iPhone UINavigationBar - 設置rightBarButtonItem的寬度和邊距

Question

我有一個按鈕的背景圖像，尺寸爲80x30像素。

我用下面的代碼來設置我的視圖 - 控制器的背景下，其結果是這樣的：

正如你所看到的，四角和右鍵的頂部是亂七八糟向上。

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view. 

    UIImage *favoriteBtnImgNormal = [[UIImage imageNamed:@"favorite-btn-normal"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 30, 30, 0)]; 
    UIImage *favoriteBtnImgTouch = [[UIImage imageNamed:@"favorite-btn-touch"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 30, 30, 0)]; 

    [self.navigationItem.rightBarButtonItem setBackgroundImage:favoriteBtnImgNormal forState:UIControlStateNormal barMetrics:UIBarMetricsDefault]; 
    [self.navigationItem.rightBarButtonItem setBackgroundImage:favoriteBtnImgTouch forState:UIControlStateHighlighted barMetrics:UIBarMetricsDefault]; 
    [self.navigationItem.rightBarButtonItem setBackgroundImage:favoriteBtnImgTouch forState:UIControlStateSelected barMetrics:UIBarMetricsDefault]; 
    [self.navigationItem.rightBarButtonItem setTitlePositionAdjustment:UIOffsetMake(-10.0, 0.0) forBarMetrics:UIBarMetricsDefault]; 
} 

請注意，我在單個視圖控制器中執行此操作，我使用外觀API設置常規樣式。但在這裏我想覆蓋一般的外觀。

如果我剛剛得到的圖像，而不可調整大小-的東西，它看起來像這樣：

現在的棱角都很好，但按鈕過大。

我確定我這樣做都是錯誤的，所以我需要有人指出我能做些什麼來正確縮放按鈕？

Answer 1

UIImage *image = [UIImage imageNamed:@"YourImage"]; 
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom]; 

button.bounds = CGRectMake(0, 0, image.size.width, image.size.height); 

[button setImage:image forState:UIControlStateNormal]; 
[button addTarget:self action:@selector(YourAction) forControlEvents:UIControlEventTouchUpInside]; 

button.contentEdgeInsets = (UIEdgeInsets){.right=-10}; 

self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithCustomView:button] autorelease];