后退按钮在iPhone的iPhone OS 4.0的导航栏中不可见

问题描述：

在我的应用程序（基于视图）中，后退按钮在导航栏中不可见。如果我点击那个按钮，这些操作就可以正常工作。这对我来说很奇怪。后退按钮在iPhone OS 3.0和其他版本中可见并可正常工作（OS 4.0除外）。我目前正在iPhone OS 4.0中工作。后退按钮在iPhone的iPhone OS 4.0的导航栏中不可见

这里是我的代码：

UIButton *btn=[[UIButton alloc] init]; 

[btn setImage:[UIImage imageNamed:@"Back.png"] forState:UIControlStateNormal]; 

[btn addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside]; 
[btn setImageEdgeInsets:UIEdgeInsetsMake(0, 70, 0, 20)]; 
UIBarButtonItem *b=[[UIBarButtonItem alloc] initWithCustomView:btn];  
self.navigationItem.leftBarButtonItem=b; 
[b release]; 
[btn release];

注：它不工作，仅适用于iPhone OS 4.0。那么我怎么能做到这一点？

答

只要你替换这个代码，无论你想在OS 4.0中工作正常。

UIButton *btn=[[UIButton alloc] initWithFrame:CGRectMake(0, 0, 70, 40)]; 

UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 70, 40)]; 

[myView addSubview:btn]; 

UIImageView *myImage = [[UIImageView alloc] initWithFrame:CGRectMake(0,5,50,30)]; 

[myImage setImage:[UIImage imageNamed:@"Back.png"]]; 

[myView addSubview:myImage]; 

[btn addTarget:self action:@selector(lOut) forControlEvents:UIControlEventTouchUpInside]; 

UIBarButtonItem *b1 = [[UIBarButtonItem alloc] initWithCustomView:myView]; 

self.navigationItem.leftBarButtonItem = b1; 

[btn release]; 

[b1 release]; 

[myView release]; 

[myImage release];

我希望它能帮助ypu。

你好早安，我有同样的问题，它仍然不能在iOS 4.3上工作。我使用2代码1st设置自定义uinavigation栏如下： UIImageView * imageView =（UIImageView *）[navBar viewWithTag：1]; if（imageView == nil） imageView = [[UIImageView alloc] initWithImage：[UIImage imageNamed：@“navigation.png”]]; [imageView setTag：1]; [navBar insertSubview：imageView atIndex：0]; [imageView发布]; } 然后您发送的代码..任何帮助请参阅？ – Veer 2012-02-15 17:19:16

答

UIButton *btn=[[UIButton alloc] initWithFrame:CGRectMake(0, 0, 44, 40)]; 
[btn setImage:[UIImage imageNamed:@"info44.png"] forState:UIControlStateNormal]; 
[btn setImage:[UIImage imageNamed:@"info44_glowing.png"] forState:UIControlStateHighlighted]; 
[btn addTarget:[AppDelegate sharedAppDelegate] action:@selector(settingAction:) forControlEvents:UIControlEventTouchUpInside]; 
UIBarButtonItem *settingButton = [[UIBarButtonItem alloc] initWithCustomView:btn]; 
self.navigationItem.leftBarButtonItem = settingButton; 
[btn release]; 
[settingButton release];

后退按钮在iPhone的iPhone OS 4.0的导航栏中不可见

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