iphone - 使用 UIBarButtonItemStyle 创建一个 UIBarButtonSystemItem

Question

我想创建一个系统 UIBarButton，但我希望它具有简单的样式。
我试过这段代码，但样式被忽略了。有什么问题吗？

UIBarButtonItem *search = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(showSearch)];    
search.style = UIBarButtonItemStylePlain;
self.navigationItem.rightBarButtonItem = search;
[search release];

Answer 1

这里最主要的是您需要将按钮放在前一个 Controller 中，而不是将要按下的 Controller 中。

//Your actual ViewController
UIBarButtonItem *search = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemSearch target:self action:@selector(showSearch)];    
search.style = UIBarButtonItemStylePlain;
self.navigationItem.rightBarButtonItem = search;
[search release];

//Controller that is going to be pushed and will display the new UIBarButtonItem
[self.navigationController pushViewController:newViewController animated:YES];