IOS开发之为视图绘制单(多)个圆角实例代码

//Core Raduias

UIView *actionView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)];

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:actionView.bounds byRoundingCorners:UIRectCornerTopRight | UIRectCornerBottomRight cornerRadii:CGSizeMake(20, 20)];

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

maskLayer.frame = actionView.bounds;

maskLayer.path = maskPath.CGPath;

actionView.layer.mask = maskLayer;

typedefNS_OPTIONS(NSUInteger, UIRectCorner) {

  UIRectCornerTopLeft   = 1 << 0,

  UIRectCornerTopRight  = 1 << 1,

  UIRectCornerBottomLeft = 1 << 2,

  UIRectCornerBottomRight = 1 << 3,

  UIRectCornerAllCorners = ~0UL

};