OC系统类型各种转换

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#pragma mark - //字符串->数组 && 数组->字符串+ (NSString *)stringbyReversString:(NSString *)string{    //定义一个空的可变字符串    NSMutableString *str = [NSMutableString string];    //给每个字符后面加一个字符    for (int i = 0; i < string.length; i ++) {        char ch = [string characterAtIndex:i];        [str appendFormat:@"%c-",ch];    }    //删除最后一个字符    [str deleteCharactersInRange:NSMakeRange(str.length - 1,1)];    //将字符串添加到数组中    NSArray *array = [str componentsSeparatedByString:@"-"];    NSMutableArray *mutablearray = [NSMutableArray array];    [mutablearray addObjectsFromArray:array];    //改变数组，倒置！！！（随便怎么改变就在这里改变）    //---------------------------    [mutablearray exchangeObjectAtIndex:0 withObjectAtIndex:array.count - 1];    //---------------------------    //将数组转换为字符串    NSMutableString *str1 = [NSMutableString string];    for (id object in mutablearray){        [str1 appendFormat:@"%@",object];    }    return str1;}

#pragma mark - 字符串和数组的互相转换    //字符串 -> 数组    NSString *string = [NSString stringWithFormat:@"101010-1021s-ad30-2132ada38-13221-1"];    NSArray *array = [string componentsSeparatedByString:@"-"];    NSLog(@"%@",array);    //数组 -> 字符串    NSMutableString *newstring = [NSMutableString string];    for (id object in array){        NSLog(@"%@",object);        [newstring appendFormat:@"%@",object];    }    NSLog(@"%@",newstring);    #pragma mark - 字符串和NSNumber的互相转换        NSNumber *number2 = @12213123;    NSNumberFormatter *fomatter = [[NSNumberFormatter alloc]init];    //    [fomatter setNumberStyle:NSNumberFormatterSpellOutStyle];    NSString *string2 = [fomatter stringFromNumber:number2];    NSNumber *number20 = [fomatter numberFromString:string2];    NSLog(@"%@",number20);    NSLog(@"%@",string2);        NSString *string3 = @"111";    NSNumber *number3 = [NSNumber numberWithInt:[string3 intValue]];    NSLog(@"%@",number3);    [fomatter release];}

    //字符串->数组->字符串    NSString *str1 = @"one,two,three";    NSArray *array = [str1 componentsSeparatedByString:@","];    NSString *str2 = [array componentsJoinedByString:@"-"];    NSLog(@"%@",str2);

        //NSDate -> NSString        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];                //设定时间格式,这里可以设置成自己需要的格式                [dateFormatter setDateFormat:@"yyyy年MM月dd日 HH:mm:ss"];        NSDate *date = [NSDate dateWithTimeIntervalSinceNow:0];                NSString *currentDateStr = [dateFormatter stringFromDate:date];        //输出格式为：2014年12月22日 13:48:52                NSLog(@"%@",currentDateStr);

        //NSString ->NSDate        NSString *string = [NSString stringWithFormat:@"19931003"];        NSDateFormatter *fomatter = [[NSDateFormatter alloc]init];        [fomatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:8]];        [fomatter setDateFormat:@"yyyyMMdd"];        NSDate *date = [fomatter dateFromString:string];        NSLog(@"%@",date);

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