thanx in advance.

Now this is truly a good piece of code. ANYWAY, HERE IS A TRICKY ONE: Can anyone figure out how to get device orientation change to work? If I setup something like that :

CGRect frame;
frame.size.width=320; frame.size.height=480;
frame.origin.x=0; frame.origin.y=0;
AsyncImageView* asyncImage = [[[AsyncImageView alloc] initWithFrame:frame] autorelease];

and I am in portrait mode an image which is larger than 320×480 will be autoresizedtofit. good so far. but then when I turn the device into landscape mode the image stays in size (does not resize itself to autowidth) and it sits at the very left. its like the whole frame with its 320×480 is rotated and does not resize itself to the landscape mode.

Anybody a solution to that?

should you write out the usage of it in detail ?

Thank you for your help

Kan

In AsyncImageView.m, line 71, I’ve provided an alternative image if a cached image does not exist for the current cell.

//————existing code—————

if (imageCache == nil) // lazily create image cache
imageCache = [[ImageCache alloc] initWithMaxSize:2*1024*1024]; // 2 MB Image cache

[urlString release];
urlString = [[url absoluteString] copy];
UIImage *cachedImage = [imageCache imageForKey:urlString];
if (cachedImage != nil) {
if ([[self subviews] count] > 0) {
[[[self subviews] objectAtIndex:0] removeFromSuperview];
}
UIImageView *imageView = [[[UIImageView alloc] initWithImage:cachedImage] autorelease];
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.autoresizingMask =
UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self addSubview:imageView];
imageView.frame = self.bounds;
[imageView setNeedsLayout]; // is this necessary if superview gets setNeedsLayout?
[self setNeedsLayout];
return;
//———– Line 71 ————

} else {
// Use a default placeholder when no cached image is found
UIImageView *imageView = [[[UIImageView alloc] initWithImage:[UIImage
imageNamed:@"placeholder.png"]] autorelease];
imageView.contentMode = UIViewContentModeScaleAspectFit;
imageView.autoresizingMask =
UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self addSubview:imageView];
imageView.frame = self.bounds;
[imageView setNeedsLayout];
[self setNeedsLayout];
}

Be sure not to include a “return;” at the end of this else block or all your thumbs will be your default placeholder. You want the code to continue to run after you insert the placeholder.

Let me know if you find any problems!

Make sure to make the reference to these methods in the header files of the class specified.

First you will need to add a method to the ImageCache Class to empty the NSDictionary in that class something like this.

-(void)emptyCache{

[myDictionary removeAllObjects];

NSLog(@”all objects removed Cache has been empty”);
}

Second You will add an identical method in the AsyncImageView class.
like this

-(void)emptyImages{

[imageCache emptyCache]; // tells the image class to implement the empty cache method
}

And lastly in your TableViewController Class. in the dealloc method add this line of code between the brackets.

[asyncImage emptyImages];

I implement this when my table view gets deallocated although you might want to els ware

I hope this helps the code has not been fully tested for leaks but if I am missing something feel free to modify.

I’ve ported the code from Objective-C to MonoTouch (C#). Would you mind if I blogged about it, giving full reference to this site of course?

My question is for those of you using the yellojacket code. I would like to know how to empty the cache of the image objects. Within my view did disappear method of the table view’s delegate. Or in my app delegate’s did receive memory warning method.

The implementation of this would be greatly appreciated as I have slamming my head against the wall for about three days know trying to do this. I know it is something small that i’m just not doing properly. Thank you