iOS 修改系统返回键

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[[UIBarButtonItem appearance] setTitleTextAttributes:@{NSForegroundColorAttributeName: [UIColor clearColor]} forState:UIControlStateNormal];

         

  //下面这两句是让系统的返回按钮的文字为空,从而达到隐藏文字的作用

        

   UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];

[self.navigationBar setBackIndicatorImage:[[UIImage imageNamed:@"navback"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal] ];

              

[self.navigationBar setBackIndicatorTransitionMaskImage:[[UIImage imageNamed:@"navback"]imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal]];

// UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil]; 切换的时候出现tittle

 //self.navigationBar.topItem.title = @"";
         

  [self.navigationBar setTintColor:[UIColor clearColor]];
           

self.navigationItem.backBarButtonItem.width =10;
          

self.navigationItem.backBarButtonItem = backItem;