Modify decimal places based on currency code

[jasperblues]

Some currencies have zero decimal places (eg Japanese yen), some three decimal places (eg Kuwaiti dinar) and some round to (don't spray your coffee here. . . . .) 0.7 places ( ie groups of 5)

The list of codes and required rounding is here: http://en.wikipedia.org/wiki/ISO_4217

[markrickert]

Oh Jesus. FML. Lol

[jasperblues]

I think its the Airey from Madagascar (land of the Dodo bird) . . . is one of the few currencies that round to 0.7. . . strangely, its quite common . . (by that I mean they're not the only ones). . . (I guess groups of 5, because we have 5 fingers ;) )

[markrickert]

I bet there's an NSLocale property that might help with that. I'll investigate.

[jasperblues]

Could be. . .. if not the ISO format will be quite stable over time, so you could parse the data. . . Here it is in text format: . . . (3rd column is the number of "cents" )

| AED || 784 || 2 || United Arab Emirates dirham

| AFN || 971 || 2 || Afghan afghani ||

| ALL || 008 || 2 || Albanian lek ||

| AMD || 051 || 2 || Armenian dram ||

| ANG || 532 || 2 || Netherlands Antillean guilder

| AOA || 973 || 2 || Angolan kwanza

| ARS || 032 || 2 || Argentine peso

| AUD || 036 || 2 || Australian dollar

| AWG || 533 || 2 || Aruban florin ||

| AZN || 944 || 2 || Azerbaijani manat

| BAM || 977 || 2 || Bosnia and Herzegovina convertible mark

| BBD || 052 || 2 || Barbados dollar

| BDT || 050 || 2 || Bangladeshi taka

| BGN || 975 || 2 || Bulgarian lev

| BHD || 048 || 3 || Bahraini dinar

| BIF || 108 || 0 || Burundian franc

| BMD || 060 || 2 || Bermudian dollar

| BND || 096 || 2 || Brunei dollar

| BOB || 068 || 2 || Boliviano

| BOV || 984 || 2 || Bolivian Mvdol

| BRL || 986 || 2 || Brazilian real

| BSD || 044 || 2 || Bahamian dollar

| BTN || 064 || 2 || Bhutanese ngultrum

| BWP || 072 || 2 || Botswana pula

| BYR || 974 || 0 || Belarusian ruble

| BZD || 084 || 2 || Belize dollar

| CAD || 124 || 2 || Canadian dollar

| CDF || 976 || 2 || Congolese franc

| CHF || 756 || 2 || Swiss franc

| CLF || 990 || 0 || Unidad de Fomento

| CLP || 152 || 0 || Chilean peso

| CNY || 156 || 2 || Renminbi|Chinese yuan

| COP || 170 || 2 || Colombian peso

| COU || 970 || 2 || Unidad de Valor Real

| CRC || 188 || 2 || Costa Rican colon

| CUC || 931 || 2 || Cuban convertible peso

| CUP || 192 || 2 || Cuban peso

| CVE || 132 || 0 || Cape Verde escudo

| CZK || 203 || 2 || Czech koruna

| DJF || 262 || 0 || Djiboutian franc

| DKK || 208 || 2 || Danish krone

| DOP || 214 || 2 || Dominican peso

| DZD || 012 || 2 || Algerian dinar

| EGP || 818 || 2 || Egyptian pound

| ERN || 232 || 2 || Eritrean nakfa

| ETB || 230 || 2 || Ethiopian birr

| EUR || 978 || 2 || Euro

| FJD || 242 || 2 || Fiji dollar

| FKP || 238 || 2 || Falkland Islands pound

| GBP || 826 || 2 || Pound sterling

| GEL || 981 || 2 || Georgian lari

| GHS || 936 || 2 || Ghanaian cedi

| GIP || 292 || 2 || Gibraltar pound

| GMD || 270 || 2 || Gambian dalasi

| GNF || 324 || 0 || Guinean franc

| GTQ || 320 || 2 || Guatemalan quetzal

| GYD || 328 || 2 || Guyanese dollar

| HKD || 344 || 2 || Hong Kong dollar

| HNL || 340 || 2 || Honduran lempira

| HRK || 191 || 2 || Croatian kuna

| HTG || 332 || 2 || Haitian gourde

| HUF || 348 || 2 || Hungarian forint

| IDR || 360 || 2 || Indonesian rupiah

| ILS || 376 || 2 || Israeli new shekel

| INR || 356 || 2 || Indian rupee

| IQD || 368 || 3 || Iraqi dinar

| IRR || 364 || 0 || Iranian rial

| ISK || 352 || 0 || Icelandic króna

| JMD || 388 || 2 || Jamaican dollar

| JOD || 400 || 3 || Jordanian dinar

| JPY || 392 || 0 || Japanese yen

| KES || 404 || 2 || Kenyan shilling

| KGS || 417 || 2 || Kyrgyzstani som

| KHR || 116 || 2 || Cambodian riel

| KMF || 174 || 0 || Comoro franc

| KPW || 408 || 0 || North Korean won

| KRW || 410 || 0 || South Korean won

| KWD || 414 || 3 || Kuwaiti dinar

| KYD || 136 || 2 || Cayman Islands dollar

| KZT || 398 || 2 || Kazakhstani tenge

| LAK || 418 || 0 || Lao kip

| LBP || 422 || 0 || Lebanese pound

| LKR || 144 || 2 || Sri Lankan rupee

| LRD || 430 || 2 || Liberian dollar

| LSL || 426 || 2 || Lesotho loti

| LTL || 440 || 2 || Lithuanian litas

| LVL || 428 || 2 || Latvian lats

| LYD || 434 || 3 || Libyan dinar

| MAD || 504 || 2 || Moroccan dirham

| MDL || 498 || 2 || Moldovan leu

| MGA || 969 || 0.7 || Malagasy ariary

| MKD || 807 || 0 || Macedonian denar

| MMK || 104 || 0 || Myanma kyat

| MNT || 496 || 2 || Mongolian tögrög|Mongolian tugrik

| MOP || 446 || 2 || Macanese pataca

| MUR || 480 || 2 || Mauritian rupee

| MVR || 462 || 2 || Maldivian rufiyaa

| MWK || 454 || 2 || Malawian kwacha

| MXN || 484 || 2 || Mexican peso

| MXV || 979 || 2 || Mexican Unidad de Inversion

| MYR || 458 || 2 || Malaysian ringgit

| MZN || 943 || 2 || Mozambican metical

| NAD || 516 || 2 || Namibian dollar

| NGN || 566 || 2 || Nigerian naira

| NIO || 558 || 2 || Nicaraguan córdoba

| NOK || 578 || 2 || Norwegian krone

| NPR || 524 || 2 || Nepalese rupee

| NZD || 554 || 2 || New Zealand dollar

| OMR || 512 || 3 || Omani rial

| PAB || 590 || 2 || Panamanian balboa

| PEN || 604 || 2 || Peruvian nuevo sol

| PGK || 598 || 2 || Papua New Guinean kina

| PHP || 608 || 2 || Philippine peso

| PKR || 586 || 2 || Pakistani rupee

| PLN || 985 || 2 || Polish złoty

| PYG || 600 || 0 || Paraguayan guaraní

| QAR || 634 || 2 || Qatari riyal

| RON || 946 || 2 || Romanian Leu|Romanian new leu

| RSD || 941 || 2 || Serbian dinar

| RUB || 643 || 2 || Russian rouble

| RWF || 646 || 0 || Rwandan franc

| SAR || 682 || 2 || Saudi riyal

| SBD || 090 || 2 || Solomon Islands dollar

| SCR || 690 || 2 || Seychelles rupee

| SDG || 938 || 2 || Sudanese pound

| SEK || 752 || 2 || Swedish krona/kronor

| SGD || 702 || 2 || Singapore dollar

| SHP || 654 || 2 || Saint Helena pound

| SLL || 694 || 0 || Sierra Leonean leone

| SOS || 706 || 2 || Somali shilling

| SRD || 968 || 2 || Surinamese dollar

| SSP || 728 || 2 || South Sudanese pound

| STD || 678 || 0 || São Tomé and Príncipe dobra

| SYP || 760 || 2 || Syrian pound

| SZL || 748 || 2 || Swazi lilangeni

| THB || 764 || 2 || Thai baht

| TJS || 972 || 2 || Tajikistani somoni

| TMT || 934 || 2 || Turkmenistani manat

| TND || 788 || 3 || Tunisian dinar

| TOP || 776 || 2 || Tongan paʻanga

| TRY || 949 || 2 || Turkish lira

| TTD || 780 || 2 || Trinidad and Tobago dollar

| TWD || 901 || 2 || New Taiwan dollar

| TZS || 834 || 2 || Tanzanian shilling

| UAH || 980 || 2 || Ukrainian hryvnia

| UGX || 800 || 2 || Ugandan shilling

| USD || 840 || 2 || United States dollar

| UYU || 858 || 2 || Uruguayan peso

| UZS || 860 || 2 || Uzbekistan som

| VEF || 937 || 2 || Venezuelan bolívar|Venezuelan bolívar fuerte

| VND || 704 || 0 || Vietnamese dong

| VUV || 548 || 0 || Vanuatu vatu

| WST || 882 || 2 || Samoan tala

| XAF || 950 || 0 || Central African CFA franc

| XAG || 961 || . || Silver (one troy ounce)

| XAU || 959 || . || Gold (one troy ounce)

| XBA || 955 || . || European Composite Unit (EURCO)

| XCD || 951 || 2 || East Caribbean dollar

| XOF || 952 || 0 || West African CFA franc|CFA franc BCEAO

| XPD || 964 || . || Palladium (one troy ounce)

| XPF || 953 || 0 || CFP franc

| XPT || 962 || . || Platinum (one troy ounce)

| XTS || 963 || . || Code reserved for testing purposes

| YER || 886 || 2 || Yemeni rial

| ZAR || 710 || 2 || South African rand

| ZMW || 967 || 2 || Zambian kwacha

[Hout]

It is all built into iOS:

NSDecimalNumber *amount = [NSDecimalNumber decimalNumberWithDecimal:[@(1234.56789) decimalValue]];  
NSNumberFormatter *amountFormatter = [NSNumberFormatter new];
amountFormatter.numberStyle = NSNumberFormatterCurrencyStyle;
amountFormatter.locale = self.locale;
NSString *text = [amountFormatter stringFromNumber:amount];