我正试图向用户下载600多幅在屏幕上标有进展的坡道的图像。 我在展示活动和进展时,用微薄的层挡住我的屏幕。

我正在收到在坠毁之间的记忆警报信息。

我走到会堂的道路是:

1. On app delegate, I check first core data table for all rows which is having "0" value in isImageAvailable bool field.
2. If shows me some count (say 600), and I show and alert with YES and NO option.
3. On YES : [self performSelector:@selector(myDownload:) withObject:nil afterDelay:0.2];

4. 页: 1

   NSOperationQueue *queue = [NSOperationQueue new];
   // Create our NSInvocationOperation to call loadDataWithOperation, passing in nil 
   NSInvocationOperation *operation = [[NSInvocationOperation alloc] initWithTarget:self
                                                                    selector:@selector(startUpdatingRecords:) object:nil];
   
   // Add the operation to the queue 
   [queue addOperation:operation];
   [operation release];
   [queue release];
   

5. 一开始 更新记录:

   -(void)startUpdatingRecords:(id)sender 
   {    
   [self performSelectorInBackground:@selector(updateProgressMeter:) withObject:    [NSString stringWithFormat:@"%d",self.loopStartIndex]];
   
   // Variable declarations             
   CGSize newSizeLarge ;
   NSPredicate *predicate;
   NSMutableArray *MatchingID;
   Image_DB *data;
   
   // Cache Directory path
   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask,  YES);
   
   NSData *responseData; // = [[NSData alloc]init] ;
   
   NSURL *url = [[[NSURL alloc]init] autorelease];
   NSMutableURLRequest *request = [[[NSMutableURLRequest alloc]init] autorelease];
   UIImage *imgSelected_Large = [[[UIImage alloc]init] autorelease];
   
   // Loop through all IDs
   for (int i = 0; i < [self.arrayOfID count]; i++) //for (int i = loopStart; i < loopEnd; i++) 
   { 
   if (self.abortDownload)
   {           
       break;
   } 
   
   NSString *documentsDirectory = [[[NSString alloc] initWithFormat:@"%@",[paths objectAtIndex:0]] autorelease];
   documentsDirectory = [paths objectAtIndex:0];
   documentsDirectory = [documentsDirectory stringByAppendingFormat:@"/ImageFolder"]; // Image folder path
   
   myClass *classObj = [self.arrayOfID objectAtIndex:i];   
   
   NSString *strURl = [[[NSString alloc] initWithFormat:@"%@%@", self.MyURL,recipeObj.recipeImageStr] autorelease];
   //NSLog(@"URL = %@",strURl);           
   
   url = [NSURL URLWithString:strURl];
   request = [NSMutableURLRequest requestWithURL:url];
   responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:NULL error:NULL]; // Get Image Data into NSData
   
   //imgSelected_Large = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:strURl]]];
   
   NSLog(@"Download Count = %d",i+1);
   
   if (responseData != nil)
   {
       imgSelected_Large = [UIImage imageWithData:responseData];
   
       // Resizining image
       newSizeLarge.width = 320;    
       newSizeLarge.height = 180;     
   
       imgSelected_Large = [self imageWithImage:imgSelected_Large scaledToSize:newSizeLarge]; // New sized image
       NSData *dataPhoto; // no need to release it because UIImageJPEGRepresentation gives autoreleased NSData obj.
       dataPhoto  = UIImageJPEGRepresentation(imgSelected_Large, 0.6);  // Set new image representation and its Compression Quality
   
       documentsDirectory = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"Image_%d", classObj.nodeID]];            
       [dataPhoto writeToFile:documentsDirectory atomically:YES]; //Write file to local folder at default path
   
       predicate = [NSPredicate predicateWithFormat: @"(image_ID = %d )",recipeObj.nodeID];
       MatchingID = [CoreDataAPIMethods searchObjectsInContext:@"Image_DB" :predicate :@"image_ID" :YES :self.managedObjectContext];
   
       // Setting flag variable for available image
       for (int j = 0; j< [MatchingID count]; j++)
       {
           //Assign the Authors Records in Class Object and save to Database 
           data = (Image_DB*) [MatchingID objectAtIndex:j];                
           // data.image_large = dataPhoto; // Code for storing BLOB object to DB
           data.extra_1 = @"1";
           //NSLog(@"Flag updated");
       }
   }
   // Exit out code
   if ( i == [self.arrayOfID count] - 1 || i == [self.arrayOfID count]) // Its the last record to be stored
   {    
       NSError *error;             
       if (![self.managedObjectContext save:&error])
       {
           // Handle the error...
           NSLog(@"Error in updating %@",error);
       } 
   
       self.isUpdateImageCalled = NO;
       [self performSelectorOnMainThread:@selector(removeProgressMeter) withObject:nil waitUntilDone:NO];
   
   }
   // Update UI screen while in downloading process
   [self performSelectorInBackground:@selector(updateProgressMeter:) withObject:[NSString stringWithFormat:@"%d",self.loopStartIndex+i+1]];
   }
   }
   

如果我拿不出电回击Data,那么我的照片就显示我的记忆警示和失事。 如果我公布的话,[NSConcrete MutableData]:发送去处理01x1e931de0错误的信息就会出现。

如何完善我的法典。 任何人都可以就我的守则和工作建议我,并拟订一部经过改进的法典。

请帮助我。