【iOS】NSNumberFormatter

介绍
NSNumberFormatter 应该可以满足你对数据形式的一般需求,值得了解一下.

NSNumber *num1 = [NSNumber numberWithDouble:1234567.8369];

// ==================== 类方法 ====================

// 四舍五入的整数
NSString *numberNoStyleStr                 = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterNoStyle];

// 小数形式
NSString *numberDecimalStyleStr            = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterDecimalStyle];

// 货币形式 -- 本地化
NSString *numberCurrencyStyleStr           = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyStyle];

// 百分数形式
NSString *numberPercentStyleStr            = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterPercentStyle];

// 科学计数
NSString *numberScientificStyleStr         = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterScientificStyle];

// 朗读形式 -- 本地化
NSString *numberSpellOutStyleStr           = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterSpellOutStyle];

// 序数形式 -- 本地化
NSString *numberOrdinalStyleStr            = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterOrdinalStyle];

// 货币形式 ISO -- 本地化
NSString *numberCurrencyISOStyleStr        = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyISOCodeStyle];

// 货币形式 -- 本地化
NSString *numberCurrencyPluralStyleStr     = [NSNumberFormatter localizedStringFromNumber:num1 numberStyle:NSNumberFormatterCurrencyPluralStyle];

// 会计计数 -- 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;

// 格式宽度
numberFormatter.formatWidth = 15;

// 填充符
numberFormatter.paddingCharacter = @"?";

// 填充位置
numberFormatter.paddingPosition = kCFNumberFormatterPadBeforeSuffix;
numberFormatter.positiveSuffix = @"元";

NSLog(@"%@",[numberFormatter numberFromString:@"10000000元"]);  // 10000000

// 缩放因子,你可以将一个数缩放指定比例,然后给其添加后缀,如传入一个3000,你希望表示为3千,就要用到这个属性
// 防止影响后面的测试,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

// 机制不明确,负号,正号

// numberFormatter.negativeFormat = @”^”;
// numberFormatter.positiveFormat = @”~0”;

// 貌似没什么用
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
NSLog(@"货币代码%@",numberFormatter.currencyCode);                     // 货币代码USD
NSLog(@"货币符号%@",numberFormatter.currencySymbol);                   // 货币符号$
NSLog(@"国际货币符号%@",numberFormatter.internationalCurrencySymbol);   // 国际货币符号USD
NSLog(@"百分比符号%@",numberFormatter.percentSymbol);                   // 百分比符号%
NSLog(@"千分号符号%@",numberFormatter.perMillSymbol);                   // 千分号符号‰
NSLog(@"减号符号%@",numberFormatter.minusSign);                         // 减号符号-
NSLog(@"加号符号%@",numberFormatter.plusSign);                          // 加号符号+
NSLog(@"指数符号%@",numberFormatter.exponentSymbol);                    // 指数符号E

// 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;

NSLog(@"正数%@,负数%@",[numberFormatter stringFromNumber:@(+12135230.2346)],[numberFormatter stringFromNumber:@(-12135231.2346)]);  // 正数!12,13,5230.2346元,负数@12,13,5231.2346亏
NSLog(@"零 = %@",[numberFormatter stringFromNumber:@(0)]); //  零 = -

// 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;
NSLog(@"%@",[numberFormatter stringFromNumber:@123456.7890]);  // !12,3460元

【iOS】NSNumberFormatter

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