iOS开发设置View某个角为圆角

需要借助UIBezierPath与CAShapeLayer进行实现

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
view.backgroundColor = [UIColor redColor];
[self.view addSubview:view];
UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(20, 20)];
CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
maskLayer.frame = view.bounds;
maskLayer.path = maskPath.CGPath;
view.layer.mask = maskLayer;

通过枚举类型UIRectCorner选择上下左右

typedef NS_OPTIONS(NSUInteger, UIRectCorner) {
            UIRectCornerTopLeft = 1 << 0,
            UIRectCornerTopRight = 1 << 1,
            UIRectCornerBottomLeft = 1 << 2,
            UIRectCornerBottomRight = 1 << 3,
            UIRectCornerAllCorners = ~0UL
            
        };

UILabel设置圆角可能出现问题

如果Uilabel设置圆角，在分辨率高的手机可能出现一条细线，因为label的宽度不是整数，取整数即可。

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)]; view.backgroundColor = [UIColor redColor]; [self.view addSubview:view]; UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(20, 20)]; CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init]; maskLayer.frame = view.bounds; maskLayer.path = maskPath.CGPath; view.layer.mask = maskLayer;

作者：薄凉_简书
链接：https://www.jianshu.com/p/867124573ab0
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)]; view.backgroundColor = [UIColor redColor]; [self.view addSubview:view]; UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(20, 20)]; CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init]; maskLayer.frame = view.bounds; maskLayer.path = maskPath.CGPath; view.layer.mask = maskLayer;

作者：薄凉_简书
链接：https://www.jianshu.com/p/867124573ab0
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)]; view.backgroundColor = [UIColor redColor]; [self.view addSubview:view]; UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(20, 20)]; CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init]; maskLayer.frame = view.bounds; maskLayer.path = maskPath.CGPath; view.layer.mask = maskLayer;

作者：薄凉_简书
链接：https://www.jianshu.com/p/867124573ab0
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)]; view.backgroundColor = [UIColor redColor]; [self.view addSubview:view]; UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(20, 20)]; CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init]; maskLayer.frame = view.bounds; maskLayer.path = maskPath.CGPath; view.layer.mask = maskLayer;

作者：薄凉_简书
链接：https://www.jianshu.com/p/867124573ab0
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)]; view.backgroundColor = [UIColor redColor]; [self.view addSubview:view]; UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(20, 20)]; CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init]; maskLayer.frame = view.bounds; maskLayer.path = maskPath.CGPath; view.layer.mask = maskLayer;

作者：薄凉_简书
链接：https://www.jianshu.com/p/867124573ab0
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。

UIView *view = [[UIView alloc] initWithFrame:CGRectMake(100, 100, 100, 100)]; view.backgroundColor = [UIColor redColor]; [self.view addSubview:view]; UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(20, 20)]; CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init]; maskLayer.frame = view.bounds; maskLayer.path = maskPath.CGPath; view.layer.mask = maskLayer;

作者：薄凉_简书
链接：https://www.jianshu.com/p/867124573ab0
來源：简书
简书著作权归作者所有，任何形式的转载都请联系作者获得授权并注明出处。