在 Swift iOS 中单击按钮将视图移动到另一个视图

Question

我在制作的应用程序中偶然发现了一个问题。我需要在单击按钮时以编程方式将一个视图放入另一个视图。

现在我需要通过动画单击按钮将视图 1 移动到视图 2 的中心。我试图将 View1 重新定位到 View 2，但我无法正确完成。

这是我想要达到的最终结果。

创建红色视图的代码

    My.cellSnapshot  = snapshopOfCell(cell)
            var center = cell.center
            My.cellSnapshot!.center = center
            My.cellSnapshot!.alpha = 0.0
            ingredientsTableView.addSubview(My.cellSnapshot!)


func snapshopOfCell(inputView: UIView) -> UIView {
            UIGraphicsBeginImageContextWithOptions(inputView.bounds.size, false, 0.0)
            inputView.layer.renderInContext(UIGraphicsGetCurrentContext()!)
            let image = UIGraphicsGetImageFromCurrentImageContext() as UIImage
            UIGraphicsEndImageContext()
            let cellSnapshot : UIView = UIImageView(image: image)
            cellSnapshot.layer.masksToBounds = false
            cellSnapshot.layer.cornerRadius = 0.0
            cellSnapshot.layer.shadowOffset = CGSizeMake(-5.0, 0.0)
            cellSnapshot.layer.shadowRadius = 5.0
            cellSnapshot.layer.shadowOpacity = 0.4
            return cellSnapshot
        }

请帮我解决问题。

提前致谢

Answer 1

我创建了一个示例项目并设置了一个目标视图以及一个用于在故事板中启动动画的按钮，如下所示：

然后在代码中我添加了要移动的视图和按钮目标代码，如下所示：

var sourceView: UIView!
@IBOutlet weak var destinationView: UIView!

var sourceViewPositioningConstraints = [NSLayoutConstraint]()

override func viewDidLoad() {
    super.viewDidLoad()

    sourceView = UIView()
    sourceView?.backgroundColor = UIColor.redColor()

    sourceView?.translatesAutoresizingMaskIntoConstraints = false
    view.addSubview(sourceView)

    // size constraints
    NSLayoutConstraint(item: sourceView, attribute: .Width, relatedBy: .Equal, toItem: view, attribute: .Width, multiplier: 0.25, constant: 0).active = true
    NSLayoutConstraint(item: sourceView, attribute: .Width, relatedBy: .Equal, toItem: sourceView, attribute: .Height, multiplier: 16/9, constant: 0).active = true

    // positioning constraints
    sourceViewPositioningConstraints += [NSLayoutConstraint(item: sourceView, attribute: .Top, relatedBy: .Equal, toItem: topLayoutGuide, attribute: .BottomMargin, multiplier: 1, constant: 0)]
    sourceViewPositioningConstraints += [NSLayoutConstraint(item: sourceView, attribute: .CenterX, relatedBy: .Equal, toItem: view, attribute: .CenterX, multiplier: 1, constant: 0)]
    NSLayoutConstraint.activateConstraints(sourceViewPositioningConstraints)
}

@IBAction func move(sender: UIButton) {
    // deactivate current positioning constraints
    NSLayoutConstraint.deactivateConstraints(sourceViewPositioningConstraints)
    sourceViewPositioningConstraints.removeAll()

    // add new positioning constraints
    sourceViewPositioningConstraints += [NSLayoutConstraint(item: sourceView, attribute: .CenterX, relatedBy: .Equal, toItem: destinationView, attribute: .CenterX, multiplier: 1, constant: 0)]
    sourceViewPositioningConstraints += [NSLayoutConstraint(item: sourceView, attribute: .CenterY, relatedBy: .Equal, toItem: destinationView, attribute: .CenterY, multiplier: 1, constant: 0)]
    NSLayoutConstraint.activateConstraints(sourceViewPositioningConstraints)

    // animate constraint changes
    UIView.animateWithDuration(1) {
        self.view.layoutIfNeeded()
    }
}

如果您不为您的可移动视图使用自动布局，您可以简单地使用这样的东西：

override func viewDidLoad() {
    super.viewDidLoad()

    sourceView = UIView()
    sourceView?.backgroundColor = UIColor.redColor()
    sourceView.frame = CGRect(x: 40, y: 40, width: 100, height: 100)
    view.addSubview(sourceView)

}

@IBAction func move(sender: UIButton) {
    // animate constraint changes
    UIView.animateWithDuration(1) {
        self.sourceView.center = self.destinationView.center
    }
}

Answer 2

您可以移动视图0.5秒。

UIView.animateWithDuration(0.5, delay: 0.0, options: UIViewAnimationOptions.CurveEaseOut, animations: { 
redView.center = greenView.center 
}, completion: nil)

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