ios - 在相机上捕获屏幕

Question

大家好。我想在出现相机时捕获屏幕截图。场景是我正在向相机添加叠加 View 。当用户调整相机并点击捕获按钮时。我想生成屏幕上的图像。我尝试使用 this 截屏代码但只有覆盖是捕获而不是图像。那就是相机是空白的。

我也看过 this回答

但它只捕获图像而不是叠加 View

Answer 1

您可以获取从 UIImagePickerController 接收的图像(在 didFinishPickingMediaWithInfo 方法中从委托(delegate)接收的图像)并将其与您的叠加 View 合并，如下所示:

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

    UIImage *cameraImage = The image captured by the camera;
    UIImage *overlayImage = Your overlay;
    UIImage *computedImage = nil;

    UIGraphicsBeginImageContextWithOptions(cameraImage.size, NO, 0.0f);
    [cameraImage drawInRect:CGRectMake(0, 0, cameraImage.size.width, cameraImage.size.height)];
    [overlayImage drawInRect:CGRectMake(0, 0, overlayImage.size.width, overlayImage.size.height)];

    computedImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    dispatch_async(dispatch_get_main_queue(), ^{
       // don't forget to go back to the main thread to access the UI again
    });
});

编辑:我添加了一些 dispatch_async 以避免阻塞 UI