学步园

   有些时候，我们需要将leftBarButtonItem使用图片代替文字如“菜单”按钮，可以使用如下代码即可实现

 UIButton *TastoVersamento = [UIButton buttonWithType:UIButtonTypeCustom];

 [TastoVersamento setImage:[UIImage imageNamed:@"ICON_menu"] forState:UIControlStateNormal];

 [TastoVersamento addTarget:self action:@selector(showMenu:) forControlEvents:UIControlEventTouchUpInside];

 [TastoVersamento setFrame:CGRectMake(0, 0, 40, 40)];

 viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:TastoVersamento];