后退按钮在自定义导航栏上显示一半iPad

自定义导航栏上的后退按钮在iPad上显示为一半，它在iPhone上正常显示。应用程序只支持肖像模式。后退按钮在自定义导航栏上显示一半iPad

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源代码，

UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
if (isPad) { 
    backButton.frame = CGRectMake(0, 0, 120, 70); 
    [backButton setBackgroundImage:[UIImage imageNamed:@"BackButtonUnpressed-iPad_120X70.png"] forState:UIControlStateNormal]; 
    [backButton setBackgroundImage:[UIImage imageNamed:@"BackButtonPressed-iPad_120X70.png"] forState:UIControlStateHighlighted]; 
}else{ 
    backButton.frame = CGRectMake(0, 0, 60, 35); 
    [backButton setBackgroundImage:[UIImage imageNamed:@"BackButtonUnpressed.png"] forState:UIControlStateNormal]; 
    [backButton setBackgroundImage:[UIImage imageNamed:@"BackButtonPressed.png"] forState:UIControlStateHighlighted]; 
} 

[backButton addTarget:self action:@selector(backButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; 
UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton]; 
self.navigationItem.leftBarButtonItem = buttonItem; 
[buttonItem release]; buttonItem = nil;

请帮助。

来源

2011-11-14 SST

当你设置'会发生什么backButton.frame = CGRectMake（ 0,10,60,35）'？ I.E.将X＆Y参数更改为初始按钮框架， –

@MichaelDautermann：我也试过，但它没有做任何改变。如果你改变它，唯一改变的是它的高度和宽度。 – SST

我解决了这个问题，在这里张贴的细节，因此它可能是帮助他人

 
1] created a UIButton, with custom image. 
2] created a UIView, which will fit properly on UINavigationbar. 
3] added UIButton on UIView. 
4] created UIBarButtonItem with custom view.

这里是代码，

 
    if (isPad) { 
     UIView *customView = [[UIView alloc] initWithFrame:CGRectMake(10, 0, 200, 200)]; 
     UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
     backButton.frame = CGRectMake(0, 90, 120, 70); 
     [backButton setBackgroundImage:[UIImage imageNamed:@"BackButtonUnpressed-iPad_120X70.png"] forState:UIControlStateNormal]; 
     [backButton setBackgroundImage:[UIImage imageNamed:@"BackButtonPressed-iPad_120X70.png"] forState:UIControlStateHighlighted]; 
     [backButton addTarget:self action:@selector(backButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; 
     [customView addSubview:backButton]; 

     UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithCustomView:customView]; 
     self.navigationItem.leftBarButtonItem = buttonItem; 
     [customView release]; customView = nil; 
     [buttonItem release]; buttonItem = nil; 
    }else{ 
     UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
     backButton.frame = CGRectMake(0, 0, 60, 35); 
     [backButton setBackgroundImage:[UIImage imageNamed:@"BackButtonUnpressed.png"] forState:UIControlStateNormal]; 
     [backButton setBackgroundImage:[UIImage imageNamed:@"BackButtonPressed.png"] forState:UIControlStateHighlighted]; 
     [backButton addTarget:self action:@selector(backButtonPressed:) forControlEvents:UIControlEventTouchUpInside]; 
     UIBarButtonItem *buttonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton]; 
     self.navigationItem.leftBarButtonItem = buttonItem; 
     [buttonItem release]; 
     buttonItem = nil; 
    }

来源

2011-11-19 09:34:06 SST

Ahhh，我只是意识到你正在试图通过一个初期的UIView而不是一个控件来将UIButton控件强制转换为UIBarButtonItem。

不要那样做！

为什么不只是通过创建栏按钮项目：

UIBarButtonItem * buttonItem = 
    [[UIBarButtonItem alloc] initWithTitle: @"Back" 
            style: UIBarButtonItemStyleDone 
            target: self 
            action: @selector(backButtonPressed:);

而让O.S.处理适当的突出显示（如果有的话）。

来源

2011-11-15 05:33:48

实际上我有一个自定义导航栏，所以默认的UIBarButtonItem不会很好看。 – SST

后退按钮在自定义导航栏上显示一半iPad

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