UIView操作：插入添加置顶，判断一个视图是否为子视图view

for (int>0;>3; i++) {

UIView *v = [[UIView
alloc] initWithFrame:CGRectMake(30*i,
30*i+50,
80, 80)];

v.backgroundColor =[[UIColor
alloc] initWithRed:arc4random()%256/255.0
green:arc4random()%256/255.0
blue:arc4random()%256/255.0
alpha:arc4random()%1001/999.0];

[self.window
addSubview:v];

[v
release];

}

UIView *v =[[UIView
alloc] initWithFrame:CGRectMake(20,
20,
20, 80)];

v.backgroundColor =[UIColor
yellowColor];

//插入子视图 index就是数组的下标
（实际上是在self.window.subview
视图中添加子视图）

[self.window
insertSubview:v atIndex:1];

//插入子视图
放在某视图上面

UIView *v1 =[[UIView
alloc] initWithFrame:CGRectMake(40,
20,
20, 70)];

v1.backgroundColor = [UIColor
orangeColor];

[self.window
insertSubview:v1 aboveSubview:self.window.subviews[2]];

//插入子视图
放在某视图下面

UIView *v2 =[[UIView
alloc] initWithFrame:CGRectMake(0,
20,
20, 100)];

v2.backgroundColor = [UIColor
greenColor];

[self.window
insertSubview:v2 belowSubview:self.window.subviews[0]];

//把某视图置顶（不进行插入）调用完毕后
该视图在最顶层

[self.window
bringSubviewToFront:self.window.subviews[3]];

//把某视图置底（不进行插入）调用完毕后
盖世兔在最底层

[self.window
sendSubviewToBack:self.window.subviews[5]];

//某视图交换位置后
索引值也会发生变化

//把某个视图调换位置

[self.window
exchangeSubviewAtIndex:0
withSubviewAtIndex:4];

//判断视图是否是另一个视图的子视图

NSLog(@"%d",[self.window.subviews[0]
isDescendantOfView:self.window]);