I want to display the infinite images in UITableView/UICollectionview, here the images will be received from remote server, I've done this by using GCD but it causes Memory issues and app got crash.Please help to fix it. Also I noticed some images aren't deallocated. Here is piece of code I've used to download images.
我想在UITableView / UICollectionview中显示无限图像,这里将从远程服务器接收图像,我通过使用GCD完成此操作,但它导致内存问题和应用程序崩溃。请帮助修复它。另外我注意到一些图像没有被释放。这是我用来下载图像的一段代码。
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData *data = [NSData dataWithContentsOfURL:url];
UIImage *image = [UIImage imageWithData:data];
NSData *imgData = UIImageJPEGRepresentation(image, 0.1);
UIImage *image1 = [UIImage imageWithData:imgData];
if (image1.size.width != 130 || image1.size.height != 100)
{
CGSize itemSize = CGSizeMake(130, 100);
UIGraphicsBeginImageContextWithOptions(itemSize, NO, 0.0f);
CGRect imageRect = CGRectMake(0.0, 0.0, itemSize.width, itemSize.height);
[image1 drawInRect:imageRect];
image1 = UIGraphicsGetImageFromCurrentImageContext();
[self setImage:image1 forKey:[url absoluteString]];
// NSLog(@" down Size of Image(bytes):%d",[imgData length]);
UIGraphicsEndImageContext();
}
dispatch_async(dispatch_get_main_queue(), ^{
completion(image1);
//image1=nil;
});
});
3 个解决方案
#1
you can work with: AFNetworking+UIImageView
你可以使用:AFNetworking + UIImageView
About the memory issues and crashes, be careful with the retain cycles, use the profiler/Instruments, if you want to continue with your code is good idea to change:
关于内存问题和崩溃,请注意保留周期,使用profiler / Instruments,如果要继续使用代码,最好更改:
__weak MyClassViewOrViewController* weakSelf = self;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
...
__strong MyClassViewOrViewController *strongSelf = weakSelf;
[strongSelf setImage:image1 forKey:[url absoluteString]];
...
});
Thanks,
J.
#2
You can do using LazyLoading Concept
您可以使用LazyLoading Concept
Reference: https://developer.apple.com/library/ios/samplecode/LazyTableImages/Introduction/Intro.html
#3
You can use SDWebImage to load infinite image, good performance, cache..
您可以使用SDWebImage加载无限图像,良好的性能,缓存..
#1
you can work with: AFNetworking+UIImageView
你可以使用:AFNetworking + UIImageView
About the memory issues and crashes, be careful with the retain cycles, use the profiler/Instruments, if you want to continue with your code is good idea to change:
关于内存问题和崩溃,请注意保留周期,使用profiler / Instruments,如果要继续使用代码,最好更改:
__weak MyClassViewOrViewController* weakSelf = self;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
...
__strong MyClassViewOrViewController *strongSelf = weakSelf;
[strongSelf setImage:image1 forKey:[url absoluteString]];
...
});
Thanks,
J.
#2
You can do using LazyLoading Concept
您可以使用LazyLoading Concept
Reference: https://developer.apple.com/library/ios/samplecode/LazyTableImages/Introduction/Intro.html
#3
You can use SDWebImage to load infinite image, good performance, cache..
您可以使用SDWebImage加载无限图像,良好的性能,缓存..