文章转自：https://www.jianshu.com/p/f2482a9f45c2

一、概念

/**

UIView 的左上角和右上角为圆角

UIButton左上角和右上角圆角

注意:直接拷贝方法直接可以使用

CSDN:https://blog.csdn.net/shihuboke/article/details/82083432

*/

二、UIView 的左上角和右上角为圆角

效果图:

                                                  UIView 的左上角和右上角为圆角

声明:

@property(nonatomic,strong) UIView *platFormRadiusView;

- (void)viewDidLoad {

    [super viewDidLoad];

    self.title = @"左上和右上为圆角";

    [self platFormRadiusView];

}

实现:

-(UIView *)platFormRadiusView{

    if (!_platFormRadiusView) {

        _platFormRadiusView = [[UIView alloc] init];

        _platFormRadiusView.backgroundColor = [UIColor redColor];

        _platFormRadiusView.frame = CGRectMake(0, 100,self.view.frame.size.width , 200);

        [self.view addSubview:_platFormRadiusView];

        // 左上和右上为圆角

        UIBezierPath *cornerRadiusPath = [UIBezierPath bezierPathWithRoundedRect:_platFormRadiusView.bounds byRoundingCorners:UIRectCornerTopRight | UIRectCornerTopLeft cornerRadii:CGSizeMake(15, 15)];

        CAShapeLayer *cornerRadiusLayer = [ [CAShapeLayer alloc ] init];

        cornerRadiusLayer.frame = _platFormRadiusView.bounds;

        cornerRadiusLayer.path = cornerRadiusPath.CGPath; _platFormRadiusView.layer.mask = cornerRadiusLayer;

    }

    return _platFormRadiusView;

}

三、UIButton 的左上角和右上角为圆角

效果图:

                                               UIButton 的左上角和右上角为圆角

- (void)viewDidLoad {

    [super viewDidLoad];

    self.title = @"Button左上和右上为圆角";

    [self platFormRadiusButton];

}

实现:

-(void)platFormRadiusButton{

    UIButton *shButton = [UIButton buttonWithType:UIButtonTypeCustom];

    shButton.frame = CGRectMake(0, 100, self.view.frame.size.width, 200);

    shButton.backgroundColor = [UIColor redColor];

    [shButton setTitle:@"石虎测试Button" forState:0];

    shButton.tag = 1;

    [self.view addSubview:shButton];

    //设置圆角

 UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:shButton.bounds byRoundingCorners:UIRectCornerTopRight | UIRectCornerTopLeft cornerRadii:CGSizeMake(15, 15)];

    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

    maskLayer.frame = shButton.bounds;

    maskLayer.path = maskPath.CGPath;

    shButton.layer.mask = maskLayer;

}