1 // UIView.transition
2
3 // 1、可以设置从一个View到另一个View的转场动画
4 // UIView.transition(from: <#T##UIView#>, to: <#T##UIView#>, duration: <#T##TimeInterval#>, options: <#T##UIViewAnimationOptions#>, completion: <#T##((Bool) -> Void)?##((Bool) -> Void)?##(Bool) -> Void#>)
5
6 // 2、可以设置一个View的动画(比如翻转)
7 // UIView.transition(with: <#T##UIView#>, duration: <#T##TimeInterval#>, options: <#T##UIViewAnimationOptions#>, animations: <#T##(() -> Void)?##(() -> Void)?##() -> Void#>, completion: <#T##((Bool) -> Void)?##((Bool) -> Void)?##(Bool) -> Void#>)
8
9 import UIKit
10
11 class ViewController: UIViewController {
12
13 private var isZhengMian:Bool = true
14
15 override func viewDidLoad() {
16 super.viewDidLoad()
17 }
18
19 @IBAction func btnClick(_ sender: UIButton) {
20 isZhengMian = !isZhengMian
21 if isZhengMian{ // 正面，带文字，从左向右翻转
22 UIView.transition(with: sender, duration: 0.5, options: UIViewAnimationOptions.transitionFlipFromLeft, animations: {
23 sender.setTitle("✓", for: .normal)
24 }, completion: { (_) in
25
26 })
27 } else{ // 反面，不带文字，从右向左翻转
28 UIView.transition(with: sender, duration: 0.5, options: UIViewAnimationOptions.transitionFlipFromRight, animations: {
29 sender.setTitle(nil, for: .normal)
30 }, completion: { (_) in
31
32 })
33 }
34 }
35 }
