UINavigation欄按鈕的背景圖像尺寸

Question

我想SOT集圖像背景的左後衛按鈕導航欄爲所有在這個片段中的應用：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions 
{ 

    float version = [[[UIDevice currentDevice] systemVersion] floatValue]; 
    if (version >= 5.0) 
    { 
     // iPhone 5.0 code here 
     UIImage *image = [UIImage imageNamed: @"btn_back.png"]; 
     image = [image stretchableImageWithLeftCapWidth:40.0f topCapHeight:0.0f]; 
     [[UIBarButtonItem appearance] setBackButtonBackgroundImage:image forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; 

    } 
    return YES; 
} 

我在stretchableImageWithLeftCapWidth一直在嘗試不同的值：但最好的結果是這樣的：

如何設置背景圖片，以正確的大小？

感謝

Answer 1

stretchableImageWithLeftCapWidth:topCapHeight:已被棄用。改爲使用resizableImageWithCapInsets:。

這應該工作：

UIImage *buttonImage = [[UIImage imageNamed:@"btn_back.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(1, 10, 1, 10)]; 
[[UIBarButtonItem appearance] setBackButtonBackgroundImage:buttonImage forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];