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iOSギャラリーから10枚の画像を選んですべての画像のQRコードを生成し、バックグラウンドスレッドを使用して文書ディレクトリにすべて保存するアプリを開発していますが、私がタブバーを変更すると、処理を開始した後、別のタブバービューに移動してバックグラウンドスレッドを停止し、3つまたは4つの保存された画像しか取得できないということになります。私はNSOperationQueueを使用して別のクラスを作って保存しようとしましたが成功しなかったように、これを実現するために別の異なるバックグラウンド関数を使用しました。コード私は使用しました：画像をQRコードでバックグラウンドスレッドの文書ディレクトリに保存
- (void)elcImagePickerController:(ELCImagePickerController *)picker didFinishPickingMediaWithInfo:(NSArray *)info
{
NSLog(@"%@",info);
[self dismissViewControllerAnimated:YES completion:nil];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), ^{
[self saveallD:info];
dispatch_async(dispatch_get_main_queue(), ^{
});
});
}
-(void)saveallD:(NSArray*)info
{
// int i=0;
for (NSDictionary *dict in info)
{
if ([dict objectForKey:UIImagePickerControllerMediaType] == ALAssetTypePhoto)
{
// i++;
if ([dict objectForKey:UIImagePickerControllerOriginalImage])
{
UIImage* chosenImage=[dict objectForKey:UIImagePickerControllerOriginalImage];
NSData *imageData = UIImagePNGRepresentation(chosenImage);
CGFloat scale= (100*1024)/(CGFloat)[imageData length]; // For 100KB.
UIImage *small_image=[UIImage imageWithCGImage:chosenImage.CGImage scale:scale orientation:chosenImage.imageOrientation];
NSData *imagefinaldata = UIImageJPEGRepresentation(small_image, scale*1.00);
//UIImage *imgCompressed = [self compressImage:chosenImage];
//NSData *imagefinaldata = UIImagePNGRepresentation(imgCompressed);
BOOL qrcodedetected = NO;
[[NSUserDefaults standardUserDefaults] setObject:imagefinaldata forKey:@"imagesaved"];
// QRCode detector
NSDictionary *detectorOptions = @{ CIDetectorAccuracy : CIDetectorAccuracyHigh };
CIDetector *faceDetector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:detectorOptions];
NSArray *features = [faceDetector featuresInImage:chosenImage.CIImage];
CIQRCodeFeature *faceFeature;
for(faceFeature in features)
{
qrcodedetected = YES;
self.decodedstr = [NSString stringWithFormat:@"%@",faceFeature.messageString];
break;
}
if (!qrcodedetected)
{
int timestamp = [[NSDate date] timeIntervalSince1970];
NSString*selectedFolder=[[NSUserDefaults standardUserDefaults] valueForKey:@"SelectedFolder"];
if ([selectedFolder isEqualToString:@""] || [selectedFolder isKindOfClass:[NSNull class]] || selectedFolder.length==0)
{
[email protected]"Default";
}
//dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 2), ^{
// time-consuming task
NSLog(@"basepath..%@",[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]);
NSString *stringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:[NSString stringWithFormat:@"%@",selectedFolder]];
//NSString *QRstringPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"QRimages"];
if ([[NSFileManager defaultManager] fileExistsAtPath:stringPath])
{
// [imagefinaldata writeToFile:savedImagePath atomically:NO];
// stringPath = [stringPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%d",timestamp]];
NSString *stringPath2 = [stringPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%d",timestamp]];
NSString *savedImagePath = [stringPath2 stringByAppendingPathComponent:[NSString stringWithFormat:@"%d.png",timestamp]];
[self writeImageToFile:stringPath2 :savedImagePath :imagefinaldata];
NSString *savedAudioPath = [stringPath2 stringByAppendingPathComponent:[NSString stringWithFormat:@"%d.m4a",timestamp]];
//NSData*recordedAudioData=[NSData dataWithContentsOfURL:_recorder.url];
if ([autoRecordingCheck isEqualToString:@"ON"])
{
[self writeAudioToFile:stringPath2 :savedAudioPath];
}
}
else
{
[[NSFileManager defaultManager]createDirectoryAtPath:stringPath withIntermediateDirectories:NO attributes:nil error:nil];
NSString *stringPath2 = [stringPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%d",timestamp]];
NSString *savedImagePath = [stringPath2 stringByAppendingPathComponent:[NSString stringWithFormat:@"%d.png",timestamp]];
[self writeImageToFile:stringPath2 :savedImagePath :imagefinaldata];
NSString *savedAudioPath = [stringPath2 stringByAppendingPathComponent:[NSString stringWithFormat:@"%d.m4a",timestamp]];
//NSData*recordedAudioData=[NSData dataWithContentsOfURL:_recorder.url];
if ([autoRecordingCheck isEqualToString:@"ON"])
{
[self writeAudioToFile:stringPath2 :savedAudioPath];
}
// [imagefinaldata writeToFile:savedImagePath atomically:NO];
}
NSString *savedImagePath = [stringPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%d.png",timestamp]];
CIFilter *filter = [CIFilter filterWithName:@"CIQRCodeGenerator"];
[filter setDefaults];
NSData *data = [savedImagePath dataUsingEncoding:NSUTF8StringEncoding];
[filter setValue:data forKey:@"inputMessage"];
CIImage *outputImage = [filter outputImage];
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgImage = [context createCGImage:outputImage
fromRect:[outputImage extent]];
UIImage *image = [UIImage imageWithCGImage:cgImage
scale:1.0
orientation:UIImageOrientationUp];
// Resize without interpolating
UIImage *resized = [self resizeImage:image
withQuality:kCGInterpolationNone
rate:5.0];
NSData* QRdata = UIImagePNGRepresentation(resized);
NSString *stringPath2 = [stringPath stringByAppendingPathComponent:[NSString stringWithFormat:@"%d",timestamp]];
NSString *savedImagePath2 = [stringPath2 stringByAppendingPathComponent:[NSString stringWithFormat:@"QR%d.png",timestamp]];
[self writeQRToFile:stringPath2 :savedImagePath2 :QRdata];
// [self performSegueWithIdentifier:@"addfilters" sender:nil];
// dispatch_async(dispatch_get_main_queue(), ^{
// [SVProgressHUD dismiss];
// });
//
// });
}
else
{
[self galleryalert];
}
}
}
else
{
NSLog(@"UIImagePickerControllerReferenceURL = %@", dict);
}
}
誰かが解決策を持っている場合は、私に知らせてください。それは高く評価されるだろう。前もって感謝します！
完了するとコールバックを得るためにあなたのビューコントローラでBackgroundOperationDelegate方法verrideシングルトン – Sanniv
@Sannivを試すことができます。ありがとう！ – Vishal