Subview的一些用法

//添加一个子控件(可以将子控件插入到subviews数组中index这个位置)

• (void)insertSubview:(UIView *)view atIndex:(NSInteger)index;

//交换subviews数组中所存放子控件的位置

• (void)exchangeSubviewAtIndex:(NSInteger)index1 withSubviewAtIndex:(NSInteger)index2;

//添加一个子控件(新添加的控件默认都在subviews数组的后面,新添加的控件默认都显示在最上面\最顶部)

• (void)addSubview:(UIView *)view;

//添加一个子控件view(被挡在siblingSubview的下面)

• (void)insertSubview:(UIView *)view belowSubview:(UIView *)siblingSubview;

//添加一个子控件view(盖在siblingSubview的上面)

• (void)insertSubview:(UIView *)view aboveSubview:(UIView *)siblingSubview;

//将某个子控件拉到最上面(最顶部)来显示

• (void)bringSubviewToFront:(UIView *)view;

//将某个子控件拉到最下面(最底部)来显示

• (void)sendSubviewToBack:(UIView *)view;

/系统自动调用(留给子类去实现)/

• (void)didAddSubview:(UIView *)subview;
• (void)willRemoveSubview:(UIView *)subview;
• (void)willMoveToSuperview:(UIView *)newSuperview;
• (void)didMoveToSuperview;
• (void)willMoveToWindow:(UIWindow *)newWindow;
• (void)didMoveToWindow;

/系统自动调用///是不是view的子控件或者子控件的子控件(是否为view的后代)

• (BOOL)isDescendantOfView:(UIView *)view;

//通过tag获得对应的子控件(也可以或者子控件的子控件)

• (UIView *)viewWithTag:(NSInteger)tag;

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