2

編集の答え:

- (UIImage*) maskImage:(UIImageView *)maskImage withMask:(UIImageView *)cropImage
{

    UIImage *image = nil;
    UIImage *imagePNG = nil;

    CGSize newImageSize = CGSizeMake(cropImage.frame.size.width, cropImage.frame.size.height);

    UIGraphicsBeginImageContextWithOptions(newImageSize, NO, 0.0); //retina res
    [self.viewForImg.layer renderInContext:UIGraphicsGetCurrentContext()];

    image = UIGraphicsGetImageFromCurrentImageContext();


    NSData *imgData =  UIImagePNGRepresentation ( image ); // get PNG representation
    imagePNG = [UIImage imageWithData:imgData]; // wrap UIImage around PNG representation
    UIGraphicsEndImageContext(); 
    return imagePNG;
}

iPhoneの画面をスクリーンショットして、写真をカメラロールに保存しようとしました。しかし、このエラーが発生しました。私のコードに問題があるかどうか誰でも知っていますか?

May 22 14:13:34 unknown assetsd[281] <Error>: ImageIO: CGImageDestinationAddImage image parameter is nil
May 22 14:13:34 unknown assetsd[281] <Error>: ImageIO: CGImageDestinationFinalize image destination does not have enough images
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextScaleCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextSetBaseCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextSaveGState: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextSetInterpolationQuality: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextScaleCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextSetFillColorWithColor: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextFillRects: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextTranslateCTM: invalid context 0x0
May 22 14:13:34 unknown assetsd[281] <Error>: CGContextScaleCTM: invalid context 0x0

コード：

- (IBAction)saveImage:(id)sender {

    self.imageOverlay.alpha = 1;
    self.savedImage = [self maskImage:self.imgView withMask:self.baseImgView];

    UIImageWriteToSavedPhotosAlbum(self.savedImage, self, @selector(imageSavedToPhotosAlbum: didFinishSavingWithError: contextInfo:), nil);
}


- (UIImage*) maskImage:(UIImageView *)maskImage withMask:(UIImageView *)cropImage
{

    UIImage *image = nil;
    UIImage *imagePNG = nil;

    CGSize newImageSize = CGSizeMake(cropImage.frame.size.width, cropImage.frame.size.height);

    UIGraphicsBeginImageContextWithOptions(newImageSize, NO, 0.0); //retina res
    [self.viewForImg.layer renderInContext:UIGraphicsGetCurrentContext()];

    image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext(); 

    NSData *imgData =  UIImagePNGRepresentation ( image ); // get PNG representation
    imagePNG = [UIImage imageWithData:imgData]; // wrap UIImage around PNG representation

    return imagePNG;
}
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1 に答える 1

2

これは、CGSize渡したUIGraphicsBeginImageContextWithOptionsがである場合に発生する可能性がありますCGSizeZero。引数cropImageはどちらかであるかnil、そのサイズはCGSizeZeroです。デバッグして、すべてのオブジェクトが初期化され、正しいフレームになっていることを確認してください。

于 2012-05-22T07:06:27.820 に答える