Swift から MDCSwipeToChoose を使う

MDCSwipeToChoose を Swift から使ってみる時のメモ。

Podfile の準備

Podfile を作って pod install

platform :ios, "8.0"
pod 'MDCSwipeToChoose'

Bridging Header の準備

UIKit も import しておかないとエラーになります。

BridgingHeader.h

#ifndef BridgingHeader_h
#define BridgingHeader_h

#import <UIKit/UIKit.h>
#import <MDCSwipeToChoose/MDCSwipeToChoose.h>

#endif

ViewController 中に配置

import UIKit

// ... in a view controller

override func viewDidLoad() {
    super.viewDidLoad()

    var options = MDCSwipeToChooseViewOptions()
    options.delegate = self
    options.likedText = "Keep"
    options.likedColor = UIColor.blueColor()
    options.nopeText = "Delete"
    options.onPan = { state -> Void in
        if state.thresholdRatio == 1 && state.direction == MDCSwipeDirection.Left {
            println("Photo deleted!")
        }
    }

    var view = MDCSwipeToChooseView(frame: self.view.bounds, options: options)
    view.imageView.image = UIImage(named: "photo.png")
    self.view.addSubview(view)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
}

// This is called when a user didn't fully swipe left or right.
func viewDidCancelSwipe(view: UIView) -> Void{
    println("Couldn't decide, huh?")
}

// Sent before a choice is made. Cancel the choice by returning `false`. Otherwise return `true`.
func view(view: UIView, shouldBeChosenWithDirection: MDCSwipeDirection) -> Bool{
    if (shouldBeChosenWithDirection == MDCSwipeDirection.Left) {
        return true;
    } else {
        // Snap the view back and cancel the choice.
        UIView.animateWithDuration(0.16, animations: { () -> Void in
            view.transform = CGAffineTransformIdentity
            view.center = view.superview!.center
        })
        return false;
    }
}

// This is called then a user swipes the view fully left or right.
func view(view: UIView, wasChosenWithDirection: MDCSwipeDirection) -> Void{
    if wasChosenWithDirection == MDCSwipeDirection.Left {
        println("Photo deleted!")
    }else{
        println("Photo saved!")
    }
}