blocks|key|2906848|text|而不是|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2906849|self.navigationItem.leftBarButtonItem.title+=+@"NEW+TITLE";|code-block|syntax|javascript|2906850|使用|2906851|UIButton+*backButton+=+(UIButton+*)self.navigationItem.leftBarButtonItem.customView;
backButton.titleLabel.text+=+@"changed";|2906852|更新：如果您想在添加到导航栏之前更改标题，请执行以下操作|offset|length|style|BOLD|2906853|UIButton+*backButton+=+(UIButton+*)_backItem.customView;
backButton.titleLabel.text+=+@"changed";|2906854|entityMap^0|0|0|0|0|0|2|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|Y|8|@$M|Z|N|10|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

Instead of

<pre><code>self.navigationItem.leftBarButtonItem.title = @"NEW TITLE";
</code></pre>

use

<pre><code>UIButton *backButton = (UIButton *)self.navigationItem.leftBarButtonItem.customView;
backButton.titleLabel.text = @"changed";
</code></pre>

UPDATE:
If you want to change the title before adding it on the nav bar do the following

<pre><code>UIButton *backButton = (UIButton *)_backItem.customView;
backButton.titleLabel.text = @"changed";
</code></pre>

blocks|key|2906879|text|您可以使用以下命令再次访问该按钮：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2906880|UIView*+view+=+self.navigationItem.leftBarButtonItem.customView;
UIButton*+button+=+(UIButton*)view;
[button+setTitle:+@"NEW+TITLE"+forState:+UIControlStateNormal];|code-block|syntax|javascript|2906881|你正在启动iOS+Nayefc吗，我看到你最近几天有很多问题:)|2906882|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

You can access the button again using: 

<pre><code>UIView* view = self.navigationItem.leftBarButtonItem.customView;
UIButton* button = (UIButton*)view;
[button setTitle: @"NEW TITLE" forState: UIControlStateNormal];
</code></pre>

Are you starting iOS Nayefc, I see you have a lot of questions these last few days :)

blocks|key|1644328|text|修复方法如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1644329|+[button+setTitle:@"Back"+forState:UIControlStateNormal];|code-block|syntax|javascript|1644330|必须定义状态。|1644331|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Here's the fix:

<pre><code> [button setTitle:@"Back" forState:UIControlStateNormal];
</code></pre>

The state has to be defined.

blocks|key|2819863|text|对于任何看起来像我这样的人来说，在较新版本的iOS中，公认的答案不再有效。它已经变成了barButton.title，这是一个读写String?+(在Swift中)或NSString(在Obj-C中)。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2819864|entityMap^0|1T|7|2B|8|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

For anyone looking (like me just now), in newer versions of iOS the accepted answer no longer works. It has become barButton.title, which is a read-write <code>String?</code> (in Swift) or <code>NSString</code>(in Obj-C).

I have the following UIBarButton Item:

<pre><code> UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 100.0f, 45.0f, 30.0f)];
 [backButton setBackgroundImage:backButtonImage forState:UIControlStateNormal];
 [backButton addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchDown];
 backButton.titleLabel.text = @"Back";
 backButton.titleLabel.font = [UIFont fontWithName:@"texgyreadventor-regular.otf" size:20.0f];
 backButton.titleLabel.textColor = [UIColor whiteColor];
 UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
 _backItem = backItem;
</code></pre>

In some other method, I set it to be on the navigation bar as follows:

<code>[self.navigationItem setLeftBarButtonItem:_backItem];</code>

So far, everything works as expected. But right before I add it on the navigation bar on top, I would like to change its text. Here's one the things I tried doing: 

<code>self.navigationItem.leftBarButtonItem.title = @"NEW TITLE";</code>

This however, does not work. How can I add a title during runtime on the fly?

UIBarButtonItem Title Change

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有以下UIBarButton项：  UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0.0f, 100.0f, 45.0f, 30.0f)];    [backButton setBackgroundImage:backButtonI...

问UIBarButtonItem标题更改
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