当方向改变时，效果不适用（swift3）

Question

我只是想写代码，只有当设备倒置时标签 "dave" 才不会被隐藏。现在标签 "dave" 显示在所有 4 个方向上。这是我的代码。

import UIKit

class ViewController: UIViewController {

@IBOutlet var dave: UILabel!
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
    s()

}


func s() {
    if UIDevice.current.orientation == UIDeviceOrientation.landscapeLeft {
        dave.isHidden = true




    } else if UIDevice.current.orientation == UIDeviceOrientation.landscapeRight {
        dave.isHidden = true


    } else if UIDevice.current.orientation == UIDeviceOrientation.portrait {
        dave.isHidden = true


    } else if UIDevice.current.orientation == UIDeviceOrientation.portraitUpsideDown {
        dave.isHidden = false
    }}}

Answer 1

当您的设备方向发生变化时，viewWillTransition 该委托将触发。所以在这个方法中调用你的 S() 函数而不是 viewDidLoad.

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
        s()
}

希望对您有所帮助。

当方向改变时，效果不适用（swift3）

When Orientation is changed effects are not applied (swift3)

if-statement

orientation

ios

swift

swift3