Google Suggestions category on NSString with language support

NSString+GoogleSuggestions.h

// erkanyildiz
// 20160707-1213-UTC+09
//
// NSString+GoogleSuggestions.h

#import <Foundation/Foundation.h>

@interface NSString (GoogleSuggestions)
- (void)GoogleSuggestions:(void (^)(NSArray* suggestions, NSError* error))completion;
- (void)GoogleSuggestionsForLanguage:(NSString*)ISOLanguageCode completion:(void (^)(NSArray* suggestions, NSError* error))completion;
@end

NSString+GoogleSuggestions.m

// erkanyildiz
// 20160707-1213-UTC+09
//
// NSString+GoogleSuggestions.m

#import "NSString+GoogleSuggestions.h"

@implementation NSString (GoogleSuggestions)

- (void)GoogleSuggestions:(void (^)(NSArray* suggestions, NSError* error))completion
{
    [self GoogleSuggestionsForLanguage:nil completion:completion];
}


- (void)GoogleSuggestionsForLanguage:(NSString*)ISOLanguageCode completion:(void (^)(NSArray* suggestions, NSError* error))completion
{
    if(!completion) return;
    
    NSString* APIURL = @"http://suggestqueries.google.com/complete/search?&client=chrome&hl=%@&q=%@";
    
    if(!ISOLanguageCode || [ISOLanguageCode isEqualToString:@""])
        ISOLanguageCode = @"EN";
    
    NSString* URLString = [NSString stringWithFormat:APIURL, ISOLanguageCode.uppercaseString, self];
    URLString = [URLString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    
    [[NSURLSession.sharedSession dataTaskWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:URLString]]
    completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error)
    {
        if(error){ completion(nil, error); return; }

        NSString* ASCIIString = [NSString.alloc initWithData:data encoding:NSASCIIStringEncoding];
        NSData* UTF8Data = [ASCIIString dataUsingEncoding:NSUTF8StringEncoding];
        id JSON = [NSJSONSerialization JSONObjectWithData:UTF8Data options:0 error:&error];
 
        if(error){ completion(nil, error); return; }
    
        NSArray* suggestions = ([JSON count] >= 2) ? JSON[1] : nil;
    
        if (suggestions) { completion(suggestions, nil); return; }

        completion(nil, [NSError errorWithDomain:@"InvalidGoogleAPIResponse" code:0 userInfo:nil]);
    }] resume];
}
@end