如何获得uiview显示在按钮点击iphone

Question

我有一个应用程序，其中我有一个uiview上有两个按钮。我已经设置了我的uiview框架。

newview = [[UIView alloc]initWithFrame:CGRectMake(0,350,320,70)]; 

并将其设置为我的主要观点

[self.view addSubview:newview]; 

然后我添加了两个按钮，这个新的观点。新视图右侧的新按钮和其他按钮上的一个按钮。

这是我的按钮

leftnavbutton= [[UIButton buttonWithType:UIButtonTypeCustom] retain]; 
      leftnavbutton.backgroundColor = [UIColor clearColor]; 
      [leftnavbutton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal ]; 

UIImage *buttonImageleft = [UIImage imageNamed:@"previous_large.png"]; 
      //UIImage *strechableButtonImageNormal = [buttonImageNormal stretchableImageWithLeftCapWidth:12 topCapHeight:0]; 

[leftnavbutton setBackgroundImage:buttonImageleft forState:UIControlStateNormal]; 
      [leftnavbutton addTarget:self action:@selector(playAction:) forControlEvents:UIControlEventTouchUpInside]; 
[leftnavbutton setFrame:CGRectMake(23, 28, 8, 44)]; 
      [newview addSubview:leftnavbutton]; 



rightnavbutton= [[UIButton buttonWithType:UIButtonTypeCustom] retain]; 
      rightnavbutton.backgroundColor = [UIColor clearColor]; 
      [rightnavbutton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal ]; 

UIImage *buttonImageright = [UIImage imageNamed:@"next_large.png"]; 
      //UIImage *strechableButtonImageNormal = [buttonImageNormal stretchableImageWithLeftCapWidth:12 topCapHeight:0];    

[rightnavbutton setBackgroundImage:buttonImageright forState:UIControlStateNormal];   

[rightnavbutton addTarget:self action:@selector(play:) forControlEvents:UIControlEventTouchUpInside];   

[rightnavbutton setFrame:CGRectMake(275, 28, 8, 44)]; 
[newview addSubview:rightnavbutton]; 

代码，所以现在我想，当我对这些按钮点击。一种新观点应该取代我的新观点。 例如，现在当我在新视图中运行我的应用程序时，将显示当前从xml获取的条件。所以当我点击右边的按钮时，应该打开一个新的视图，它应该获取forecat条件标签fron xml并显示在它上面，当我点击右边的按钮时它应该再次显示当前的条件。即它应该在循环中。如果我点击左边的按钮，则应显示预测条件。这怎么可能？

Answer 1

您只需用另一个视图替换newView即可。要做到这一点，你应该首先设置newView的tag。

newview = [[UIView alloc]initWithFrame:CGRectMake(0,350,320,70)]; 
newView.tag = 7; // set whatever number you want 
[self.view addSubview:newview]; 

在playAction，得到newView的保持和从superView删除它。然后在其位置添加另一个视图。

-(void)playAction:(id)sender 
{ 
    UIView* newView = [self.view viewWithTag:7]; 
    [newView removeFromSuperView]; 

    //create and add the new new view that should replace new view. Use the same frame. 
    UIView* newnewview = [[UIView alloc]initWithFrame:CGRectMake(0,350,320,70)]; 
    newnewView.tag = 7; // set whatever number you want 
    [self.view addSubview:newnewview]; 

     //Add the left & right buttons again, as they were removed when newView was removed 
     ... code to add buttons... 
} 

类似地，可以实施play:方法。