去掉服务器返回结果文本中的<null>

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//去掉服务器返回结果文本中的<null>+ (NSString *)replaceNull:(NSString *)source{    NSString *result = [NSString stringWithFormat:@"%@", source];    if (result != nil && (NSNull *)result != [NSNull null]) {        if ([result isEqualToString:@"<null>"]) {            return @"";        } else if ([result isEqualToString:@"(null)"]) {            return @"";        }else if ([result isEqualToString:@"null"]){            return @"";        }else {            return result;        }    } else {        return @"";    }}

//判断服务器返回List类型+ (BOOL)arrayIfNull:(id)source{    if ([source isKindOfClass:[NSArray class]]) {        return YES;    }else{        return NO;    }}

//判断字符串是否为纯数字+ (BOOL)isPureInt:(NSString*)string{    NSScanner* scan = [NSScanner scannerWithString:string];    int val;    return[scan scanInt:&val] && [scan isAtEnd];}

//时间转换 yyyy年MM月dd日 HH:mm:ss+ (NSString *)getTimeWithDate1:(NSNumber *)numberTime{    CGFloat secondTime = [numberTime floatValue]/1000;    NSDate *time = [NSDate dateWithTimeIntervalSince1970:secondTime];    NSDateFormatter *timerFormatter = [[NSDateFormatter alloc] init];    [timerFormatter setDateFormat:@"yyyy年MM月dd日 HH:mm:ss"];    NSString *timeString = [timerFormatter stringFromDate:time];    return timeString;}

//时间转换 yyyy年MM月dd日+ (NSString *)getTimeWithDate:(NSNumber *)numberTime{    CGFloat secondTime = [numberTime floatValue]/1000;    NSDate *time = [NSDate dateWithTimeIntervalSince1970:secondTime];    NSDateFormatter *timerFormatter = [[NSDateFormatter alloc] init];    [timerFormatter setDateFormat:@"yyyy年MM月dd日"];    NSString *timeString = [timerFormatter stringFromDate:time];    return timeString;}

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