在 iOS 中显示额外的 UINavigationBar？

Question

我遇到了 UINavigationBar 的问题，当我在那里添加 UIButton 并运行应用程序时，我可以在 UINavigationBar 顶部看到一个额外的 UINaviagtionBar 叠加层。

请帮忙

结构是这样的

UITabbarController -> UINavigationController -->UIViewController

我已附上截图链接

运行时间[![[1]][1]][1]

Xcode

[navigationcontroller->viewcontroller 屏幕][3]

代码

ViewDidAppear()

UIImage *myImage = [UIImage imageNamed:@"filter.png"];
UIButton *myButton = [UIButton buttonWithType:UIButtonTypeCustom];
[myButton setImage:myImage forState:UIControlStateNormal];
myButton.showsTouchWhenHighlighted = YES;
myButton.frame = CGRectMake(0.0, 0.0,25,25);
[myButton addTarget:self action:@selector(refreshSection) forControlEvents:UIControlEventTouchUpInside];
UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithCustomView:myButton];
self.navigationItem.leftBarButtonItem = rightButton;

UIImage *myImage1 = [UIImage imageNamed:@"Contacts.png"];
UIButton *myButton1 = [UIButton buttonWithType:UIButtonTypeCustom];
[myButton1 setImage:myImage1 forState:UIControlStateNormal];
myButton1.showsTouchWhenHighlighted = YES;
myButton1.frame = CGRectMake(0.0, 0.0,30,30);

[myButton1 addTarget:self action:@selector(profile) forControlEvents:UIControlEventTouchUpInside];

UIBarButtonItem *rightButton1 = [[UIBarButtonItem alloc] initWithCustomView:myButton1];
[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects:rightButton1, nil]];

full screen storyboard

Answer 1

我认为代码是正确的，只需设置 contentMode 属性。

[[myButton imageView] setContentMode: UIViewContentModeScaleAspectFit];

其他按钮也一样。

Answer 2

转到您的根导航控制器，选择导航栏并在属性检查器下，确保您有：

1. 默认样式，
2. 半透明选项已启用，
3. 默认条形色调。