自定义导航条返回按钮

-(void)setBarWithTitle:(NSString *)title{

self.view.backgroundColor=[UIColor whiteColor];

self.title=title;

self.navigationController.navigationBar.titleTextAttributes=@{NSForegroundColorAttributeName : [UIColor whiteColor]};

UIImage *image=[[UIImage imageNamed:@"Return"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

UIBarButtonItem *leftItem=[[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStylePlain target:self action:@selector(back)];

[leftItem setImage:image];

self.navigationItem.leftBarButtonItem=leftItem;

}

-(void)setBackItem{

UIImage *image=[[UIImage imageNamed:@"Return"] imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];

UIBarButtonItem *leftItem=[[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStylePlain target:self action:@selector(back)];

[leftItem setImage:image];

self.navigationItem.leftBarButtonItem=leftItem;

}

-(void)back{

[self.navigationController popViewControllerAnimated:YES];

}