered. (Secret articles can be registered anytime articles are posted.) When you participate, we will assume that you have agreed to the terms of use

@jollyjoester
ゆる〜く学ぶSwiftのConcurrency ~前半~
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@tarumzu
launchWhen〇〇〇は止めてrepeatOnLifecycleを使おう！
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@n_takehata
【Kotlin初心者向け】KotlinでvarとMutableListを使わなくする方法
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@uhooi
クロージャでメモリリークする原因と解決策(Swift)
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@jollyjoester
ゆる〜く学ぶSwiftのConcurrency ~後半~
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@aki_artisan
【Swift】前の○曜日の日付を出力する関数
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@keisukeYamagishi
スクロールした分だけ、NavigationBarをせり上げる
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@wrongwrong
jackon-module-kotlinでvalue class(inline class)をシリアライズする
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@wrongwrong
jackon-module-kotlinでvalue class(inline class)をシリアライズする【解説編】
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@keisukeYamagishi
メモリリークテスト
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@jollyjoester
Kotlinでクイズ：順列
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@SatoTakeshiX
iOS 15でNavigationBarとTabBarがデフォルトで透過される
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@goofmint
NCMB Kotlin SDK（デベロッパープレビュー）で各種データを保存してみる
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@uhooi
Swift Package内のリソースにアクセスする便利な方法
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@fumiyasac@github
Androidアプリでバックグラウンド再生機能を実現するためのヒントとiOSアプリとの見比べた際の特徴を簡単にまとめてみた
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@m_yukio
[Kotlin]Google Play Billing Library
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@uhooi
「依存性逆転の原則」と「依存性の注入」を完全に理解した
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@jollyjoester
なにか書く
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Join calendar on 19 day
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@uhooi
classにfinalを付ける基準(Swift)
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@katopan
Swiftで学ぶソートアルゴリズム入門
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@minmin0530
Socket.IOをSwiftで使う
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@freddi_
うぇい
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@jollyjoester
Swift/Kotlin愛好会 2021 Recap #love_swift #love_kotlin
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You can increase the number of series when Calendar 1 is filled with more than 10 articles.

Swift/Kotlin愛好会 Advent Calendar 2021

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