I'm trying to get an image from a local url using AFNetworking with this code:
NSString *path = [DOCUMENTS stringByAppendingPathComponent:[NSString stringWithString:#"My Image.png"]];
[cell.imageView setImageWithURLRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:path]] placeholderImage:[UIImage imageNamed:#"Placeholder Image.png"] success:nil failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
NSLog(#"%s: setImageWithURLRequest error: %#", __FUNCTION__, error);
}];
and I am getting this error:
NSErrorFailingURLKey=/var/mobile/Applications/6D878789-640E-4299-AA72-45D49211492D/Documents/My Image.png, NSLocalizedDescription=unsupported URL, NSUnderlyingError=0x15df8b60 "unsupported URL"}
How can I do this with AFNetworking?
Try not setting the success block to nil and use this code:
[cell.myImage setImageWithURLRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:#"url"]] placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image)
{
weakimageView.image = image;
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error)
{
//Deal with failure
}];
Try this it works perfectly fine,..
Download UIImageView+webcache.h and .m file and add to your project.
link is here https://github.com/rs/SDWebImage/blob/master/SDWebImage/UIImageView%2BWebCache.h
NSString *path = [DOCUMENTS stringByAppendingPathComponent:[NSString stringWithString:#"My Image.png"]];
[cell.imageView setImageWithURL:[NSURLRequest requestWithURL:[NSURL URLWithString:path]] placeholderImage:[UIImage imageNamed:#"Placeholder Image.png"]];
or using Blocks,
NSString *path = [DOCUMENTS stringByAppendingPathComponent:[NSString stringWithString:#"My Image.png"]];
[cell.imageView setImageWithURL:[NSURLRequest requestWithURL:[NSURL URLWithString:path]] placeholderImage:[UIImage imageNamed:#"Placeholder Image.png"] success:^(UIImage *image, BOOL cached) {
<#code#> ---> if success
} failure:^(NSError *error) {
<#code#> ---> if failure
}];
Related
So I am working on a project and I must use AFImageDownloader in order to download some images that we need to use in our project. I use the following code:
-(void) downloadImage:(NSURL*) url
{
AFHTTPSessionManager *sessionManager = [[AFHTTPSessionManager alloc] init];
AFImageDownloader *imgDownloader = [[AFImageDownloader alloc] initWithSessionManager:sessionManager downloadPrioritization:AFImageDownloadPrioritizationFIFO maximumActiveDownloads:1 imageCache:nil];
AFHTTPResponseSerializer *responseSerializer = [AFHTTPResponseSerializer serializer];
responseSerializer.acceptableContentTypes = [NSSet setWithObjects:#"application/json", #"text/json",#"binary/octet-stream",nil];
sessionManager.responseSerializer = responseSerializer;
NSURLRequest *req = [NSURLRequest requestWithURL:url];
[imgDownloader downloadImageForURLRequest:req success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *responseObject){
self.image = responseObject;
[self.delegate updateImageWithImage:self.image]; // ** CRASH **
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error){
NSLog(#"Error");
}];
}
The delegate is of course not nil and code of the updateImageWithImage is:
-(void) updateImageWithImage:(UIImage*) img {
self.image.image = img;
}
So basically when I try to get the UIImage I get it as a response and assign it to the UICollectionViewCell and it crashes! I guess that I should do some kind of "copy" of the responseObject before using it in order parts of my program, but I am not really sure what the problem is. Any ideas?
I figured it out. I was basically using AFImagedownloader wrong, this is the proper way to use this Class:
[self.imageView setImageWithURLRequest:jpegURLRequest
placeholderImage:placeholder
success:^(NSURLRequest *request, NSHTTPURLResponse * _Nullable response, UIImage *image){
NSLog(#"Success");
completionBlock(image);
}
failure:^(NSURLRequest * _Nonnull request, NSHTTPURLResponse * _Nullable response, NSError * _Nonnull error) {
NSLog(#"ERROR!!!");
}];
I am new in iOS world.I am reading tutorial on afnetworking but i have some issue while i have to fetch images from server.I follow this tutorial :-
https://www.raywenderlich.com/59255/afnetworking-2-0-tutorial
I got error when i write this code :-
[cell.imageView setImageWithURLRequest:request
placeholderImage:placeholderImage
success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image)
error message :- no visible #interface for declares the selector setImageWithURLRequest such....
I have already import "UIImageView+AFNetworking.h"
Please help or provide me some link where i can learn fetch and uploading images to/from via Afnetworking.
You can try this one
[cell.imageView setImageWithURLRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:imageUrl]] placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
if (weakCell)
{
weakCell.imageView.image = image;
[weakCell setNeedsLayout];
}
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
NSLog(#"Error: %#", error);
}];
I'm using this code when downloading images in one of my current projects and it's not working with AFNetworking 2.0. I tried going thru AFImageResponseSerializer but I can't find the right code to use.
[cell.posterImage setImageWithURLRequest:urlRequest placeholderImage:[UIImage imageNamed:#"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
cell.posterImage.image = image;
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
NSLog(#"Request failed with error: %#", error);
}];
Any suggestions on the new code used in AFNetworking 2.0? Thanks!
I made it work using this code:
AFHTTPRequestOperation *posterOperation = [[AFHTTPRequestOperation alloc] initWithRequest:urlRequest];
posterOperation.responseSerializer = [AFImageResponseSerializer serializer];
[posterOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
NSLog(#"Response: %#", responseObject);
_posterImageView.image = responseObject;
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"Image request failed with error: %#", error);
}];
[[NSOperationQueue mainQueue] addOperation:posterOperation];
[posterOperation start];
But I got into another problem with placeholder images using this. Any ideas?
You're looking for UIImageView (AFNetworking) category.
#import "UIImageView+AFNetworking.h"
//...
[cell.posterImage setImageWithURLRequest:urlRequest placeholderImage:[UIImage imageNamed:#"placeholder.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
cell.posterImage.image = image;
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
NSLog(#"Request failed with error: %#", error);
}];
cell.posterImage must be an UIImageView not an UIImage.
With the updated AFNetworking 2.0 (in case your files are accessible for download-only basis, so are not accessible by a simple URL) :
NSString * methodURL = #"http://www.yourserver.com/pathToImageDownloadMethod";
NSInteger someIDYouHaveOfAnImage = 13;
AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];
manager.responseSerializer = [AFImageResponseSerializer serializer];
NSDictionary * parameterDictionary = #{#"Parameter" : [NSNumber numberWithInteger:someIDYouHaveOfAnImage]};
[manager GET:methodURL parameters:parameterDictionary success:^(AFHTTPRequestOperation *operation, id responseObject) {
if ([responseObject isKindOfClass:[UIImage class]]) {
UIImage * image = responseObject;
// Here is your image object
}
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
NSLog(#"failure getting the file : %#", error.localizedDescription);
}];
Hope it helps.
https://github.com/AFNetworking/AFNetworking/archive/master.zip is including UIKit+AFNetworking directory
I am implementing a code that downloads images and saves them in the database of the app,
I have an array of objects, each object contains the image url and some other information. To Download the images I'm using the class library AFImageRequestOperation.h AFNetworking.
My code downloads and saves the data in the database, but need to notify the user which image is downloaded, eg: if I have an array containing 5 objects (quoted just above what each object), will have to do downloading the same order that is in the array, but as AFImageRequestOperation makes downloading asynchronously item 4 can be downloaded before the first item.
In short, I want to have control and only release for the next download when the previous one is completed.
I have a for that runs through the array of objects and calls a function for each position, the function has the following code:
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[arrImagem valueForKey:#"urlimagem"]]];
AFImageRequestOperation *operation = [AFImageRequestOperation imageRequestOperationWithRequest:request imageProcessingBlock:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image){
Imagens *imagem = (Imagens *)[NSEntityDescription insertNewObjectForEntityForName:#"IMAGENS" inManagedObjectContext:managedObjectContext];
// Save Image
NSData *imageData = UIImageJPEGRepresentation(image, 90);
[imagem setCategoria:cat];
[imagem setTitulo:[arrImagem valueForKey:#"titulo"]];
[imagem setDescricao:[arrImagem valueForKey:#"descricao"]];
[imagem setImagem:imageData];
NSError *error;
if(![managedObjectContext save:&error]){
NSLog(#"houve um erro muito grave");
//return false;
}else{
NSLog(#"Salvou imagem");
}
}failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error){
NSLog(#"%#", [error localizedDescription]);
}];
[operation start];
I do not know if my question was very clear, but basically my question is similar to this link
AFImageRequestOperation is a subclass of NSOperation so you can use:
- (void) addDependency: (NSOperation*) operation
to make sure that one operation finishes before the other.
For example:
NSOperation *op1 = [[NSOperation alloc]init];
NSOperation *op2 = [[NSOperation alloc]init];
[op1 addDependency: op2];
This way op1 won't start before op2 is finished.
You can create a method in your class where you call the download code and add a block as parameter which receives the downloaded UIImage, the image url (and other infos that you need) or you can implement a delegate with the same params from the block. It can lock something like:
-(void)downloadImageWithSuccess:(void (^)(UIImage *image, NSString *url, OtherParms here))success
failure:(void (^)(NSError *error)failure {
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:[arrImagem valueForKey:#"urlimagem"]]];
AFImageRequestOperation *operation = [AFImageRequestOperation imageRequestOperationWithRequest:request imageProcessingBlock:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image){
Imagens *imagem = (Imagens *)[NSEntityDescription insertNewObjectForEntityForName:#"IMAGENS" inManagedObjectContext:managedObjectContext];
// Save Image
NSData *imageData = UIImageJPEGRepresentation(image, 90);
[imagem setCategoria:cat];
[imagem setTitulo:[arrImagem valueForKey:#"titulo"]];
[imagem setDescricao:[arrImagem valueForKey:#"descricao"]];
[imagem setImagem:imageData];
NSError *error;
if(![managedObjectContext save:&error]){
NSLog(#"houve um erro muito grave");
//return false;
}else{
NSLog(#"Salvou imagem");
}
success(imagem, [request.URL absoluteString], otherParams);
}failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error){
NSLog(#"%#", [error localizedDescription]);
failure(error);
}];
[operation start];
}
}
And when you call the method from your code you can do something like(using blocks):
[catalog downloadImageWithSuccess:^(UIImage *image, NSString *url, OtherParms here) {
//NOTIFY USER THAT THE IMAGE WITH URL HAS BEEN DOWNLOADED
}
failure:^(NSError *error) {
//NTOFIY USER THAT THE IMAGE FAILED
}
];
managed to solve my problem, sorry for the delay in posting the solution, follow the code below:
dispatch_group_t group = dispatch_group_create();
dispatch_group_enter(group);
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:strUrl]];
AFImageRequestOperation *operation = [AFImageRequestOperation imageRequestOperationWithRequest:request imageProcessingBlock:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image){
//your implementation
dispatch_group_leave(group); //<== NOTICE THIS
}failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error){
//your implementation
NSLog(#"%#", [error localizedDescription]);
}];
[operation start];
dispatch_group_wait(group, DISPATCH_TIME_FOREVER);
Thus the downloads ocorerão in order, if this code is inside a case, the next download will only be called when the method success^: or failure^: is called
I am trying to add a Success and Error block to check when the image is loaded so that I can use NSCache to dynamically resize the image. But when I try
[scribbleImage setImageWithURL: [NSURL URLWithString:scribble[#"scribble_image"]] placeholderImage:[UIImage imageNamed:#"Default.png"] success:^(UIImage *image) {
NSLog(#"done");
} failure:^(NSError *error) {
NSLog(#"error %#",error);
}];
Xcode gives me an error, saying No visible #interface for 'UIImageView' declares the selector 'setImageWithURL:placeholderImage:success:failure:'
I am not sure why.
PS. I am importing UIImageView+AFNetworking.h and things work just fine without a success and failure block
This is because the there is no method setImageWithURL:placeholderImage:success:failure: there is just setImageWithURLRequest:placeholderImage:success:failure:
NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:scribble[#"scribble_image"]]];
[scribbleImage setImageWithURLRequest:request placeholderImage:[UIImage imageNamed:#"Default.png"] success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
NSLog(#"Done");
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
NSLog(#"Failed with error: %#", error);
}];
If you look at what setImageWithURL:placeholderImage: does :
- (void)setImageWithURL:(NSURL *)url
placeholderImage:(UIImage *)placeholderImage
{
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request setHTTPShouldHandleCookies:NO];
[request addValue:#"image/*" forHTTPHeaderField:#"Accept"];
[self setImageWithURLRequest:request placeholderImage:placeholderImage success:nil failure:nil];
}
You see that this is the method is used to fetch the internally as well.