IOS开发之为视图绘制单(多)个圆角实例代码

//Core RaduiasUIView *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;

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