更改BarButtonItem的标题

Question

如何在按钮上更改此标题？

Answer 1

如果这是来自导航控制器，设置父VC的标题会将按钮的标题设置为该字符串值。

Answer 2

iOS SDK不允许更改后退按钮的标题。

相反，您可以使用自定义后退按钮替换后退按钮：

+ (void)setBackButtonForViewController:(UIViewController *)vc target:(id)target selector:(SEL)selector
{
    UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];

    UIImage *image = [UIImage imageNamed:@"back_button.png"];

    [backButton setImage:image forState:UIControlStateNormal];
    backButton.bounds = CGRectMake(0, 0, image.size.width, image.size.height);

    UIBarButtonItem *temporaryBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];

    [backButton addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside];

    vc.navigationItem.leftBarButtonItem = temporaryBarButtonItem;
    vc.navigationItem.hidesBackButton = YES;
    [temporaryBarButtonItem release];    
}

您可以从http://www.teehanlax.com/blog/iphone-4-gui-psd-retina-display/抓取back_button.png图片。