後退按鈕在iPhone的iPhone OS 4.0的導航欄中不可見

在我的應用程序（基於視圖）中，後退按鈕在導航欄中不可見。如果我點擊那個按鈕，這些操作就可以正常工作。這對我來說很奇怪。後退按鈕在iPhone OS 3.0和其他版本中可見並可正常工作（OS 4.0除外）。我目前正在iPhone OS 4.0中工作。後退按鈕在iPhone的iPhone OS 4.0的導航欄中不可見

這裏是我的代碼：

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，僅適用於iPhone OS 4.0。那麼我怎麼能做到這一點？

來源

2010-06-26 Pugal

只要你替換這個代碼，無論你想在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];

我希望它能幫助ypu。

來源

2010-06-29 08:29:16 Sivanathan

你好早安，我有同樣的問題，它仍然不能在iOS 4.3上工作。我使用2代碼1st設置自定義uinavigation欄如下： 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發佈]; } 然後您發送的代碼..任何幫助請參閱？ – Veer 2012-02-15 17:19:16

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];

來源

2010-12-26 13:15:08

後退按鈕在iPhone的iPhone OS 4.0的導航欄中不可見

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