iOS - 判断是否纯数字

判断是否纯数字

+ (BOOL)isNumText:(NSString *)string
{
    string = [string stringByTrimmingCharactersInSet:[NSCharacterSet decimalDigitCharacterSet]];
    if(string.length > 0)
    {
        return NO;
    }
    return YES;
}

- (BOOL)isDigit {
    NSCharacterSet *alphaNums = [NSCharacterSet decimalDigitCharacterSet];
    NSCharacterSet *inStringSet = [NSCharacterSet characterSetWithCharactersInString:str];
    return [alphaNums isSupersetOfSet:inStringSet];
}