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
最后，在iOS11中有CACornerMask ! 使用CACornerMask可以很容易地完成:
let view = UIView()
view.clipsToBounds = true
view.layer.cornerRadius = 10
view.layer.maskedCorners = [.layerMaxXMinYCorner, .layerMinXMinYCorner] // Top right corner, Top left corner respectively
其他回答
// Create the path (with only the top-left corner rounded)
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds
byRoundingCorners:(UIRectCornerBottomLeft | UIRectCornerBottomRight)
cornerRadii:CGSizeMake(7.0, 7.0)];
// Create the shape layer and set its path
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = cell.stripBlackImnageView.bounds;
maskLayer.path = maskPath.CGPath;
// Set the newly created shapelayer as the mask for the image view's layer
view.layer.mask = maskLayer;
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>
在Swift 4.2中，通过@IBDesignable创建它，如下所示:
@IBDesignable
class DesignableViewCustomCorner: UIView {
@IBInspectable var cornerRadious: CGFloat = 0 {
didSet {
let path = UIBezierPath(roundedRect: self.bounds, byRoundingCorners: [.topLeft, .topRight], cornerRadii: CGSize(width: cornerRadious, height: cornerRadious))
let mask = CAShapeLayer()
mask.path = path.cgPath
self.layer.mask = mask
}
}
}
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)
}
}
使用这个扩展设置角圆角和圆角边界
像这样使用:
override func viewWillLayoutSubviews() {
super.viewWillLayoutSubviews()
myView.roundCornersWithBorder(corners: [.topLeft, .topRight], radius: 8.0)
myView.roundCorners(corners: [.topLeft, .topRight], radius: 8.0)
}
extension UIView {
func roundCorners(corners: UIRectCorner, radius: CGFloat) {
let path = UIBezierPath(roundedRect: bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let mask = CAShapeLayer()
mask.path = path.cgPath
layer.mask = mask
}
func roundCornersWithBorder(corners: UIRectCorner, radius: CGFloat) {
let maskLayer = CAShapeLayer()
maskLayer.frame = bounds
maskLayer.path = UIBezierPath(roundedRect: bounds, byRoundingCorners: [.topLeft, .topRight], cornerRadii: CGSize(width: radius, height: radius)).cgPath
layer.mask = maskLayer
// Add border
let borderLayer = CAShapeLayer()
borderLayer.path = maskLayer.path // Reuse the Bezier path
borderLayer.fillColor = UIColor.clear.cgColor
borderLayer.strokeColor = UIColor(red:3/255, green:33/255, blue:70/255, alpha: 0.15).cgColor
borderLayer.lineWidth = 2
borderLayer.frame = bounds
layer.addSublayer(borderLayer)
}
}
