Question

我在viewDidLoad()以外的方法中添加子视图，并且不显示子视图。我的代码如下：

 -(void) displayBanner
{ 

    SharedApp *instance=[SharedApp sharedInstance];
    [NSTimer scheduledTimerWithTimeInterval:2.0 target:self selector:@selector(targetMethod:) userInfo:nil repeats:YES];

 numTimerTicks = 0;

   roundedButtonType = [[UIButton buttonWithType:UIButtonTypeRoundedRect]retain]; //Creates a UIButton
   roundedButtonType.frame = CGRectMake(0.0f, 360.0f, 320.0f, 60.0f); //sets the coordinates and dimensions of UIButton
   roundedButtonType.backgroundColor = [UIColor clearColor]; //sets the background color
   roundedButtonType.tag = numTimerTicks;
  //  [instance configView];
   NSLog(@"the home array is %@",instance.homeImageArray);
   [roundedButtonType setBackgroundImage:[instance.homeImageArray objectAtIndex:numTimerTicks] forState:UIControlStateNormal];
   [roundedButtonType addTarget:self action:@selector(showDetails:)forControlEvents:UIControlEventTouchUpInside]; //sets the Background image
   [roundedButtonType setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; 

  HomePageViewController *homepage = [[HomePageViewController alloc]initWithNibName:@"HomePageViewController" bundle:nil];
  [homepage.view addSubview:roundedButtonType];


   //Oops forgot to add this one... my bad.. :D :D
   [self.view addSubview:homepage.view];// Image displayed but goes into endless loop

}

如果我一直在做正确的事以及我一直缺少什么，有人能告诉我吗？

提前致谢。

Answer 1

而不是：

[homepage.view addSubview:roundedButtonType];

这样做：

[self.view addSubview:roundedButtonType];

Answer 2

这段代码非常好：

HomePageViewController *homepage = [[HomePageViewController alloc] initWithNibName:@"HomePageViewController" bundle:nil];
[homepage.view addSubview:roundedButtonType];

您的按钮已添加到HomePageViewController。

但HomePageViewController未添加到任何地方，因此无法显示。你必须展示它。例如。在当前的ViewController上使用pushViewController / presentModalViewController，或在窗口上使用setRootViewController。

Answer 3

您提供的数据不正确。可能是这两个原因，我已经给出了一些提示让我知道这不是你想要的。

首先 UI调用的更改必须从主线程发生。做一件事。运行[self performSelectorOnMainThread:@selector() withObject:nil waitUntilDone:]

中的方法

二主页。视图不可见。你可以给self.view（如果你从viewcontroller调用这个方法）。

在viewDidLoad以外的方法中添加子视图

3 个答案: