UIButton * button =[UIButton buttonWithType:UIButtonTypeSystem];[self.view addSubview:button];//一定要先添加到视图上button.frame=CGRectMake(100,100,100,40);button.backgroundColor=[UIColor blueColor];UIBezierPath *maskPath=[UIBezierPath bezierPathWithRoundedRect:button.bounds byRoundingCorners:UIRectCornerTopRight|UIRectCornerBottomRight cornerRadii:CGSizeMake(10,10)];CAShapeLayer *maskLayer=[[CAShapeLayer alloc]init];
maskLayer.frame=button.bounds;
maskLayer.path=maskPath.CGPath;
button.layer.mask=maskLayer;
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