【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元文／刘大帅（简书作者）
原文链接：http://www.jianshu.com/p/817029422a72
著作权归作者所有，转载请联系作者获得授权，并标注“简书作者”。
原文链接：http://www.jianshu.com/p/817029422a72
著作权归作者所有，转载请联系作者获得授权，并标注“简书作者”。
