如何从视图动态隐藏按钮？ [英] How can I dynamically hide a button from a view?

问题描述

我想根据某个条件动态隐藏我的某个视图中的按钮。

I would like to dynamically hide a button in one of my views depending on a certain condition.

我试图向视图控制器的 -viewWillAppear 方法，在显示实际视图之前隐藏按钮，但我仍然不知道如何做。

I tried adding some code to the view controller's -viewWillAppear method, to make the button hidden before displaying the actual view, but I still don't know how to do that.

我有一个通过IBOutlet的按钮的引用，但我不知道如何从这里向前移动。作为参考，这是一个UIBarButtonItem实例。

I have a reference to the button through an IBOutlet, but I'm not sure how to move forward from here. For reference, this is a UIBarButtonItem instance.

推荐答案

如果你想隐藏一个UIBarButtonItem，修改父栏的内容。如果是UIToolBar，你需要将bar的items数组设置为不包含你的项目的数组。

If you're trying to hide a UIBarButtonItem, you'll actually have to modify the contents of the parent bar. If it's a UIToolBar, you'll need to set the bar's items array to an array that doesn't include your item.

NSMutableArray     *items = [[myToolbar.items mutableCopy] autorelease];
[items removeObject: myButton];
myToolbar.items = items;

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