自定义按钮图像在导航栏 iOS 7.1 上不可见答案

【问题标题】：Custom button Image not visible on navigation bar iOS 7.1自定义按钮图像在导航栏 iOS 7.1 上不可见
【发布时间】：2014-05-06 04:35:31
【问题描述】：

我在导航栏上添加了自定义按钮。这是现在的代码，我的问题是在 iOS7 中我可以看到带有文本的按钮图像，而在 iOS 7.1 中，图像不显示，只显示文本。

-(void)addBackButton{

    self.navigationItem.hidesBackButton = YES;

    [backButtonView removeFromSuperview];

   if (backButtonView) {
       [backButtonView release];
      backButtonView = nil;
   }

    backButtonView = [[UIView alloc] initWithFrame:CGRectMake(0,6,70,30)];

    NSString *strText = @"Back";

     btnBack = [[UIButton alloc] initWithFrame:CGRectMake(2,0, 70, 31)];

     [btnBack setTitle:strText forState:UIControlStateNormal];
     btnBack.titleLabel.font = [UIFont fontWithName:@"HelveticaNeue-Medium" size:17];
     btnBack.titleLabel.textColor = IOS7ColorBtnBackText;
     [btnBack setImage:[UIImage imageNamed:@"Left_Arrow.png"] forState:UIControlStateNormal];

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

     [backButtonView addSubview:btnBack];
     [btnBack release];

      [self.navigationController.navigationBar addSubview:backButtonView];


}

【问题讨论】：

标签： iphone ios7 uinavigationcontroller uibarbuttonitem ios7.1

【解决方案1】：

您可以将自定义按钮分配给左或右按钮，而不是将其添加为导航视图中的子视图，这也有效

  UIButton *backbtn=[[UIButton alloc]initWithFrame:CGRectMake(20,5,42, 42)];
  [backbtn setImage:[UIImage imageNamed:@"arrow.png"] forState:UIControlStateNormal];
  [backbtn setTitle:@"Login" forState:UIControlStateNormal];
  [backbtn addTarget:self action:@selector(didTapBackButton:) forControlEvents:UIControlEventTouchUpInside];
  UIBarButtonItem *barbtn=[[UIBarButtonItem alloc]initWithCustomView:backbtn];
  self.navigationItem.leftBarButtonItem=barbtn;

【讨论】：

【解决方案2】：

[self.navigationItem setHidesBackButton:YES];

这确实有效，但你在这里犯了错误

[self.navigationController.navigationBar addSubview:backButtonView];

///// 您创建自定义按钮的代码放在这里

self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:BackButton];

【讨论】：

【解决方案3】：

创建自定义按钮并将其作为自定义视图添加到导航左栏按钮项中，如下所示：

let btnShowMenu = UIButton()
let image: UIImage = UIImage(named: "requiredImageName")!
btnShowMenu.setImage(image, for: UIControlState.normal)
btnShowMenu.frame = CGRect(x: 0, y: 0, width: 15, height: 15)
btnShowMenu.addTarget(self, action: #selector(addAnAction(_:)), for: UIControlEvents.touchUpInside)
let customBarItem = UIBarButtonItem(customView: btnShowMenu)
self.navigationItem.leftBarButtonItem = customBarItem;

【讨论】：