导航栏右边按钮（纯图片）

UIImage * image =IMAGENAMED(@"ser_query");
    image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    UIBarButtonItem *editItem = [[UIBarButtonItem alloc] initWithImage:image style:UIBarButtonItemStylePlain target:self action:nil];
    __weak typeof(self) weakSelf = self;
    [self addRightItem:editItem complete:^(UIBarButtonItem *item) {
        __strong typeof(weakSelf) strongSelf = weakSelf;
    }];
    [self.navigationItem setRightBarButtonItem:editItem];