UIBarButtonItem在我成功将其添加到navigationitem后未显示

此任务看起来非常简单。你可以从下面的日志中看到，我检查它是否设置成功，它是。那么有什么想法为什么当导航控制器推到这个视图时它不会显示？它与navigationItem和[navigationBar items]之间的区别有什么关系？UIBarButtonItem在我成功将其添加到navigationitem后未显示

NSLog(@"Nav bar's item is: %@", [[[[[self navigationController] navigationBar] items] objectAtIndex:0] description]); 
    NSLog(@"The navigationItem's Right bar button is: %@", [[[self navigationItem] rightBarButtonItem] description]); 

    //create bar button item with segmented control as custom view 
    UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObjects:@"One", @"Two", nil]]; 
    UIBarButtonItem *barButtonItem = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl]; 
    NSLog(@"Created bar button item: %@", barButtonItem); 
    NSLog(@"Bar button item's view is: %@", [barButtonItem customView]); 

    //add segmented control bar button item to navigation bar 

    [[self navigationItem] setRightBarButtonItem:barButtonItem]; 
    NSLog(@"Added bar button item, %@, to nav item %@", barButtonItem, [self navigationItem]); 
    NSLog(@"Now Nav bar's item is: %@", [[[[[self navigationController] navigationBar] items] objectAtIndex:0] description]); 
    NSLog(@"Now the navigationItem's Right bar button is: %@", [[[self navigationItem] rightBarButtonItem] description]);

日志

 Nav bar's item is: <UINavigationItem: 0x7586a60> 
    The navigationItem's Right bar button is: (null) 
    Created bar button item: <UIBarButtonItem: 0x90a2180> 
    Bar button item's view is: <UISegmentedControl: 0x90a11e0; frame = (0 0; 101 44); opaque = NO; layer = <CALayer: 0x90a1150>> 
    Added bar button item, <UIBarButtonItem: 0x90a2180>, to nav item <UINavigationItem: 0x909c5a0> 
    Now Nav bar's item is: <UINavigationItem: 0x7586a60> 
    Now the navigationItem's Right bar button is: <UIBarButtonItem: 0x90a2180>

但没有什么，除了默认的后退按钮导航栏显示出来。

非常感谢您的帮助，

来源

2013-10-09 roro

您是否将NavigationItem设置为NavigationBar？看起来你没有在你的代码片段中完成它。

在你的日志说，你创建的Navigationitem前：

Nav bar's item is: <UINavigationItem: 0x7586a60>

，后，还是一样：

Now Nav bar's item is: <UINavigationItem: 0x7586a60>

来源

2013-10-09 02:06:51

UIBarButtonItem在我成功将其添加到navigationitem后未显示

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