ios - 自定义覆盖不透明

Question

我正在做一些相当简单的事情。我创建了一个简单的 NIB，其中只有一个分段控件。主要用于测试目的。我正在尝试使用此 NIB 加载到 UIImagePickerController 覆盖层中。但加载后，覆盖层不透明。仅显示白色背景和相机 View 顶部中心的按钮。我尝试了overlay.opaque = NO，但没有成功。

这是我的代码:

@property (nonatomic) IBOutlet UIView *viewTest;
@property (nonatomic, weak) IBOutlet UISegmentedControl *switchButtonTest;

后来，我有了这个方法(主要来自苹果的APLViewController示例

- (void)showImagePickerForSourceType:(UIImagePickerControllerSourceType)sourceType
{
    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
    imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;
    imagePickerController.sourceType = sourceType;
    imagePickerController.delegate = self;

    if (sourceType == UIImagePickerControllerSourceTypeCamera)
    {
        imagePickerController.showsCameraControls = NO;

        [[NSBundle mainBundle] loadNibNamed:@"ViewTest" owner:self options:nil];
        self.viewTest.frame = imagePickerController.cameraOverlayView.frame;
        imagePickerController.cameraOverlayView = self.viewTest;
        self.viewTest = nil;
    }

    self.imagePickerController = imagePickerController;
    [self presentViewController:self.imagePickerController animated:YES completion:nil];
}

Answer 1

要摆脱白色背景 View ，请将其颜色更改为 clearColor(或者一开始就不要使用它)。要使分段控件不那么不透明，请将其 alpha 设置为 0.2。