UIView : NSObject
frame center bounds
frame 相对于父视图
center 相对于父视图 (CGPoint)point;
bounds 相对于视图本身
//设置view的center属性
- (void)setCenter:(CGPoint)point;//设置view的center属性,会改变视图的frame
- (void)insertSubview:(UIView *)view atIndex:(NSInteger)index;//在父视图上添加一个子视图,index为子视图在父视图上所处的位置,从0开始.
- (void)exchangeSubviewAtIndex:(NSInteger)index1 withSubviewAtIndex:(NSInteger)index2;//交换父视图上指定位置的两个子视图的位置
- (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview;//在某个子视图的下面添加一个新的子视图,即新添加的视图会被siblingSubview覆盖
- (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview;//在某个子视图上面添加一个新的子视图,即新添加的子视图会覆盖siblingSubview视图
//clipsToBounds:调用主体是父视图,如下所示,view2超过view1的边界部分,会被自动剪裁掉
view1.clipsToBounds = YES;
[view1 addSubview:view2];
[view2 release];
//给view设置动画效果
[UIViewbeginAnimations:nilcontext:nil];
[UIViewsetAnimationDuration:0.5];//设置动画时间
[UIViewsetAnimationTransition:arc4random()%5forView:view cache:YES];//设置动画效果随机
//对UIView做操作
[UIViewcommitAnimations];//提交动画
//将view从父视图中移除
[view removeFromSuperview];
[view release];
removeFromSuperview:解除view在某个窗口中的关系链,同时将view从其父视图中移除,但是view的引用计数不会减1,所以需要在调用removeFromSuperview方法后将其引用计数减一,防止内存泄露.
- (BOOL)isDescendantOfView:(UIView *)view;//判断某个视图是否是view的子视图
//Returns a Boolean value indicating whether the receiver is a subview of a given view or identical to that view.