将自定义按钮添加到UINavigationItem LeftBarButtonItem

本文介绍了将自定义按钮添加到UINavigationItem LeftBarButtonItem的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

谁能告诉我为什么此代码不起作用?

Could anyone tell me why this code does not working?

self.backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[self.backButton setImage:[UIImage imageNamed:@"back_arrow.png"]
                 forState:UIControlStateNormal];
self.backButton.contentMode = UIViewContentModeCenter;
[self.backButton addTarget:self
                    action:@selector(backButtonAction:)
          forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithCustomView:self.backButton];
[navigationItem setLeftBarButtonItem:backButtonItem animated:NO];
navigationItem.hidesBackButton = YES;

leftBarButtonItem上没有任何内容.那是问题.

Nothing appears on the leftBarButtonItem. That's the problem.

推荐答案

来自文档:

因此，如果在第2行中设置框架，您应该会看到一些东西，例如:

So you should see something if you set the frame in line 2, eg:

self.backButton.frame = CGRectMake(0, 0, 40, 20);

这篇关于将自定义按钮添加到UINavigationItem LeftBarButtonItem的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！