ios - save image with QRCode in document directory in background thread -
i developing app in have picked 10 images ios gallery , generate qrcode of images , save in document directory using background thread problem when change tab bar means after processing start when move tab bar view background thread stop , 3 or 4 stored images. have used different different background function achive have used nsoperationqueue made separate class tried save not succeeded. code have used:
- (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; (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]; // 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 ) { selectedfolder=@"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); } } if have type of solution please let me know. appreciated. in advance!
here code talking about. make changes per need.
backgroundoperation.h
@protocol backgroundoperationdelegate <nsobject> -(void)operationcompleted; -(void)operationinterrupted; @end @interface backgroundoperation : nsobject @property (nonatomic, weak) id<backgroundoperationdelegate> delegate; +(backgroundoperation*)sharedinstance; -(void)savealld:(nsarray*)info; @end backgroundoperation.m
#import "backgroundoperation.h" @implementation backgroundoperation static backgroundoperation *_sharedinstance = nil; +(backgroundoperation*)sharedinstance{ if(_sharedinstance == nil){ _sharedinstance = [[backgroundoperation alloc] init]; } return _sharedinstance; } - (id)init { if(self = [super init]) { } return self; } -(void)savealld:(nsarray*)infoarray { int i=0; nsarray *info = [nsarray arraywitharray:infoarray]; (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]; // 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 ) { selectedfolder=@"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); } } if(i+1==info.count) { [self.delegate operationcompleted]; } else { [self.delegate operationinterrupted]; } } @end you can make call below in viewcontroller
- (void)elcimagepickercontroller:(elcimagepickercontroller *)picker didfinishpickingmediawithinfo:(nsarray *)info { nslog(@"%@",info); [self dismissviewcontrolleranimated:yes completion:nil]; [[backgroundoperation sharedinstance] setdelegate:self]; [[backgroundoperation sharedinstance] savealld:info]; } make sure override backgroundoperationdelegate methods in view controller callbacks once task completed
Comments
Post a Comment