如何使用UINavigationController的自定义视图创建backBarButtomItem [英] How to create backBarButtomItem with custom view for a UINavigationController

问题描述

我有一个 UINavigationController ，其中我推几个视图。 viewDidLoad 对于其中一个视图，我想将 self.navigationItem.backBarButtonItem 设置为自定义视图自定义图像）。我不知道为什么，但它似乎不工作。

  UIButton * backButton = [[UIButton alloc] initWithFrame：CGRectMake（0， 0，63，30）]; 
 [backButton setImage：[UIImage imageNamed：@back_OFF.png] forState：UIControlStateNormal]; 
 [backButton setImage：[UIImage imageNamed：@back_ON.png] forState：UIControlStateSelected]; 
 UIBarButtonItem * backButtonItem = [[UIBarButtonItem alloc] initWithCustomView：backButton]; 
 self.navigationItem.backBarButtonItem = backButtonItem; 
 [backButtonItem release]; 
 [backButton release]; 
  

我测试了一个标准的标题，它工作。

  self.navigationItem.backBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle：@Prout style：UIBarButtonItemStyleDone target：nil action：nil] autorelease];感谢您对此的任何帮助。
 
 >解决方案
我相当确定 backBarButtonItem 是一个只读属性。而不是修改 backBarButtonItem ，尝试设置自定义 leftBarButtonItem 并隐藏 backBarButtonItem ：
  self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle：@Proutstyle：UIBarButtonItemStyleDone target：nil action：nil] autorelease]; 
 self.navigationItem.hidesBackButton = YES; 
  
您还需要确保挂接自定义按钮， code> UINavigationBar 。
 
I have a UINavigationController into which I push several views. Inside viewDidLoad for one of these views I want to set the self.navigationItem.backBarButtonItem to a custom view (based on a custom image). I don't know why, but it doesn't seem to work. Instead, I get the standard "back" button.
UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 63, 30)];
[backButton setImage:[UIImage imageNamed:@"back_OFF.png"] forState:UIControlStateNormal];
[backButton setImage:[UIImage imageNamed:@"back_ON.png"] forState:UIControlStateSelected];
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.backBarButtonItem = backButtonItem;
[backButtonItem release];
[backButton release];
I tested with a standard title and it worked. What is wrong with the above code ?
self.navigationItem.backBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Prout" style:UIBarButtonItemStyleDone target:nil action:nil] autorelease];
Thanks for any help on this.
解决方案
I'm fairly certain that the backBarButtonItem is a read-only property.  Instead of modifying the backBarButtonItem, try setting a custom leftBarButtonItem and hide the backBarButtonItem:
self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithTitle:@"Prout" style:UIBarButtonItemStyleDone target:nil action:nil] autorelease];
self.navigationItem.hidesBackButton = YES;
You will also need to make sure you hook up the custom button to call the back action on the UINavigationBar.

                        
这篇关于如何使用UINavigationController的自定义视图创建backBarButtomItem的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！