iOS如何把导航默认的返回按钮设置成“返回”

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1. - (void)addBackItemWithAction:(SEL)action {
2. if (IOS7_OR_LATER) {
3. UIBarButtonItem *returnButtonItem = [[UIBarButtonItem alloc] init];
4. returnButtonItem.title = @"返回";
5. self.navigationItem.backBarButtonItem = returnButtonItem;
6. } else {
7. // 设置返回按钮的文本
8. UIBarButtonItem *backButton = [[UIBarButtonItem alloc]
9. initWithTitle:@"返回"
10. style:UIBarButtonItemStylePlain target:nil action:nil];
11. [self.navigationItem setBackBarButtonItem:backButton];
12. // 设置返回按钮的背景图片
13. UIImage *img = [UIImage imageNamed:@"ic_back_nor"];
14. img = [img resizableImageWithCapInsets:UIEdgeInsetsMake(0, 18, 0, 0)];
15. [[UIBarButtonItem appearance] setBackButtonBackgroundImage:img
16. forState:UIControlStateNormal
17. barMetrics:UIBarMetricsDefault];
18. // 设置文本与图片的偏移量
19. [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(5, 0)
20. forBarMetrics:UIBarMetricsDefault];
21. // 设置文本的属性
22. NSDictionary *attributes = @{UITextAttributeFont:[UIFont systemFontOfSize:16],
23. UITextAttributeTextShadowOffset:[NSValue valueWithUIOffset:UIOffsetZero]};
24. [[UIBarButtonItem appearance] setTitleTextAttributes:attributes forState:UIControlStateNormal];
25. }
26. return;
27. }