OC : NSNumberFormatter （ 数字格式化）

NSNumberFormatter的新子类传送门：
http://blog.csdn.net/wiki_su/article/details/77573271

NSNumberFormatter 数字格式化

    NSNumber *num1 = [NSNumber numberWithDouble:1234567.8369];// ==================== 类方法 ====================    // 四舍五入的整数    // 1234568    NSString *numberNoStyleStr                 = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterNoStyle];    // 小数形式    // 1,234,567.837    NSString *numberDecimalStyleStr            = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterDecimalStyle];    // 货币形式 -- 本地化    // $1,234,567.84    NSString *numberCurrencyStyleStr           = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyStyle];    // 百分数形式    // 123,456,784%    NSString *numberPercentStyleStr            = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterPercentStyle];    // 科学计数    // 1.2345678369E6    NSString *numberScientificStyleStr         = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterScientificStyle];    // 朗读形式 -- 本地化    // one million two hundred thirty-four thousand five hundred sixty-seven point eight three six nine    NSString *numberSpellOutStyleStr           = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterSpellOutStyle];    // 序数形式 -- 本地化    // 1,234,568th    NSString *numberOrdinalStyleStr            = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterOrdinalStyle];    // 货币形式 ISO -- 本地化    // USD1,234,567.84    NSString *numberCurrencyISOStyleStr        = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyISOCodeStyle];    // 货币形式 -- 本地化    // 1,234,567.84 US dollars    NSString *numberCurrencyPluralStyleStr     = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyPluralStyle];    // 会计计数 -- 本地化    // $1,234,567.84    NSString *numberCurrencyAccountingStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyAccountingStyle];

    NSNumberFormatter *numberFormatter = [NSNumberFormatter new];    numberFormatter.numberStyle = NSNumberFormatterDecimalStyle;    // 格式宽度    numberFormatter.formatWidth = 15;    // 填充符    numberFormatter.paddingCharacter = @"?";    // 填充位置    numberFormatter.paddingPosition = kCFNumberFormatterPadBeforeSuffix;    numberFormatter.positiveSuffix = @"元";   [numberFormatter numberFromString:@"10000000元"]);      numberFormatter.allowsFloats = NO;    numberFormatter.alwaysShowsDecimalSeparator = NO;    numberFormatter.maximum = @1000;    numberFormatter.minimum = @100;    // 小数点样式    numberFormatter.decimalSeparator = @".";    // 零的样式    numberFormatter.zeroSymbol       = @"-";    // 前缀和后缀    numberFormatter.positivePrefix = @"!";    numberFormatter.positiveSuffix = @"元";    numberFormatter.negativePrefix = @"@";    numberFormatter.negativeSuffix = @"亏";    // 指定符号,与我们在前面类方法中说明的一致    // 货币代码USD    NSLog(@"货币代码%@",numberFormatter.currencyCode);    // 货币符号$    NSLog(@"货币符号%@",numberFormatter.currencySymbol);     // 国际货币符号USD    NSLog(@"国际货币符号%@",numberFormatter.internationalCurrencySymbol);     // 百分比符号%    NSLog(@"百分比符号%@",numberFormatter.percentSymbol);     // 千分号符号‰    NSLog(@"千分号符号%@",numberFormatter.perMillSymbol);      // 减号符号-    NSLog(@"减号符号%@",numberFormatter.minusSign);       // 加号符号+    NSLog(@"加号符号%@",numberFormatter.plusSign);       // 指数符号E    NSLog(@"指数符号%@",numberFormatter.exponentSymbol);      // 整数最多位数    numberFormatter.maximumIntegerDigits = 10;    // 整数最少位数    numberFormatter.minimumIntegerDigits = 2;    // 小数位最多位数    numberFormatter.maximumFractionDigits = 3;    // 小数位最少位数    numberFormatter.minimumFractionDigits = 1;    // 数字分割的尺寸    numberFormatter.groupingSize = 4;    // 除了groupingSize决定的尺寸外,其他数字位分割的尺寸    numberFormatter.secondaryGroupingSize = 2;    // 最大有效数字个数    numberFormatter.maximumSignificantDigits = 12;    // 最少有效数字个数    numberFormatter.minimumSignificantDigits = 3;    // 正数!12,13,5230.2346元,负数@12,13,5231.2346亏    NSLog(@"正数%@,负数%@",[numberFormatter stringFromNumber:@(+12135230.2346)],[numberFormatter stringFromNumber:@(-12135231.2346)]);     //  零 = -    NSLog(@"零 = %@",[numberFormatter stringFromNumber:@(0)]);     // 舍入值,比如以10为进位值,那么156就进位为160,154进位为150    numberFormatter.roundingIncrement = @10;    // 舍入方式    numberFormatter.roundingMode = kCFNumberFormatterRoundHalfUp;    // !12,3460元    NSLog(@"%@",[numberFormatter stringFromNumber:@123456.7890]); 

原文章：http://www.jianshu.com/p/817029422a72