禁用 UINavigationItem 自定义右视图？

Question

我创建一个自定义右视图如下：

// Build the Segmented Control
NSArray *segmentTextContent = [NSArray arrayWithObjects:[UIImage imageNamed:@"arrow-dice.png"], [UIImage imageNamed:@"arrow-up.png"], [UIImage imageNamed:@"arrow-down.png"], nil];
UISegmentedControl *segmentedControl = [[UISegmentedControl alloc] initWithItems:segmentTextContent];

// Customize the Segmented Control
segmentedControl.momentary = YES;
segmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;
[segmentedControl addTarget:self action:@selector(segmentChanged:) forControlEvents:UIControlEventValueChanged];

然后我将它添加到我的导航栏，如下所示：

// Add the control to the navigation bar right item
UIBarButtonItem *segmentItem = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];
[segmentedControl release];
self.navigationItem.rightBarButtonItem = segmentItem;
self.navigationItem.rightBarButtonItem.title = @"";
[segmentItem release];

我可以如下隐藏它：

self.navigationItem.rightBarButtonItem.customView.hidden = NO;

问题 ...但是如何禁用分段控件的所有（或更好的特定元素）？

以下不起作用。

self.navigationItem.rightBarButtonItem.enabled = NO;

任何想法表示赞赏...

谢谢，
马特

Answer 1

UISegmentedControl.h

- (void)removeSegmentAtIndex:(NSUInteger)segment animated:(BOOL)animated;
- (void)removeAllSegments;
- (void)setEnabled:(BOOL)enabled forSegmentAtIndex:(NSUInteger)segment;       //default is YES

  e.g. [segmentedControl setEnabled:NO forSegmentAtIndex:1];

希望对你有帮助

Answer 2

[navItem.rightBarButtonItem setEnabled:NO];

就这么简单:)

参考：http://developer.apple.com/library/ios/#documentation/uikit/reference/UIBarItem_Class/Reference/Reference.html 查看 enabled 属性。