如何更改後退按鈕從文本到圖像在UINavigationBar

Question

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] 
           initWithImage:@"rGoBack" 
           style:UIBarButtonItemStylePlain 
           target:nil action:nil]; 
self.navigationItem.backBarButtonItem = backButton; 
[backButton release]; 

我使用此源。但它不起作用。我不知道爲什麼不。請..

Answer 1

從第一眼：需要

initWithImage:@"rGoBack" 

這裏UIImage參數和NSString，而是隻傳遞。嘗試寫如下：

initWithImage:[UIImage imageNamed:@"rGoBack.png"]; // or whatever image name you have