IOS学习 关于NSNumberFormatter，NSNumber转NSString的小细节

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

NSNumber *number = [NSNumber numberWithDouble:1234.99];

[formatter setNumberStyle:NSNumberFormatterDecimalStyle];

NSLog(@"Decimal Style: %@", [formatter stringFromNumber:number]);

number = [NSNumber numberWithDouble:.2];

[formatter setNumberStyle:NSNumberFormatterPercentStyle];

NSLog(@"Percent Style: %@", [formatter stringFromNumber:number]);

number = [NSNumber numberWithDouble:200.95];

[formatter setNumberStyle:NSNumberFormatterCurrencyStyle];

NSLog(@"Currency Style: %@", [formatter stringFromNumber:number]);

[formatter setNumberStyle:NSNumberFormatterScientificStyle];

NSLog(@"Scientific Style: %@", [formatter stringFromNumber:number]);

[formatter setNumberStyle:NSNumberFormatterSpellOutStyle];

NSLog(@"Spelled Out Style: %@", [formatter stringFromNumber:number]);

NSLocale *locale = [[[NSLocale alloc] initWithLocaleIdentifier:@"zh_Hans"] autorelease];

[formatter setLocale:locale];

NSLog(@"Spelled Out Style(locale): %@", [formatter stringFromNumber:number]);

Console:

Decimal Style: 1,234.99

Percent Style: 20%

Currency Style: $200.95

Scientific Style: 2.0095E2

Spelled Out Style: two hundred point nine five

Spelled Out Style(locale): 二百点九五

备注：默认是0为整数类型