只有圖像的自定義導航欄後退按鈕

Question

我想顯示自定義導航欄後退按鈕。我只想顯示它的圖像。我想在整個應用程序中使用此按鈕也不想在每個文件中創建此按鈕。我怎麼能夠？？

這裏是我的代碼：

// Set the custom back button 
     UIImage *buttonImage = [UIImage imageNamed:@"back_arrow.png"]; 

     //create the button and assign the image 
     UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 
     [button setImage:buttonImage forState:UIControlStateNormal]; 

     //set the frame of the button to the size of the image (see note below) 
     button.frame = CGRectMake(0, 0, buttonImage.size.width, buttonImage.size.height); 

     [button addTarget:self action:@selector(popViewControllerAnimated:) forControlEvents:UIControlEventTouchUpInside]; 

     //create a UIBarButtonItem with the button as a custom view 
     UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:button]; 
     self.navigationItem.leftBarButtonItem = customBarItem; 

但這僅顯示當前頁面上。

另一個代碼：

[[UIBarButtonItem appearance] setBackButtonBackgroundImage:[UIImage imageNamed:@"back_arrow.png"] forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; 

使用這個代碼返回按鈕圖像是表示整個應用程序。但文字「返回」也顯示。我怎麼解決這個問題。

在此先感謝。

Answer 1

我在過去使用過一個類來做到這一點。

在UIBarButtonItem上創建一個名爲+ projectButtons（或其他）的類別。

然後你就可以有一個函數像...

+ (UIBarButtonItem)backArrowButtonWithTarget:(id)target action:(SEL)action 
{ 
    UIImage *buttonImage = [UIImage imageNamed:@"back_arrow.png"]; 

    //create the button and assign the image 
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 
    [button setImage:buttonImage forState:UIControlStateNormal]; 

    //set the frame of the button to the size of the image (see note below) 
    button.frame = CGRectMake(0, 0, buttonImage.size.width, buttonImage.size.height); 

    [button addTarget:target action:action forControlEvents:UIControlEventTouchUpInside]; 

    //create a UIBarButtonItem with the button as a custom view 
    UIBarButtonItem *customBarItem = [[UIBarButtonItem alloc] initWithCustomView:button]; 
    return customBarItem; 
} 

然後把它添加到你喜歡這樣的導航欄...

self.navigationItem.leftBarButtonItem = [UIBarButtonItem backArrowButtonWithTarget:self action:@selector(popViewControllerAnimated:)]; 

這意味着你只需要一行代碼創建它，但是你仍然可以在每個你使用它的VC中獲得目標和動作的定製。如果你決定改變按鈕的外觀，那麼它都在一個地方完成。