ios - SIGABRT 转换为 UIImage

Question

我正在使用 FastttCamera作为 AVFoundation 的包装器，用于拍摄、处理和显示图片。这是我将 (FastttCapturedImage *) 转换为 (UIImage *) 的代码(FastttCamera 委托(delegate)方法):

- (void)cameraController:(FastttCamera *)cameraController didFinishScalingCapturedImage:(FastttCapturedImage *)capturedImage
{
    //Use the captured image's data--note that the FastttCapturedImage is cast to a UIImage
    NSData *pngData = UIImagePNGRepresentation((UIImage *)capturedImage);

    //Save the image, and add the path to this transaction's picPath attribute
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsPath = [paths objectAtIndex:0]; //Get the docs directory

    int timestamp = [[NSDate date] timeIntervalSince1970];

    NSString *timeTag = [NSString stringWithFormat:@"%d",timestamp];

    NSString *filePath = [documentsPath stringByAppendingString:timeTag]; //Add the file name
    [pngData writeToFile:filePath atomically:YES]; //Write the file

    self.thisTransaction.picPath = filePath;

    [self.viewFinder setImage:(UIImage *)capturedImage];
}

但是，我在该行收到了一个 SIGABRT:

    NSData *pngData = UIImagePNGRepresentation((UIImage *)capturedImage);

使用此控制台读数:

 *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[FastttCapturedImage CGImage]: unrecognized selector sent to instance 0x17e2a100'

我对 CGImage 的引用感到困惑。我的类型转换有问题吗？没有关于构建的投诉。有人可以让我直截了当吗？

Answer 1

阅读 FastttCapturedImage 的文档。它不是 UIImage，所以你不能像那样转换它。使用提供的属性获取 UIImage。

将有问题的行更改为:

NSData *pngData = UIImagePNGRepresentation(capturedImage.fullImage);

你以后遇到同样的问题:

[self.viewFinder setImage:capturedImage.fullImage];

顺便说一句 - 你在编译时没有遇到问题，因为强制转换是一种告诉编译器“相信我，这真的是我告诉你的”的方式。这里的问题是你错了，这不是你声称的那样。 :)