iOS 7 : Custom Back Indicator Image Position

Question

我在正确设置自定义后退指示器图像时遇到问题。指示器不居中!

这是一张图片:

我在 didFinishLaunchingWithOptions: 方法中设置指示器图像...

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

   UIImage *image = [UIImage imageNamed:@"Back"];
   [UINavigationBar appearance].backIndicatorImage = image;
   [UINavigationBar appearance].backIndicatorTransitionMaskImage = image;

   return YES;
}

我怎样才能居中呢？

p.s 我已经读过这个 Custom back indicator image in iOS 7 not vertically centered ，但实际上它对我不起作用。

Answer 1

 UIEdgeInsets insets = UIEdgeInsetsMake(0, 0, 2, 0);
 UIImage *backArrowImage = [[UIImage imageNamed:@"Back"] imageWithAlignmentRectInsets:insets];

 [[UINavigationBar appearance] setBackIndicatorImage:backArrowImage];
 [[UINavigationBar appearance] setBackIndicatorTransitionMaskImage:backArrowImage];