UIView没有被删除

Question

我需要根据UIInterfaceOrientation显示不同大小的UIImage。现在的问题是，每次程序改变方向时，图像仍然存在，新图像重叠。这里是我的东西

UIView *logoView; 

UIImage *image = [UIImage imageNamed:@"pic.png"]; 
UIImageView *imageView = [[UIImageView alloc] initWithImage:image]; 
[logoView removeFromSuperview]; 
CGRect rect; 
UIInterfaceOrientation newOrientation = [UIApplication sharedApplication].statusBarOrientation; 
if(newOrientation == UIInterfaceOrientationLandscapeLeft || newOrientation == UIInterfaceOrientationLandscapeRight) 
{ 
    rect = CGRectMake(0, 0, self.view.bounds.size.width/2, self.view.bounds.size.height/4); 
    logoView = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.view.bounds.size.width/2, self.view.bounds.size.height/4)]; 
} 

else if (newOrientation == UIInterfaceOrientationPortrait || newOrientation == UIInterfaceOrientationPortraitUpsideDown) 
{ 
    rect = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height/4); 
    logoView = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.view.bounds.size.width, self.view.bounds.size.height/4)]; 
} 
imageView.frame = logoView.bounds; 
[logoView addSubview:imageView]; 


[self.view addSubview:logoView]; 

Answer 1

问题是logoView是一个局部变量。所以[logoView removeFromSuperview]将无法​​正常工作。

让logoView一个物业或类变量将修复它。

Answer 2

创建全局logoView

如果它不是来自上海华

if(logoView){ 

    [logoView removeFromSuperview]; 
logoView = nil; 
    } 

空删除它，如果它为null，则只有intialize它

if(newOrientation == UIInterfaceOrientationLandscapeLeft || newOrientation == UIInterfaceOrientationLandscapeRight) 
{ 
    rect = CGRectMake(0, 0, self.view.bounds.size.width/2, self.view.bounds.size.height/4); 
if(!logoView){ 
    logoView = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.view.bounds.size.width/2, self.view.bounds.size.height/4)]; 
} 
} 




else if (newOrientation == UIInterfaceOrientationPortrait || newOrientation == UIInterfaceOrientationPortraitUpsideDown) 
{ 
    rect = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height/4); 
if(!logoView){ 
    logoView = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.view.bounds.size.width, self.view.bounds.size.height/4)]; 
} 
} 

Answer 3

[logoView removeFromSuperview];不会删除旧的logoView。事实上，如果您不将logoView作为控制器中的一个属性，您将无法获得logoView并将其从self.view中删除。

@interface ViewController() 

@property (nonatomic, strong) UIView *logoView;//You can keep it and get it when you want to remove it. 

@end 

然后：

[self.logoView removeFromSuperview];//get the logoView and remove it. 
UIView *logoView; 

UIImage *image = [UIImage imageNamed:@"pic.png"]; 
UIImageView *imageView = [[UIImageView alloc] initWithImage:image]; 

CGRect rect; 
UIInterfaceOrientation newOrientation = [UIApplication sharedApplication].statusBarOrientation; 
if(newOrientation == UIInterfaceOrientationLandscapeLeft || newOrientation == UIInterfaceOrientationLandscapeRight) { 
    rect = CGRectMake(0, 0, self.view.bounds.size.width/2, self.view.bounds.size.height/4); 
    logoView = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.view.bounds.size.width/2, self.view.bounds.size.height/4)]; 
} else if (newOrientation == UIInterfaceOrientationPortrait || newOrientation == UIInterfaceOrientationPortraitUpsideDown) { 
    rect = CGRectMake(0, 0, self.view.bounds.size.width, self.view.bounds.size.height/4); 
    logoView = [[UIView alloc] initWithFrame:CGRectMake(0,0,self.view.bounds.size.width, self.view.bounds.size.height/4)]; 
} 
imageView.frame = logoView.bounds; 

self.logoView = logoView;//keep logoView 

[logoView addSubview:imageView]; 

[self.view addSubview:logoView];//add logoView to self.view 

Answer 4

设置标签去除的UIView。我希望它将对你有用

logoView.tag = 108; //set the tag 
[[self.view viewWithTag:108]removeFromSuperview]; //remove the view the superview 

或变量分配给公众“logoView”