获取当前设备方向答案

【问题标题】：Get the current device orientation获取当前设备方向
【发布时间】：2017-01-15 09:27:53
【问题描述】：

我知道之前有人问过这个问题并尝试实施建议的解决方案，但它对我不起作用。也许我做错了。你有什么想法吗？

这是我的代码：

import UIKit

class ViewController: UIViewController {

@IBOutlet weak var test: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    test.backgroundColor = UIColor.darkGray
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated) // No need for semicolon

    func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
        if UIDevice.current.orientation.isLandscape {
            test.backgroundColor = UIColor.purple
        } else {
            test.backgroundColor = UIColor.blue
        }
      }
    }
 }

【问题讨论】：

How to get current orientation of device programatically in iOS 6?的可能重复
我尝试遵循这些建议，但在我的情况下无法实施。

标签： ios swift uiviewcontroller uidevice

【解决方案1】：

你有嵌套的函数——那是行不通的。改成这样：

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated) // No need for semicolon
}
override func viewWillTransitionToSize(size: CGSize, withTransitionCoordinator coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    if UIDevice.current.orientation.isLandscape {
        test.backgroundColor = UIColor.purple
    } else {
        test.backgroundColor = UIColor.blue
    }
}

事实上，您可以使用您显示的代码摆脱对 viewWillLayoutSubviews 的覆盖。

【讨论】：

【解决方案2】：

** 对于那些需要额外帮助的人，请参阅下面的建议 ** 此函数将在大小更改之前调用，但您会从参数中知道它

Swift 3.x +

override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    if UIDevice.current.orientation.isLandscape {
        //Landscape

            print("before transition")
            print("w "+"\(width)")
            print("h "+"\(height)")
            print("to size")
            print("w "+"\(size.width)")
            print("h "+"\(size.height)")

    } else {
        //Portrait      

            print("before transition")
            print("w "+"\(width)")
            print("h "+"\(height)")
            print("to size")
            print("w "+"\(size.width)")
            print("h "+"\(size.height)")

    }

}

【讨论】：