有没有办法为一个UIView的左上角和右上角设置角半径?
我尝试了下面的方法，但最终它再也看不到视图了。
UIView *view = [[UIView alloc] initWithFrame:frame];
CALayer *layer = [CALayer layer];
UIBezierPath *shadowPath = [UIBezierPath bezierPathWithRoundedRect:frame byRoundingCorners:(UIRectCornerTopLeft|UIRectCornerTopRight) cornerRadii:CGSizeMake(3.0, 3.0)];
layer.shadowPath = shadowPath.CGPath;
view.layer.mask = layer;
当前回答
下面是@JohnnyRockex的Swift版本的回答
extension UIView {
func roundCorners(_ corners: UIRectCorner, radius: CGFloat) {
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let mask = CAShapeLayer()
mask.path = path.cgPath
self.layer.mask = mask
}
}
view.roundCorners([.topLeft, .bottomRight], radius: 10)
Note
如果你正在使用自动布局，你需要子类化你的UIView，并在视图的layoutSubviews中调用roundCorners以获得最佳效果。
class View: UIView {
override func layoutSubviews() {
super.layoutSubviews()
self.roundCorners([.topLeft, .bottomLeft], radius: 10)
}
}
其他回答
最简单的方法是用圆角层做一个蒙版。
CALayer *maskLayer = [CALayer layer];
maskLayer.frame = CGRectMake(0,0,maskWidth ,maskHeight);
maskLayer.contents = (__bridge id)[[UIImage imageNamed:@"maskImageWithRoundedCorners.png"] CGImage];
aUIView.layer.mask = maskLayer;
别忘了:
#import <QuartzCore/QuartzCore.h>
只查看toppleft和TopRight角半径
lazy var footerBackgroundView: UIView = {
let view = UIView()
view.translatesAutoresizingMaskIntoConstraints = false
view.backgroundColor = .blue
//Make Corners Radius TopLeft & Top Right
view.clipsToBounds = true
view.layer.cornerRadius = 8
view.layer.maskedCorners = [.layerMaxXMinYCorner, .layerMinXMinYCorner]
return view
}()
一个可爱的扩展重用尤努斯Nedim Mehel解决方案
斯威夫特2.3
extension UIView {
func roundCornersWithLayerMask(cornerRadii: CGFloat, corners: UIRectCorner) {
let path = UIBezierPath(roundedRect: bounds,
byRoundingCorners: corners,
cornerRadii: CGSize(width: cornerRadii, height: cornerRadii))
let maskLayer = CAShapeLayer()
maskLayer.path = path.CGPath
layer.mask = maskLayer
} }
使用
let view = UIView()
view.roundCornersWithLayerMask(10,[.TopLeft,.TopRight])
Swift代码示例:https://stackoverflow.com/a/35621736/308315
不直接。你必须:
创建一个CAShapeLayer 根据视图将其路径设置为CGPathRef。边界，但只有两个圆角(可能通过使用+[UIBezierPath bezierPathWithRoundedRect:byRoundingCorners:cornerRadii:]) 设置你的view.layer.mask为CAShapeLayer
一种编程的方法是创建一个UIView在UIView顶部有圆角的部分。或者你可以把顶部藏在什么东西下面。
