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.
Related
I am having an issue where my images in my tableview cell flicker everytime the table reloadData method is called. The flickering is occuring because the image is being downloaded EVERY time the table is reloaded. How do I make it so this image isnt being downloaded everytime, but only once?
This is the cellForRowAtIndexPath code in SelectStationViewController.m. This class handles the tableView.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
{
StationRest * StationRest = [[CurrentUser sharedInstance].userStations objectAtIndex:indexPath.row];
StationListCell *cell= [[StationListCell alloc]initWithFrame:CGRectMake(0, 0, 375,88)];
cell.cellDelegate = self;
//This method below downloads the image into the cell.
[cell configureCellWithStationRest:StationRest forCellType:StationListCellTypeSelect];
return cell;
}
This is the code in StationListCell.m, the class that is hooked up with the cell. Here is where the image is downloaded using AFNetworking. I can use GCD with [[NSData alloc] initWithContentsOfURL method instead of AFNetworking, but I still achieve the same result.
-(void)configureCellWithStationRest:(StationRest *)stationRest forCellType:(StationListCellType) cellType{
NSURL *url = [NSURL URLWithString:stationRest.thumbURL];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFHTTPRequestOperation *requestOperation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
requestOperation.responseSerializer = [AFImageResponseSerializer serializer];
[requestOperation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
[self.thumbButton setImage:responseObject forState:UIControlStateNormal];
[self.thumbButton setContentMode:UIViewContentModeScaleAspectFill];
}
failure:^(AFHTTPRequestOperation *operation, NSError *error) {
DLog(#"Image error: %#", error);
}];
[requestOperation start];
}
You can use UIImageView+AFNetworking.h category.It provides method to download the image from url and cache it.Please check its documentation for more information.
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString: url]];
[request addValue:#"image/*" forHTTPHeaderField:#"Accept"];
[yourImageView setImageWithURLRequest:request placeholderImage:nil success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
yourImageView.image = image;
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {
NSLog(#"Failed to load image");
}];
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
}];
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
When the operation is running, I can not enter data in JSON model CREATED BY ACCELERATOR.
Can you tell me what I am doing wrong?
{
[super viewDidLoad];
NSLog(#"you are in a tableViewController");
self.title = #"NavigationOrdini";
NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://www.stampa6x3.com/json.php?azione=ordini"]];
AFJSONRequestOperation* operation;
operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:req
success:^(NSURLRequest *request, NSURLResponse *response, id JSON)
{
[[ordiniModel alloc] initWithDictionary:JSON];
}
failure:^(NSURLRequest *request, NSURLResponse *response, NSError
*error, id JSON) {
[self setTitle:#"Dictionary"];
NSLog(#"failed! %d",[error code]);
}];
[operation start];
ordiniModel*test;
NSLog(#"il valore è %#",test.ordini.description);
}
AFJSONRequestOperation is asynchronous, meaning it that the code continues to execute while the rest of the app runs. The completion block are run when the code actually completes.
So try:
NSLog(#"you are in a tableViewController");
self.title = #"NavigationOrdini";
ordiniModel *test; // <-- create variable here
NSURLRequest *req = [NSURLRequest requestWithURL:[NSURL URLWithString:#"http://www.stampa6x3.com/json.php?azione=ordini"]];
AFJSONRequestOperation* operation;
operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:req
success:^(NSURLRequest *request, NSURLResponse *response, id JSON)
{
test = [[ordiniModel alloc] initWithDictionary:JSON]; // <-- Assign here
NSLog(#"il valore è %#",test.ordini.description);
}
failure:^(NSURLRequest *request, NSURLResponse *response, NSError
*error, id JSON) {
[self setTitle:#"Dictionary"];
NSLog(#"failed! %d",[error code]);
}];
[operation start];
Dumb question. I'm just pasting the example AFNetworking code in:
NSURL *url = [NSURL URLWithString:#"https://gowalla.com/users/mattt.json"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
NSLog(#"Name: %# %#", [JSON valueForKeyPath:#"first_name"], [JSON valueForKeyPath:#"last_name"]);
} failure:nil];
[operation start];
But, nothing happens. If I output operation to NSLog it looks like the request was cancelled:
<AFJSONRequestOperation: 0x81655f0, state: isExecuting, cancelled: NO request: <NSURLRequest https://gowalla.com/users/mattt.json>, response: (null)>
What am I doing wrong?
Your best bet would be to add a failure block and then inspect the variables provided in that
NSURL *url = [NSURL URLWithString:#"https://gowalla.com/users/mattt.json"];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
AFJSONRequestOperation *operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {
NSLog(#"Name: %# %#", [JSON valueForKeyPath:#"first_name"], [JSON valueForKeyPath:#"last_name"]);
} failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {
NSLog(#"%#", [error localizedDescription]);
}];
[operation start];