Cropping an image before sending to the server on iOS - ios

Question

I'm trying to crop an image before sending to the server and I'm having issues.
I'm was trying to do this:
imageUploadReq.photo = [self encodeToBase64String:[UIImage imageWithData:UIImageJPEGRepresentation(fileData, 0.07f)]];
But Xcode is complaining that "Incompatible pointer types passing NSData * to parameter type UIImage". I tried to cast it, but it wouldn't work either.
Here is the code:
- (void)uploadPhoto {
NSData *fileData;
if (self.image != nil) {
UIImage *newImage = [self resizeImage:self.image toWidth:320.0f andHeight:480.0f];
fileData = UIImageJPEGRepresentation(newImage, 0.07f);
}
WUTModelImageUploadReq *imageUploadReq = [[WUTModelImageUploadReq alloc]init];
// I'm trying to set the first parameter of UIImageJPEGRepresentation to fileData
imageUploadReq.photo = [self encodeToBase64String:[UIImage imageWithData:UIImageJPEGRepresentation(self.viewControllerPost.imageForPost, 0.07f)]];
imageUploadReq.extension = #"jpg";
void (^wsSuccessHandler)(AFHTTPRequestOperation *operation, NSDictionary* responseObject) = ^(AFHTTPRequestOperation *operation, id responseObject){
NSLog(#"Pull Feed responseObject %#",responseObject);
NSError *error;
WUTModelPostImageResponse *wsResponse = [[WUTModelPostImageResponse alloc]initWithDictionary:(NSDictionary *)responseObject error:&error];
if (error) {
errorMessage = #"Failure to upload image.";
[self postExecuteFail];
}else{
if (wsResponse.success) {
WUTModelImage *imageTemp = [wsResponse.data firstObject];
[postItem setObject:imageTemp.photo forKey:#"photo"];
[self uploadPostFeed];
}else{
errorMessage = #"Failure to upload image.";
[self postExecuteFail];
}
}
};
void (^wsErrorHandler)(AFHTTPRequestOperation *operation, NSError *error) = ^(AFHTTPRequestOperation *operation, NSError *error){
if ([error.localizedDescription rangeOfString:#"401"].location != NSNotFound)
errorMessage = #"It seems that your login session get expire, Please relogin after logged out.";
else
errorMessage = #"Failure to upload image.";
[self postExecuteFail];
};
AFHTTPRequestOperation *op = [WUTCommonWebServices WebServicePostCallWithAccessTokenForEndPoint:WS_UploadImage WithJson:imageUploadReq ForSuccess:wsSuccessHandler ForFailure:wsErrorHandler];
[op start];
}

Answer 1

I think, you need this:
+(UIImage*)imageWithImage:(UIImage*)image scaledToSize:(CGSize)newSize{
UIGraphicsBeginImageContext( newSize );
[image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];
UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage; }
You just need to pass original image and your desired size and it will return your expected image.
Call the method like:
UIImage *originalImage = [info valueForKey:UIImagePickerControllerOriginalImage]; // here originalImage is image taken from camera or you can use whatever you want
UIImage * image = [GlobalFunction imageWithImage:originalImage scaledToSize:CGSizeMake(200, 200)]; // GlobalFunction is class where I have defined this method and it returns UIImage of size (200, 200)