视图的层次结构(二)
@"test:%@",view2.superview);
//6.tag：视图的标签值
//如果想通过tag得到视图，tag设置大于等于100
/*
注意点：1：在同一个父视图上面，两个子视图不能设置相同的tag
2:可以用父视图的父视图找子视图，理解查找机制
*/
superView.tag = 100;
view2.tag = 101;
//7.开启多点触摸
superView.multipleTouchEnabled = YES;
//8.开启响应触摸事件
superView.userInteractionEnabled = NO;
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.backgroundColor = [UIColor redColor];
button.frame = CGRectMake(90, 90, 90, 90);
[button addTarget:self action:@selector(buttonAction) forControlEvents:UIControlEventTouchUpInside];
[superView addSubview:button];
UIView *view3 = [[UIView alloc] initWithFrame:CGRectMake(0, 290, 40, 40)];
view3.backgroundColor = [UIColor blueColor];
[superView addSubview:view3];
/*
clipsToBounds设置为yes后，会将超过父视图的子视图部分截取
*/
superView.clipsToBounds = YES;
[view3 release];
/*__________________________UIView的内存管理___________________________*/
TestView *testView = [[TestView alloc] initWithFrame:CGRectMake(0, 400, 320, 60)];
testView.backgroundColor = [UIColor cyanColor];
NSLog(@"testView:%d",testView.retainCount);
[self.window addSubview:testView];
NSLog(@"testView:%d",testView.retainCount);
[testView release]; //1
NSLog(@"testView:%d",testView.retainCount);
//从父视图上移除，被释放
[testView removeFromSuperview];
return YES;
}
- (void)buttonAction
{
NSLog(@"buttonAction");
}
//程序进入后台
- (void)applicationDidEnterBackground:(UIApplication *)application
{
//通过tag值取得视图
// UIView *view = [self.window viewWithTag:100];
// view.backgroundColor = [UIColor redColor];
UIView *view = [self.window viewWithTag:101];
view.backgroundColor = [UIColor orangeColor];
}
@end