Dynamic image height in tableview with using sdwebimage - ios

Question

I want dynamic height image show in tableview, image is come from url so I am using the sdwebimage.
Sdwebimage set image in background thread.
[self.imageView sd_setImageWithURL:[NSURL URLWithString: encodedurl1] completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
}];
I am update the constraint height of image view in this thread.
[self.imageView sd_setImageWithURL:[NSURL URLWithString: encodedurl1] completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
CGFloat multiplier = (CGRectGetWidth(self.imageView.bounds) / image.size.width);
[self.imageViewHeightConstraint setConstant:multiplier * image.size.height];
}];
This code is helpful for me but I get image size in background thread
So, I take a time to update the height of constraint image view
I am search and goggling last 2 days.
This type issue get many developer, but not answer in any question in stack overflow.

Answer 1

do the update in main thread like
[self.imageView sd_setImageWithURL:[NSURL URLWithString: encodedurl1] completed:^(UIImage * _Nullable image, NSError * _Nullable error, SDImageCacheType cacheType, NSURL * _Nullable imageURL) {
dispatch_async(dispatch_get_main_queue(), ^{
CGFloat multiplier = (CGRectGetWidth(self.imageView.bounds) / image.size.width);
[self.imageViewHeightConstraint setConstant:multiplier * image.size.height];
[self setNeedsUpdateConstraints];
});
}];

Answer 2

Try this Helper method which created for my project.
-(void)imageWithURL:(NSURL *)imageurl WithIndexPath:(NSIndexPath *)indexpath WithCallback:(void(^)(UIImage *downloadedImage,BOOL isCache , NSIndexPath *imageIndexPath))callback{
if (![[SDWebImageManager sharedManager ]diskImageExistsForURL:imageurl]) {
[[SDWebImageManager sharedManager]downloadImageWithURL:imageurl options:0 progress:nil completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, BOOL finished, NSURL *imageURL) {
// resize image here
callback(image , NO,indexpath);
}];
}
else{
UIImage *image = [[SDImageCache sharedImageCache] imageFromDiskCacheForKey:[imageurl absoluteString]] ;
// resize image here
callback(image, YES ,indexpath);
}
}
Call this method in cellForRowAtIndexPath
dispatch_async( dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self imageWithURL:[NSURL URLWithString:objPreparations.strImageURL] WithIndexPath:indexPath WithCallback:^(UIImage *downloadedImage, BOOL isCache, NSIndexPath *imageIndexPath) {
if (downloadedImage) {
dispatch_async( dispatch_get_main_queue(), ^{
UITableViewCell *existcell = [tableView cellForRowAtIndexPath:imageIndexPath];
if (existcell) {
// assign image to cell here
[tableView reloadRowsAtIndexPaths:#[imageIndexPath] withRowAnimation:UITableViewRowAnimationNone];
}
});
}
}];
});
Dont Forgot
In viewDidLoad
tblView.estimatedRowHeight = 44.0 ;
tblView.rowHeight = UITableViewAutomaticDimension;
And also Give top,bottom,leading,trailing constraints to imageview and greater than equal height constraint to imageview