Ios iPhone 6s上放错了CAGradientLayer
我有一些带有彩色背景的Ios iPhone 6s上放错了CAGradientLayer,ios,objective-c,iphone,cagradientlayer,Ios,Objective C,Iphone,Cagradientlayer,我有一些带有彩色背景的ui标签,我向它们添加了CAGradientLayers,如下所示 CAGradientLayer * gradientLayer = [CAGradientLayer layer]; gradientLayer.colors = [NSArray arrayWithObjects: (id) [UIColor colorWithWhite:1 alpha:0.3].CGColor,
ui标签
,我向它们添加了CAGradientLayers
,如下所示
CAGradientLayer * gradientLayer = [CAGradientLayer layer];
gradientLayer.colors = [NSArray arrayWithObjects:
(id) [UIColor colorWithWhite:1 alpha:0.3].CGColor,
(id) [UIColor colorWithWhite:0.5 alpha:0.3].CGColor, nil];
gradientLayer.frame = label.bounds;
gradientLayer.cornerRadius = label.layer.cornerRadius;
[label.layer insertSublayer:gradientLayer atIndex:0];
在iPhone4和iPhone5S上,它看起来很完美,但在iPhone6S上,CAGradientLayers
水平放置错误,如下图所示
UIButtons也会出现这个问题
我正在运行iOS 9.3 您需要的是处理自动布局约束。此swift代码表示在
viewdilayoutsubviews
方法中需要执行的操作:
class ViewController: UIViewController {
@IBOutlet weak var button: UIButton!
let gradientLayer = CAGradientLayer()
override func viewDidLoad() {
super.viewDidLoad()
gradientLayer.colors = [UIColor(white: 1, alpha: 0.3).CGColor,
UIColor(white: 0.5, alpha: 0.3).CGColor]
gradientLayer.frame = button.bounds
gradientLayer.cornerRadius = button.layer.cornerRadius
button.layer.insertSublayer(gradientLayer, atIndex: 0)
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
gradientLayer.frame = button.bounds
}
}
代码放在视图/视图控制器生命周期的何处?如果标签和按钮的框架发生变化,则渐变层需要随之变化。例如,如果使用“自动布局”布局标签,并且旋转视图,则需要更新渐变的框架。您可以在视图控制器上的
viewdilayoutsubviews
中执行此操作,或者使用渐变对标签/按钮进行子类化,并在layoutSubviews
@beyowulf中更新渐变帧,如果代码在viewdiload方法中。@keithbhunter标签和按钮不会更改,这是一个仅用于肖像的应用程序。我不需要将渐变层添加到按钮中吗?