JPLabel(繼承UILabel)
@implementation JPLabel
-(void)layoutSubviews{
[superlayoutSubviews];
UIBezierPath*maskPath = [UIBezierPathbezierPathWithRoundedRect:CGRectMake(0,0,self.frame.size.width,self.frame.size.height)byRoundingCorners:UIRectCornerBottomRight|UIRectCornerTopRight?cornerRadii:CGSizeMake(self.frame.size.height*0.5,self.frame.size.height*0.5)];
CAShapeLayer*maskLayer = [[CAShapeLayeralloc]init];
maskLayer.frame=self.bounds;
maskLayer.path= maskPath.CGPath;
self.layer.mask= maskLayer;
}
@end
