iphone - 导航栏后退按钮，文本不居中对齐

Question

我正在使用外观代理自定义导航栏中的后退按钮，还设置图像和文本属性。一切正常，但后退按钮中的文本未居中对齐。

这是我的代码。

UIBarButtonItem *backButton = [[[UIBarButtonItem alloc] initWithTitle:title style:UIBarButtonItemStyleBordered target:nil action:nil] autorelease];
 UIImage *buttonBack32 = [[UIImage imageNamed:@"NavigationBackButton"] 
                         resizableImageWithCapInsets:UIEdgeInsetsMake(0, 10, 0, 5)];

[[UIBarButtonItem appearance] setBackButtonBackgroundImage:buttonBack32 forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
 [[UIBarButtonItem appearance] setTitleTextAttributes:
 [NSDictionary dictionaryWithObjectsAndKeys:
        [UIColor whiteColor], 
        UITextAttributeTextColor, 
        [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.8], 
        UITextAttributeTextShadowColor, 
        [NSValue valueWithUIOffset:UIOffsetMake(0, -1)], 
        UITextAttributeTextShadowOffset,
  [UIFont fontWithName:@"xxx" size:16.0], 
  UITextAttributeFont,
  nil] 
                                            forState:UIControlStateNormal]; 
self.navigationItem.backBarButtonItem = backButton;

如果我将字体大小设置为“0.0”，那么文本会变得太小并且仍然没有居中对齐。

提前感谢您的帮助。

Answer 1

您可以使用 setTitlePositionAdjustment:forBarMetrics: 方法根据需要设置标题偏移量。例如：

[[UIBarButtonItem appearance] setTitlePositionAdjustment:UIOffsetMake(0.0f, 5.0f) forBarMetrics:UIBarMetricsDefault];

Answer 2

要向上调整文本，我必须使用它：

    [[UIBarButtonItem appearance] setBackButtonTitlePositionAdjustment:UIOffsetMake(0, -1.5) forBarMetrics:UIBarMetricsDefault];

Answer 3

You can use this :

UIView* leftContainer = [[UIView alloc] initWithFrame:CGRectMake(0.0, 4.0, 70.0, 44.0)];
UIImage *profileImg = [UIImage imageNamed:@"account-btn.png"];
UIButton *profilebutton = [UIButton buttonWithType:UIButtonTypeCustom];
profilebutton.frame = CGRectMake(0.0, 7.0, 70.0, 30.0 );
[profilebutton setImage:profileImg forState:UIControlStateNormal];
[profilebutton addTarget:self action:@selector(profileBtnClicked) forControlEvents:UIControlEventTouchUpInside];
[leftContainer addSubview:profilebutton];

UIBarButtonItem* item = [[UIBarButtonItem alloc] initWithCustomView:leftContainer];
self.navigationItem.leftBarButtonItem = item;

[leftContainer release];
[item release];