使用
Swift 3后如何检测方向变化？
我需要在更改后检测它以计算帧大小.
编辑：
我问了这个问题,因为我需要重新定位方向更改的视图,就像这个问题：Can’t get background gradient to fill entire screen upon rotation
我不知道如何实现标记为正确答案的答案.
我尝试了另一个答案
self.backgroundImageView.layer.sublayers?.first?.frame = self.view.bounds
但它不起作用.
在viewDidLoad()中我有
let color1 = UIColor(red: 225.0/255.0,green: 210.0/255.0,blue: 0.0/255.0,alpha: 1.0).cgColor
let color2 = UIColor(red: 255.0/255.0,green: 125.0/255.0,blue: 77.0/255.0,alpha: 1.0).cgColor
let gradientLayer = CAGradientLayer()
gradientLayer.colors = [color1,color2]
gradientLayer.locations = [ 0.0,1.0]
gradientLayer.frame = self.view.bounds
self.view.layer.insertSublayer(gradientLayer,at: 0)
解决方法
上面接受的答案在转换之前返回帧大小.所以你的视图没有更新.你需要在转换完成后获得帧大小.
override func viewWillTransition(to size: CGSize,with coordinator: UIViewControllerTransitionCoordinator) {
coordinator.animate(alongsideTransition: { (UIViewControllerTransitionCoordinatorContext) -> Void in
let orient = UIApplication.shared.statusBarOrientation
switch orient {
case .portrait:
print("Portrait")
case .landscapeLeft,.landscapeRight :
print("Landscape")
default:
print("Anything But Portrait")
}
},completion: { (UIViewControllerTransitionCoordinatorContext) -> Void in
//refresh view once rotation is completed not in will transition as it returns incorrect frame size.Refresh here
})
super.viewWillTransition(to: size,with: coordinator)
}
