Objective-C CSV Exchange Rate Generator

gistfile1.m

-(void)createExchangeRateCSVFile {
        //Put your output path here:
        NSString *outputPath = @"/Users/Milo/Desktop/ExchangeRates.csv";
        
        
        NSArray *currencyCodes = [NSLocale ISOCurrencyCodes];
        
        NSMutableArray *array = [NSMutableArray array];
        
        
        for (NSString *currencyCode in currencyCodes) {
            @autoreleasepool {
                
                //For monitoring progress, as first letter goes towards z, you'll know its
                //getting closer to being finished
                printf("%s\n", [currencyCode UTF8String]);
                
                //For first 250 Currencies:
                
                NSMutableString *urlInputString = [@"" mutableCopy];
                //Get url input
                for (int i = 0; i < 250; i++) {
                    
                    if (i != 249) {
                        [urlInputString appendFormat:@"\"%@%@\",", currencyCode, currencyCodes[i]];
                    } else {
                        [urlInputString appendFormat:@"\"%@%@\"", currencyCode, currencyCodes[i]];
                    }
                }
                
                
                NSString *yahooURL = [NSString stringWithFormat:@"https://query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.xchange where pair in (%@)&format=json&diagnostics=false&env=store://datatables.org/alltableswithkeys&callback=", urlInputString];
                
                yahooURL = [yahooURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
                
                //Query yahoo
                NSData *resultData = [NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:yahooURL]] returningResponse:nil error:nil];
                
                NSDictionary *JSONResponse = [NSJSONSerialization JSONObjectWithData:resultData options:0 error:nil];
                
                NSArray *rates = JSONResponse[@"query"][@"results"][@"rate"];
                
                //Add result to array
                for (NSDictionary *rate in rates) {
                    //Make sure there is an exchange rate
                    if (![rate[@"Rate"] isEqualToString:@"0.00"]) {
                        [array addObject:rate[@"id"]];
                        [array addObject:rate[@"Rate"]];
                    }
                }
                
                //For remaining
                
                
                NSMutableString *urlInputString1 = [@"" mutableCopy];
                
                for (int i = 250; i < currencyCodes.count; i++) {
                    
                    if (i != currencyCodes.count - 1) {
                        [urlInputString1 appendFormat:@"\"%@%@\",", currencyCode, currencyCodes[i]];
                    } else {
                        [urlInputString1 appendFormat:@"\"%@%@\"", currencyCode, currencyCodes[i]];
                    }
                }
                
                
                NSString *yahooURL1 = [NSString stringWithFormat:@"https://query.yahooapis.com/v1/public/yql?q=select * from yahoo.finance.xchange where pair in (%@)&format=json&diagnostics=false&env=store://datatables.org/alltableswithkeys&callback=", urlInputString1];
                
                yahooURL1 = [yahooURL1 stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
                
                
                NSData *resultData1 = [NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:yahooURL1]] returningResponse:nil error:nil];
                
                NSDictionary *JSONResponse1 = [NSJSONSerialization JSONObjectWithData:resultData1 options:0 error:nil];
                
                NSArray *rates1 = JSONResponse1[@"query"][@"results"][@"rate"];
                
                for (NSDictionary *rate in rates1) {
                    //Again, make sure the rate exists
                    if (![rate[@"Rate"] isEqualToString:@"0.00"]) {
                        [array addObject:rate[@"id"]];
                        [array addObject:rate[@"Rate"]];
                    }
                }
            }
        }
        
        NSString *outputString = [array componentsJoinedByString:@","];
        [outputString writeToFile:outputPath atomically:YES encoding:NSUTF8StringEncoding error:nil];
    }