介紹

NSNumberFormatter 應該可以滿足你對數據形式的一般需求,值得了解一下.

NSNumber *num1 = [NSNumber numberWithDouble:1234567.8369];// ==================== 類方法 ====================// 四舍五入的整數 NSString *numberNoStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterNoStyle]; // 小數形式 NSString *numberDecimalStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterDecimalStyle]; // 貨幣形式 -- 本地化 NSString *numberCurrencyStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyStyle]; // 百分數形式 NSString *numberPercentStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterPercentStyle]; // 科學計數 NSString *numberScientificStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterScientificStyle]; // 朗讀形式 -- 本地化 NSString *numberSpellOutStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterSpellOutStyle]; // 序數形式 -- 本地化 NSString *numberOrdinalStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterOrdinalStyle]; // 貨幣形式 ISO -- 本地化 NSString *numberCurrencyISOStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyISOCodeStyle]; // 貨幣形式 -- 本地化 NSString *numberCurrencyPluralStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyPluralStyle]; // 會計計數 -- 本地化 NSString *numberCurrencyAccountingStyleStr = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyAccountingStyle]; NSLog(@"No Style = %@",numberNoStyleStr); // No Style = 1234568 NSLog(@"Decimal Style = %@",numberDecimalStyleStr); // Decimal Style = 1,234,567.837 NSLog(@"Currency Style = %@",numberCurrencyStyleStr); // Currency Style = $1,234,567.84 NSLog(@"Percent Style = %@",numberPercentStyleStr); // Percent Style = 123,456,784% NSLog(@"Scientific Style = %@",numberScientificStyleStr); // Scientific Style = 1.2345678369E6 // Spell Out Style = one million two hundred thirty-four thousand five hundred sixty-seven point eight three six nine NSLog(@"Spell Out Style = %@",numberSpellOutStyleStr); NSLog(@"Ordinal Style = %@",numberOrdinalStyleStr); // Ordinal Style = 1,234,568th NSLog(@"Currency ISO Style = %@",numberCurrencyISOStyleStr); // Currency ISO Style = USD1,234,567.84 NSLog(@"Currency plural Style = %@",numberCurrencyPluralStyleStr); // Currency plural Style = 1,234,567.84 US dollars NSLog(@"Currency accounting Style = %@",numberCurrencyAccountingStyleStr); // Currency accounting Style = $1,234,567.84 // ==================== 定制 ==================== NSNumberFormatter *numberFormatter = [NSNumberFormatter new]; numberFormatter.numberStyle = NSNumberFormatterDecimalStyle; // 格式寬度 numberFormatter.formatWidth = 15; // 填充符 numberFormatter.paddingCharacter = @"?"; // 填充位置 numberFormatter.paddingPosition = kCFNumberFormatterPadBeforeSuffix; numberFormatter.positiveSuffix = @"元"; NSLog(@"%@",[numberFormatter numberFromString:@"10000000元"]); // 10000000 // 縮放因子,你可以將一個數縮放指定比例,然后給其添加后綴,如傳入一個3000,你希望表示為3千,就要用到這個屬性 // 防止影響后面的測試,故注掉 // numberFormatter.multiplier = @1000; // NSLog(@"%@千",[numberFormatter numberFromString:@"1000"]); // 1千 // numberFormatter.multiplier = @0.001; // numberFormatter.positiveSuffix = @"千"; // NSLog(@"%@",[numberFormatter stringFromNumber:@10000]); // 10千 // 機制不明確,負號,正號 // numberFormatter.negativeFormat = @"^"; // numberFormatter.positiveFormat = @"~0"; // 貌似沒什么用 numberFormatter.allowsFloats = NO; numberFormatter.alwaysShowsDecimalSeparator = NO; numberFormatter.maximum = @1000; numberFormatter.minimum = @100; // 小數點樣式 numberFormatter.decimalSeparator = @"."; // 零的樣式 numberFormatter.zeroSymbol = @"-"; // 前綴和后綴 numberFormatter.positivePrefix = @"!"; numberFormatter.positiveSuffix = @"元"; numberFormatter.negativePrefix = @"@"; numberFormatter.negativeSuffix = @"虧"; // 指定符號,與我們在前面類方法中說明的一致 NSLog(@"貨幣代碼%@",numberFormatter.currencyCode); // 貨幣代碼USD NSLog(@"貨幣符號%@",numberFormatter.currencySymbol); // 貨幣符號$ NSLog(@"國際貨幣符號%@",numberFormatter.internationalCurrencySymbol); // 國際貨幣符號USD NSLog(@"百分比符號%@",numberFormatter.percentSymbol); // 百分比符號% NSLog(@"千分號符號%@",numberFormatter.perMillSymbol); // 千分號符號‰ NSLog(@"減號符號%@",numberFormatter.minusSign); // 減號符號- NSLog(@"加號符號%@",numberFormatter.plusSign); // 加號符號+ NSLog(@"指數符號%@",numberFormatter.exponentSymbol); // 指數符號E // 整數最多位數 numberFormatter.maximumIntegerDigits = 10; // 整數最少位數 numberFormatter.minimumIntegerDigits = 2; // 小數位最多位數 numberFormatter.maximumFractionDigits = 3; // 小數位最少位數 numberFormatter.minimumFractionDigits = 1; // 數字分割的尺寸 numberFormatter.groupingSize = 4; // 除了groupingSize決定的尺寸外,其他數字位分割的尺寸 numberFormatter.secondaryGroupingSize = 2; // 最大有效數字個數 numberFormatter.maximumSignificantDigits = 12; // 最少有效數字個數 numberFormatter.minimumSignificantDigits = 3; NSLog(@"正數%@,負數%@",[numberFormatter stringFromNumber:@(+12135230.2346)],[numberFormatter stringFromNumber:@(-12135231.2346)]); // 正數!12,13,5230.2346元,負數@12,13,5231.2346虧 NSLog(@"零 = %@",[numberFormatter stringFromNumber:@(0)]); // 零 = - // 舍入值,比如以10為進位值,那么156就進位為160,154進位為150 numberFormatter.roundingIncrement = @10; // 舍入方式 numberFormatter.roundingMode = kCFNumberFormatterRoundHalfUp; NSLog(@"%@",[numberFormatter stringFromNumber:@123456.7890]); // !12,3460元

文／劉大帥（簡書作者）
原文鏈接：http://www.jianshu.com/p/817029422a72
著作權歸作者所有，轉載請聯系作者獲得授權，并標注“簡書作者”。

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