Ios UIbarButton图像不显示？

我已经创建了三个UIBarButton项，并将它们添加到UINavigation控制器中

如果我使用以下代码设置按钮的图像，则按钮可以正常工作并显示：

[saveSearchButton setImage:[UIImage imageNamed:@"Save Search"]];

然后我想让它在点击按钮时，它的图像变成“选定图像”

我是这样做的：

[butt setBackgroundImage:[UIImage imageNamed:@"myImage"] forState:UIControlStateSelected style:UIBarButtonItemStylePlain barMetrics:UIBarMetricsDefault];

但是，当我点击按钮时，它的图像没有改变（尽管调用了它的action方法）

我尝试将其图像设置为正常状态，如下所示：

[buttonOne setBackgroundImage:[UIImage imageNamed:@"myImage"] forState:UIControlStateNormal style:UIBarButtonItemStylePlain barMetrics:UIBarMetricsDefault];

当我使用上述代码时，按钮不再可见。如何更改按钮的选定图像

下面是我如何将按钮添加到UINavigationBar的完整代码

创建它们

UIBarButtonItem *buttonOne = [[UIBarButtonItem alloc]initWithTitle:nil style:UIBarButtonItemStylePlain target:self action:@selector(buttonOnePressed)];
    UIBarButtonItem *buttonTwo = [[UIBarButtonItem alloc]initWithTitle:nil style:UIBarButtonItemStylePlain target:self action:@selector(buttonTwoPressed)];
    UIBarButtonItem *buttonThree = [[UIBarButtonItem alloc]initWithTitle:nil style:UIBarButtonItemStylePlain target:self action:@selector(buttonThreePressed)];

添加到数组中

NSArray *barButtonItems = @[buttonOne,buttonTwo,buttonThree,];

添加到导航项

self.navigationItem.rightBarButtonItems = barButtonItems;

---

请尝试以下代码：

UIButton *button = [[UIButton alloc] init];

[button setImage:[UIImage imageNamed:@"myImage.png"] forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonOnePressed:)
    forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *barButton = [[UIBarButtonItem alloc]
                           initWithCustomView:button];

self.navigationItem.rightBarButtonItem = barButton;