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POimages not being added to NSMutableDictionary, which is within an NSOperation
 

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  1. POimages not being added to NSMutableDictionary, which is within an NSOperation
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    <p>So I first coded all my methods in a viewcontroller with an NSOperationQueue. After doing some research and a lot of reading I realized i had to subclass my loadImage operation so that I may use isCancelled and cancelAllOperations. So I went ahead and created an nsoperation class and called it from my viewcontroller. ALl the methods are called, even the imageLoaded, but the NSMutableDictionary remains empty. I use the dictionary to populate my tableviewcells using the url as the Key. Also be aware that the operation call in the viewcontroller is within a method which is called by an NSInvocationOperation when the view loads.</p> <pre><code>@interface loadImages : NSOperation { NSURL *targetURL; } @property(retain) NSURL *targetURL; - (id)initWithURL:(NSURL*)url; @end </code></pre> <p>implementation of nsoperation class which includes some other calls to resize the image</p> <pre><code>@implementation loadImages @synthesize targetURL; - (id)initWithURL:(NSURL*)url { if (![super init]) return nil; [self setTargetURL:url]; return self; } - (void)dealloc { [targetURL release], targetURL = nil; [super dealloc]; } - (void)main { NSLog(@"loadImages.m reached"); StoriesTableViewController *stories = [[StoriesTableViewController alloc] init]; NSMutableDictionary *tempDict = stories.filteredImagesDict; UIImage *myImage = [[[UIImage alloc] initWithData:[NSData dataWithContentsOfURL:[self targetURL]]]autorelease]; UIImage *scaledImage = [[[UIImage alloc] init] autorelease]; CGRect frame = CGRectMake(100.0f, 100.0f, 180.0f, 180.0f); UIImageView *myImageFrame = [[UIImageView alloc] initWithFrame:frame]; myImage = [[myImage croppedImage:[myImageFrame bounds]]retain]; scaledImage = [[myImage resizedImage:CGSizeMake(120.0f, 120.0f) interpolationQuality:kCGInterpolationHigh]retain]; [tempDict setValue:scaledImage forKey:[self targetURL]]; [stories performSelectorOnMainThread:@selector(imageLoaded:) withObject:myImage waitUntilDone:YES]; NSLog(@"targetURL %@",[self targetURL]); NSLog(@"tempDict count: %d",tempDict.count); [stories release]; [myImage release]; [myImageFrame release]; [scaledImage release]; } </code></pre> <p>creation of nsoperation on viewcontroller</p> <pre><code>for(int i=0;i&lt;storyQuantity;i++) { NSString *imageString = [[[storiesArray objectAtIndex:i] objectForKey: @"image"] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; // must add trimming to remove characters NSURL *url = [NSURL URLWithString:imageString]; loadImages *imageOperation = [[loadImages alloc] initWithURL:url]; [queue_ addOperation:imageOperation]; [imageOperation release]; } </code></pre>
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    1. USzambono
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      1. POimages not being added to NSMutableDictionary, which is within an NSOperation
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    1. COI'm a little confused as to why you are creating an view controller.
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      1. POimages not being added to NSMutableDictionary, which is within an NSOperation
      1. USDavid Beck
    2. COi started from scratch to get this to work
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