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Closure を使って幸せ Parse 生活

Last updated at Posted at 2014-06-16

いちいちfindObjects...とか打つの面倒だしViewControllerが汚くなるのでラッピングしましょう。
それに、(objects as PFObject[]!).map {...}が美しくないです。

Message.swift
class Message {
    class func findAllByUserWithBlock (user: PFObject!, callback: (PFObject[]!)->()) {
        let query = PFQuery(className: "Message")
        query.whereKey("user", equalTo: user)
        query.findObjectsInBackgroundWithBlock {(objects : AnyObject[]!, error: NSError!) in
            if (objects.count > 0) {
                callback(objects as PFObject[]!)
            }
        }
    }
}
HogeViewController.swift
let user = PFUser.currentUser()
Message.findAllByUserWithBlock(user) {(messages: PFObject[]!) in
    self.messages = messages.map {(message: PFObject!) in JSQMessage(text: message["text"] as String, sender: message["sender"] as String, date: message.createdAt)}
}

まあまあ心が洗われる文法になりました。
PFObjectもラッピングしてあげればas String[""]も不要になりますね。
面倒くさいです。

ちなみにブロックはrubyのごとく()の外に出して呼ぶことが出来ます。
jQueryでよく見るような})を沢山見なくてすみますね。

PFUserも悲しい書き方がたくさん出来てしまうので、extension使って汚いコードを押し込みましょう。

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