Twitter iOS應用v5.3 UINavigationController後退按鈕

Question

在最近發佈的Twitter應用更新中，文本從後退按鈕中刪除，並用箭頭替換。它看起來非常好，很簡單，但我無法弄清楚他們是如何做到的。

我試圖與iOS 5的UI定製玩耍，但沒有真正運作良好。如果我設置leftBarButtonItem，我可以使它工作，但這意味着我必須在每個視圖控制器中執行此操作，並編寫自己的操作以彈出視圖控制器。有任何想法嗎？提前致謝。

Answer 1

它的自定義導航欄和按鈕item.Add驗證碼：

UINavigationBar * bar =[[UINavigationBar alloc]initWithFrame:CGRectMake(0, 0, 320, 44)]; 
[self.view addSubview:bar]; 

//Back Button 
UIButton *btnback = [UIButton buttonWithType:UIButtonTypeCustom]; 
[btnback setFrame:CGRectMake(0, 7, 54, 29)]; 
[btnback setBackgroundImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal]; 
//UILabel * btnlabel = [[UILabel alloc]initWithFrame:CGRectMake(15, 0, 40, 23)]; 
//btnlabel.backgroundColor = [UIColor clearColor]; 
//btnlabel.textColor = [UIColor whiteColor]; 
//btnlabel.font = [UIFont boldSystemFontOfSize:13]; 
//btnlabel.text = @"back"; 
//[btnback addSubview:btnlabel]; 
//[btnlabel release]; 
//btnlabel = nil; 
[btnback addTarget:self action:@selector(BackAction:) forControlEvents:UIControlEventTouchUpInside]; 
[bar addSubview:btnback]; 
[bar release]; 

Answer 2

無需設置後退按鈕或將其添加爲navigationController的子視圖。您只需要在mainViewController中設置後退按鈕屬性。像

UIBarButtonItem *backButton = [[[UIBarButtonItem alloc] initWithTitle:NSLocalizedString(@"Back", nil) style:UIBarButtonItemStyleBordered target:nil action:nil] autorelease]; 

buttonBack32 = [[UIImage imageNamed:@"back_button.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 13, 0, 4)]; 

buttonBack24 = [[UIImage imageNamed:@"back_button.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 12, 0, 4)]; 

[[UIBarButtonItem appearance] setBackButtonBackgroundImage:buttonBack32 forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; 

[[UIBarButtonItem appearance] setBackButtonBackgroundImage:buttonBack24 forState:UIControlStateNormal barMetrics:UIBarMetricsLandscapePhone]; 
self.navigationItem.backButton = backButton; 

或者你甘蔗遵循本教程http://www.raywenderlich.com/4344/user-interface-customization-in-ios-5