iOS开发设置view某几个角为圆角

    UIView *testview = [[UIView alloc] init];
    testview.layer.cornerRadius = 10；
    [self.view addSubview: testview];

 UIView *testview = [[UIView alloc] init];
    [self.view addSubview: testview];

    UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect: testview.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(10,10)];
    //创建 layer
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];
    maskLayer.frame = testview.bounds;
    //赋值
    maskLayer.path = maskPath.CGPath;
    testview.layer.mask = maskLayer;