ios - Xcode 7.1 中没有 "Run in Full Simulator"的 UIView 动画？

Question

我正在尝试使用 UIView.transitionFromView 在 Playground 中的两个 View 之间制作一个简单的翻转动画。如本 question 中所述，旧版本的 Xcode 只需要选择“在完整模拟器中运行”选项，但在 Xcode 7.1 的 Platform 下的 Playground Settings 中不再可用。

在我的工作示例中，底 View 总是立即显示。执行过渡，但使用任何动画:

import UIKit
import XCPlayground

XCPlaygroundPage.currentPage.needsIndefiniteExecution = true

func flipFrontToBack(frontView: UIView, backView: UIView) {

   let transitionOptions = UIViewAnimationOptions.TransitionFlipFromLeft

   var views : (frontView: UIView, backView: UIView)

   views = (frontView: frontView, backView: backView)

   UIView.transitionFromView(views.frontView,
      toView: views.backView,
      duration: 2.0,
      options: transitionOptions,
      completion: { _ in
   })
}

func smallSquare(backgroundColor: UIColor, borderColor: UIColor) ->     UIView {
    let bounds = CGRect(x: 50, y: 50, width: 50, height: 50)
    let view = UIView(frame: bounds)
    view.backgroundColor = backgroundColor
    view.layer.borderColor = borderColor.CGColor
    view.layer.borderWidth = 5
    view.layer.cornerRadius = 10

    return view
}

func makeView() -> UIView {
    let bounds = CGRect(x: 0, y: 0, width: 400, height: 200)
    let view = UIView(frame: bounds)
    view.backgroundColor = UIColor.lightGrayColor()
    view.layer.borderColor = UIColor.purpleColor().CGColor
    view.layer.borderWidth = 5
    view.layer.cornerRadius = 10

    return view
}

let view = makeView()

var frontCard = smallSquare(UIColor.blackColor(), borderColor: UIColor.whiteColor())
var backCard = smallSquare(UIColor.whiteColor(), borderColor: UIColor.redColor())

view.addSubview(backCard)
view.addSubview(frontCard)
XCPlaygroundPage.currentPage.liveView = view

flipFrontToBack(frontCard, backView: backCard)

我的代码在我的 Xcode 项目中运行。我只是想将它迁移到 Playground，这样我就可以对一些额外的更改进行原型(prototype)设计。通过注释掉 ** flipFrontToBack()** 方法，您可以看到未翻转和“翻转”的图像。所以，我得到了翻转，但没有动画。

Answer 1

我取得了一点进步。我必须使用 NSTimer 来安排翻转至少 0.1 秒。容器翻转，而不是两张牌，但这是另一个问题。我还重构了一个类，因为一旦你超越几行，它们似乎更容易使用。无论如何，一些“工作”代码:

import UIKit
import XCPlayground

XCPlaygroundPage.currentPage.needsIndefiniteExecution = true

class MyView: UIView {

    var frontCard:UIView!
    var backCard:UIView!

    func makeView() {

        self.backgroundColor = UIColor.lightGrayColor()
        self.layer.borderColor = UIColor.purpleColor().CGColor
        self.layer.borderWidth = 5
        self.layer.cornerRadius = 10

    }


    func flipFrontToBack(frontView: UIView, backView: UIView) {

        let transitionOptions = UIViewAnimationOptions.    TransitionFlipFromLeft

        var views : (frontView: UIView, backView: UIView)

        views = (frontView: frontView, backView: backView)
        /*
        http://stackoverflow.com/questions/24413539/uiview-    transitionwithview-swift-syntax
        */

        UIView.transitionFromView(views.frontView,
            toView: views.backView,
            duration: 2.0,
            options: transitionOptions,
            completion: { _ in
        })
    }

    func smallSquare(backgroundColor: UIColor, borderColor:     UIColor) -> UIView {
        let bounds = CGRect(x: 50, y: 50, width: 50, height: 50)
        let view = UIView(frame: bounds)
        view.backgroundColor = backgroundColor
        view.layer.borderColor = borderColor.CGColor
        view.layer.borderWidth = 5
        view.layer.cornerRadius = 10

        return view
    }

    override init(frame: CGRect) {

        super.init(frame: frame)

        frontCard = smallSquare(UIColor.blackColor(), borderColor:     UIColor.whiteColor())
        backCard = smallSquare(UIColor.whiteColor(), borderColor:     UIColor.redColor())

        makeView()

        self.addSubview(backCard)
        self.addSubview(frontCard)

    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func update() {
        flipFrontToBack(frontCard, backView: backCard)
    }

    func flipIt() {
        NSTimer.scheduledTimerWithTimeInterval(0.1, target: self,     selector: "update", userInfo: nil, repeats: false)

    }
}

let bounds = CGRect(x: 0, y: 0, width: 400, height: 200)
let view = MyView(frame: bounds)

XCPlaygroundPage.currentPage.liveView = view
view.flipIt() // Works if NSTimer > 0
//view.update() // Doesn't work.  Flips immediately