UIView 设置指定几个角为圆角

//初始化UIView

    UIView * view = [UIView alloc]initWithFrame:CGRectMake(0,0,[UIScreen mainScreen].bounds.size.width,[UIScreen mainScreen].bounds.size.height)];

[view setBackgroundColor:[UIColor White]];

[self.view addSubview:view];

//设置view左侧上UIRectCornerTopLeft 和 左侧下UIRectCornerBottomLeft为5的圆角

UIBezierPath * path = [UIBezierPath bezierPathWithRoundedRect:view.bounds byRoundingCorners:UIRectCornerTopLeft|UIRectCornerBottomLeft cornerRadii:CGSizeMake(5, 5)];

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

layer.frame = view.bounds;

layer.path = path.CGPath;

view.layer.mask = layer;

//设置view 全部角为圆角

viewT.layer.cornerRadius = 10;//设置那个圆角大小

viewT.layer.masksToBounds = YES;//设置YES是保证添加的图片覆盖视图的效果