Iphone 加载视图未显示期间添加的UIToolBar项

我有一个UIViewController，它是通过编程方式创建的。我在loadView中包含以下代码。显示了工具栏，但没有显示我添加的按钮。任何帮助都将不胜感激

[self.navigationController setToolbarHidden:NO animated:NO];

    UIBarButtonItem *actionB = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(actionBTapped:)];
    [self.navigationController.toolbar setItems:[NSArray arrayWithObject:actionB] animated:NO];
    [actionB release];

试试这个：

NSMutableArray *items = [[[NSMutableArray alloc] init] autorelease];
UIBarButtonItem *labelButton = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:nil action:nil] autorelease];
[items addObject:labelButton];
[items addObject:[[[UIBarButtonItem alloc] initWithTitle:@"YoutTitle" style:UIBarButtonItemStyleDone target:self action:@selector(actionBTapped:)] autorelease]];
[self.navigationController.toolbar setItems:items animated:NO];

试试这个：

NSMutableArray *items = [[[NSMutableArray alloc] init] autorelease];
UIBarButtonItem *labelButton = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:nil action:nil] autorelease];
[items addObject:labelButton];
[items addObject:[[[UIBarButtonItem alloc] initWithTitle:@"YoutTitle" style:UIBarButtonItemStyleDone target:self action:@selector(actionBTapped:)] autorelease]];
[self.navigationController.toolbar setItems:items animated:NO];

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要在UIViewController本身而不是其导航控制器上设置项目：

self.toolbarItems = [NSArray arrayWithObject:actionB];

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要在UIViewController本身而不是其导航控制器上设置项目：

self.toolbarItems = [NSArray arrayWithObject:actionB];