NSNumberFormatter的使用

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通过NSNumberFormatter，可以设置NSNumber输出的格式。

NSNumberFormatter *formatter = [[NSNumberFormatter alloc] init];

formatter.numberStyle = NSNumberFormatterNoStyle;

NSString *string = [formatter stringFromNumber:[NSNumber numberWithInt:123456789]];

NSNumber *number = [formatter numberFromString:string];

其中NSNumberFormatter类有个属性numberStyle，它是一个枚举型，设置不同的值可以输出不同的数字格式。该枚举包括：

enum {

NSNumberFormatterNoStyle = kCFNumberFormatterNoStyle,

NSNumberFormatterDecimalStyle = kCFNumberFormatterDecimalStyle,

NSNumberFormatterCurrencyStyle = kCFNumberFormatterCurrencyStyle,

NSNumberFormatterPercentStyle = kCFNumberFormatterPercentStyle,

NSNumberFormatterScientificStyle = kCFNumberFormatterScientificStyle,

NSNumberFormatterSpellOutStyle = kCFNumberFormatterSpellOutStyle

NSNumberFormatterRoundCeiling = kCFNumberFormatterRoundCeiling,//四舍五入，原值2.7999999999,直接输出3

NSNumberFormatterRoundFloor = kCFNumberFormatterRoundFloor,//保留小数输出2.8 正是想要的

NSNumberFormatterRoundDown = kCFNumberFormatterRoundDown,//加上了人民币标志，原值输出￥2.8

NSNumberFormatterRoundUp = kCFNumberFormatterRoundUp,//本身数值乘以100后用百分号表示,输出280%

NSNumberFormatterRoundHalfEven = kCFNumberFormatterRoundHalfEven,//原值表示，输出2.799999999E0

NSNumberFormatterRoundHalfDown = kCFNumberFormatterRoundHalfDown,//原值的中文表示，输出二点七九九九。。。。

NSNumberFormatterRoundHalfUp = kCFNumberFormatterRoundHalfUp //原值中文表示，输出第三

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