UILabel 向左或向右移动 Swift

UILabel moving left or right Swift

我已经通过自动布局和约束设置了 2 个文本。现在我想将文本 1 向右移动,将文本 2 向左移动,但它不起作用。两个文本都应该在视图的中心结束(水平)

@IBOutlet weak var Text1: UILabel!
@IBOutlet weak var Text2: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    UIView.animate(withDuration: 5, delay: 0, options: [.beginFromCurrentState],
                   animations: {
                    self.Text1.frame.origin.x += 300
                    self.Text2.frame.origin.x -= 300
                    self.view.layoutIfNeeded()
    }, completion: nil)
    // Do any additional setup after loading the view.
}

我在代码中做错了什么吗?

您需要使用标签的约束。

UIView.animate(withDuration: 5, delay: 0, options: [.beginFromCurrentState],
               animations: {


     //here modify constraints constant or may need to add some new constraints dynamically.

           //     self.Text1.frame.origin.x += 300
           //     self.Text2.frame.origin.x -= 300
           //     self.view.layoutIfNeeded()
}, completion: nil)

您可以使用 CGAffineTransform(translationX: y:) 实现类似的目的:

UIView.animate(withDuration: 1.0, delay: 0.0, options: .curveEaseInOut, animations: {
     self.breathingStatusLabel.transform = CGAffineTransform(translationX: self.breathingStatusLabel.bounds.origin.x + 300, y: self.breathingStatusLabel.bounds.origin.y)
}, completion: nil)

要将其移回原来的位置,请将其添加到另一个动画块中:

self.breathingStatusLabel.transform = .identity

注意: CGAffineTransform(translationX: y:) 将视图转换到提供的位置,但不会更改其框架。所以在使用它时要小心,只要动画标签就可以使用它。

但是例如你想在键盘出现时移动UITextFields,如果它的autolayout或者改变它的框架,你应该改变约束。如果你使用 CGAffineTransform(translationX: y:) 你会注意到它会移动 UITextField 但是当你点击它时没有任何效果因为它的框架没有改变,只是位置改变了。

@IBOutlet weak var Text1: UILabel!
@IBOutlet var Text1LeftConstrin:NSLayoutConstraint!
// (Connect this with your Text1 label left constrain)

@IBOutlet weak var Text2: UILabel!
@IBOutlet var Text1LeftConstrin:NSLayoutConstraint! 
//(Connect this with your Text1 label left constrain)

override func viewDidLoad() {
super.viewDidLoad()
UIView.animate(withDuration: 5, delay: 0, options: [.beginFromCurrentState],
               animations: {
                Text1.constant += 300
                Text2.constant -= 300
                self.view.layoutIfNeeded()
}, completion: nil)
// Do any additional setup after loading the view.
}
UIView.transition(with:self.yourLabel,
  duration: 5.0,
  options: [.autoreverse,.repeat],
  animations: {
    self.yourLabel.transform = CGAffineTransform(translationX: (-1 * (self.view.frame.size.width / 2) + 20), y:0)
    self.yourLabel.transform = CGAffineTransform(translationX: ((self.view.frame.size.width / 2) - 20), y:0)
  }, 
  completion: nil)