UIView之常用属性

1.    view.tag = 200; // 系统保留0～100
2.    view.frame = CGRectMake(20, 30, 300, 300);
3.    view.center = self.view.center;
4.    view.backgroundColor = [UIColor redColor];
5.    // 用户交互
6.    view.userInteractionEnabled = YES; // 默认为YES

1.// 旋转
2.    view.transform = CGAffineTransformRotate(view.transform, M_PI_4);
3.//    view.transform = CGAffineTransformMakeRotation(M_PI_4);
4.//    view.transform = CGAffineTransformIdentity; // 对transform变换后恢复原状

1.    // 平移
2.    view.transform = CGAffineTransformMakeTranslation(-100, 50);

1.    // 缩放
2.    view.transform = CGAffineTransformMakeScale(0.5, 0.2);

1.    // layer图层，可用于设置圆角、阴影效果
2.    view.layer.cornerRadius = 20; // 圆角

1.    UIView *v = [[UIView alloc] init];
2.    v.frame = CGRectMake(280, 280, 50, 50);
3.    v.backgroundColor = [UIColor brownColor];
4.    [view addSubview:v];
5.    // 裁剪掉子视图超出父视图的部分
6.    view.clipsToBounds = YES;

裁剪前

裁剪后