float 类型的数据如何存进 NSArray NSMutableArray里面

//存入

 1       for (NSDictionary *dic in self.lrcList) {

 2 

 3         int i = 0;

 4 

 5         NSString *timeStr = [dic objectForKey:@"lrctime"];

 6 

 7         NSArray *array = [timeStr componentsSeparatedByString:@":"];//把时间转换成秒

 8 

 9         float currentTime = [array[0] floatValue] * 60 + [array[1] floatValue];

10 

11         NSNumber *number = [NSNumber numberWithFloat:currentTime];

12 

13         //[timearray addObject:number];

14 

15         timearray[i]=number;

16 

17         i++;

18 

19 }

//取出

1 [[timearray objectAtIndex:_numberOfLrc] floatValue]