我需要在Swift中创建一个只有两个圆角的矩形（也可以使用Objective C代码）。
目前我的代码正在创建两个矩形
CGPathCreateWithRoundedRect(CGRectMake(0, 0, 30, 60), 5, 5, nil);
并且
CGPathCreateWithRoundedRect(CGRectMake(0, 0, 30, 60), 0, 0, nil);
我想把它们合并在一起（拥有两个直角和两个圆角），但我对代码不满意，我相信应该有更好的方法来完成它。
我是iOS和图形开发以及Swift方面的新手。
extension CACornerMask {
public static var leftBottom : CACornerMask { get { return .layerMinXMaxYCorner}}
public static var rightBottom : CACornerMask { get { return .layerMaxXMaxYCorner}}
public static var leftTop : CACornerMask { get { return .layerMaxXMinYCorner}}
public static var rightTop : CACornerMask { get { return .layerMinXMinYCorner}}
}
extension CALayer {
func roundCorners(_ mask:CACornerMask,corner:CGFloat) {
self.maskedCorners = mask
self.cornerRadius = corner
}
}
self.viewBack.layer.roundCorners([.leftBottom,.rightBottom], corner: 23)
Swift 5：用于左上角和右上角的圆角。
yourView.layer.cornerRadius = 12
yourView.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMinYCorner]
extension UIView {
func roundCorners(_ corners: UIRectCorner, radius: Double) {
let maskPath = UIBezierPath(roundedRect: bounds, byRoundingCorners: corners, cornerRadii: CGSize(width: radius, height: radius))
let shape = CAShapeLayer()
shape.path = maskPath.cgPath
layer.mask = shape
}
}
view.roundCorners([.topRight, .bottomRight], radius: 10)
这里是所有角落的值：
view.layer.cornerRadius = 10.0
view.layer.maskedCorners = [.layerMinXMinYCorner, .layerMaxXMaxYCorner, .layerMinXMaxYCorner]
Best way to do it!
iWasRobbed的答案的Objective-C版本：
UIView+RoundCorners.h
#import <UIKit/UIKit.h>
@interface UIView (RoundCorners)
/**
Rounds the given set of corners to the specified radius
- parameter corners: Corners to round
- parameter radius: Radius to round to
*/
- (void)roundCorners:(UIRectCorner)corners radius:(CGFloat)radius;
/**
Rounds the given set of corners to the specified radius with a border
- parameter corners: Corners to round
- parameter radius: Radius to round to
- parameter borderColor: The border color
- parameter borderWidth: The border width
*/
- (void)roundCorners:(UIRectCorner)corners radius:(CGFloat)radius borderColor:(UIColor *)borderColor borderWidth:(CGFloat)borderWidth;
/**
Fully rounds an autolayout view (e.g. one with no known frame) with the given diameter and border
- parameter diameter: The view's diameter
- parameter borderColor: The border color
- parameter borderWidth: The border width
*/
- (void)fullyRoundWithDiameter:(CGFloat)diameter borderColor:(UIColor *)borderColor borderWidth:(CGFloat)borderWidth;
@end
UIView+RoundCorners.m
#import "UIView+RoundCorners.h"
@implementation UIView (RoundCorners)
- (void)roundCorners:(UIRectCorner)corners radius:(CGFloat)radius {
[self _roundCorners:corners radius:radius];
}
- (void)roundCorners:(UIRectCorner)corners radius:(CGFloat)radius borderColor:(UIColor *)borderColor borderWidth:(CGFloat)borderWidth {
CAShapeLayer *mask = [self _roundCorners:corners radius:radius];
[self addBorderWithMask:mask borderColor:borderColor borderWidth:borderWidth];
}
- (void)fullyRoundWithDiameter:(CGFloat)diameter borderColor:(UIColor *)borderColor borderWidth:(CGFloat)borderWidth {
self.layer.masksToBounds = YES;
self.layer.cornerRadius = diameter / 2;
self.layer.borderWidth = borderWidth;
self.layer.borderColor = borderColor.CGColor;
}
- (CAShapeLayer *)_roundCorners:(UIRectCorner)corners radius:(CGFloat)radius {
UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:self.bounds byRoundingCorners:corners cornerRadii:CGSizeMake(radius, radius)];
CAShapeLayer *mask = [CAShapeLayer layer];
mask.path = path.CGPath;
self.layer.mask = mask;
return mask;
}
- (void)addBorderWithMask:(CAShapeLayer *)mask borderColor:(UIColor *)borderColor borderWidth:(CGFloat)borderWidth {
CAShapeLayer *borderLayer = [CAShapeLayer layer];
borderLayer.path = mask.path;
borderLayer.fillColor = UIColor.clearColor.CGColor;
borderLayer.strokeColor = borderColor.CGColor;
borderLayer.lineWidth = borderWidth;
borderLayer.frame = self.bounds;
[self.layer addSublayer:borderLayer];
}
@end
现在编写以下代码以创建红色视图。
self.myView.layer.cornerRadius = 15
请确保您不要编写任何代码，如 clipsToBounds = true 或 masksToBounds = true 。
下面的图片是结果
黄色视图的放置位置将决定哪两个角不会被圆角化。希望这很容易实现。
bezierPathWithRoundedRect:byRoundingCorners:cornerRadii:该方法是UIBezierPath类的一个类方法，用于创建一个带有圆角的矩形路径。它需要四个参数：矩形的大小、要圆角的角落、以及每个角落的半径。 - matt