问题描述
我有一个不想被禁用的UIBarButtonItem。简短版本：当我打电话时
I have a UIBarButtonItem that just doesn't want to get disabled. Short version: when I call
[myBarButtonItem setEnabled:NO];
没有任何反应。
myBarButtonItem 是 myVIewController 中的IBOutlet。 myViewController 已作为对象添加到Interface Builder中的 MainWindow 。 myBarButtonItem 出口已连接到BarButtonItem，并具有相应的 @syntesize 和属性行设置。
myBarButtonItem is an IBOutlet in myVIewController. myViewController has been added as an object to MainWindow in Interface Builder. The myBarButtonItem outlet has been connected to the BarButtonItem, and has the corresponding @syntesize and property lines set.
@property (nonatomic, retain) IBOutlet UIBarButtonItem *myBarButtonItem;
在myViewController.m中，
In myViewController.m,
@synthesize myBarButtonItem;
任何人都知道为什么以上 setEnabled 方法没有影响？谢谢！
Anyone have an idea why the above setEnabled method has no affect? Thanks!
更新：修正了！不知道为什么，但显然出口没有设置。我使用我的App Delegate作为UIBarButtonItem的父对象，并且一切顺利。
UPDATE: Fixed it! Don't know why, but apparently the outlet wasn't being set. I used my App Delegate as the parent object for the UIBarButtonItem, and all worked out.
推荐答案
您可以禁用左侧导航按钮从这样的UIViewController里面，不使用任何IBOutlet：
You can disable the left navigation button from inside an UIViewController like this, without using any IBOutlet:
self.navigationItem.leftBarButtonItem.enabled = NO;
要禁用右侧导航按钮：
self.navigationItem.rightBarButtonItem.enabled = NO;
Swift3
self.navigationItem.rightBarButtonItem?.isEnabled = false
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