Navigation Controller原本就有返回按鈕，然而我們想要客製化為包含文字與圖片，可以怎麼做呢？預設是返回圖案和前一視圖的標題，如今我們想換成別的圖案和標題。
套用以下程式碼即可做到～
/**
Theme: Back Button with Text and Image
IDE: Xcode 7
Language: Objective C
Date: 105/01/20
Author: HappyMan
Blog: https://cg2010studio.wordpress.com/
*/
UIImage *backIcon = [[UIImage imageNamed:@"backIcon"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
[backButton addTarget:self action:@selector(back:) forControlEvents:UIControlEventTouchUpInside];
[backButton setImage:backIcon forState:UIControlStateNormal];
[backButton setTitle:@"返回" forState:UIControlStateNormal];
[backButton setTitleColor:[UIColor blueColor] forState:UIControlStateNormal];
[backButton sizeToFit];
UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithCustomView:backButton];
self.navigationItem.leftBarButtonItem = barButton;
我們還可以指定點擊按鈕後的反應，若使用預設則很難抓到觸發時機點。
如此一來，我們便可以在點擊按鈕時做判斷，來決定是不是真要返回前一頁。
參考：How to have a UIBarButtonItem with both image and text。
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