当按下主页按钮时视图原点改变了吗？

Question

我在viewDidLoad中有以下代码：

[self.navigationController setNavigationBarHidden:YES];
    self.edgesForExtendedLayout = UIRectEdgeNone;
    self.view.autoresizingMask = UIViewAutoresizingFlexibleHeight;
    self.view.backgroundColor = [UIColor whiteColor];


    //we need to add white background behind the status bar
    CGFloat statusBarHeight = [UIApplication sharedApplication].statusBarFrame.size.height;
    UIView* statusBarWhiteBackGround = [[UIView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, statusBarHeight)];
    [statusBarWhiteBackGround setBackgroundColor:[UIColor whiteColor]];
    [self.view addSubview:statusBarWhiteBackGround];

    UIView * redBackGroundColor  = [[UIView alloc] init];
    [redBackGroundColor setBackgroundColor:[UIColor redColor]];
    redBackGroundColor.frame =CGRectMake(0,statusBarHeight , self.view.frame.size.width, self.view.frame.size.height-statusBarHeight);
    [self.view addSubview:redBackGroundColor];

statusWhiteBackGround视图用于更改状态栏的颜色。 这是上面代码的结果：

但是当应用程序进入背景然后又返回到前景时，redBackGroundColor视图将其更改为orging.y，如下面的图片所示：

有什么问题吗？谢谢

Answer 1

在方法上以编程方式创建UIView

-(void)viewDidLayoutSubviews{

     screen=[[UIScreen mainScreen] bounds];

//Simple view
    self.customView = [[CustomAlertOKView alloc]initWithFrame:CGRectMake(0, 20, screen.size.width, screen.size.height)];

     [self.view addSubView:customView];

}

要么

使用情节提要板创建视图，并根据屏幕尺寸将x设置为0，y值设置为20，宽度和高度

@IBOutlet UIView *customView;

在情节提要中设置出口，

然后将自定义视图的背景色设置为红色，将主视图的背景色设置为白色

self.view.backgroundColor = [UIColor whiteColor];
customView.backgroundColor = [UIColor redColor];