Loading images to UIScrollview crashes
- by Icky
Hello All.
I have a Navigationcontroller pushing a UIViewController with a scrollview inside. Within the scrollview I download a certain number of images around 20 (sometimes more) each sized around 150 KB.
All these images are added to the scrollview so that their origin is x +imageSize and the following is sorted right to the one before.
All in all I think its a lot of data (3-4 MB).
On an I pod Touch this sometimes crashes, the IPhone can handle it once, if it has to load the data again (some other images) , it crashes too.
I guess its a memory issue but within my code, I download the image, save it to a file on the phone as NSData, read it again from file and add it to a UIImageview which I release. So I have freed the memory I allocated, nevertheless it still crashes.
Can anyone help me out? Since Im new to this, I dont know the best way to handle the Images in a scrollview.
Besides I create the controller at start from nib, which means I dont have to release it, since I dont use alloc - right?
Code:
In my rootviewcontroller I do:
-(void) showImages {
[[self naviController] pushViewController:imagesViewController animated:YES];
[imagesViewController viewWillAppear:YES];
}
Then in my Controller handling the scroll View, this is the method to load the images:
- (void) loadOldImageData {
for (int i = 0; i < 40 ; i++) {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"img%d.jpg", i]];
NSData *myImg = [NSData dataWithContentsOfFile:filePath];
UIImage *im = [UIImage imageWithData:myImg];
if([im isKindOfClass:[UIImage class]]) {
NSLog(@"IM EXISTS");
UIImageView *imgView = [[UIImageView alloc] initWithImage:im];
CGRect frame = CGRectMake(i*320, 0, 320, 416);
imgView.frame = frame;
[myScrollView addSubview:imgView];
[imgView release];
//NSLog(@"Adding img %d", i);
numberImages = i;
NSLog(@"setting numberofimages to %d", numberImages);
//NSLog(@"scroll subviews %d", [myScrollView.subviews count]);
}
}
myScrollView.contentSize = CGSizeMake(320 * (numberImages + 1), 416);
}
