ios - 在相机上捕获屏幕

大家好我想在出现相机时捕获屏幕截图。场景是我向相机添加一个叠加视图。并且当用户调整摄像头和Tapp捕获按钮时。我想生成图像在屏幕上。我已经尝试过使用this代码进行屏幕截图，但是仅覆盖图像而不是图像。那是相机是空白的。

我也看到了this答案

但它仅捕获图像而不覆盖叠加视图

最佳答案

您可以获取从UIImagePickerController接收到的图像（从委托中在didFinishPickingMediaWithInfo方法中接收到的图像），并将其与叠加视图合并，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