iOS 修改NavigationBar的自定义按钮

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NavigationBar自定义返回按钮，并且设置距离

   UIBarButtonItem *leftItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back"] style:UIBarButtonItemStylePlain target:self action:@selector(backAction)];
    UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];
    spaceItem.width = 0;
    self.navigationItem.leftBarButtonItems = @[spaceItem,leftItem];

-(void)backAction
{
    [self.navigationController popViewControllerAnimated:YES];
}

如果距离过大，就去掉spaceItem这一项即可。