如何将nsmutablesrrsy响应转换为float变量?

大家好，
如何将NSMutableArray数据集转换为float数据集.
下面的代码在我们使用like时显示总数据；

Hi all,
How to convert NSMutableArray dataset into float dataset.
Below code displaying total data when we use like;

Webservices *details=[[Webservices alloc] init];
    [details getMobileNumberDetails:phnotextfield.text];
    NSLog(@"longitudes Arrays from %@",details.resultData);

 "-91.57696007",
     "10.343234",
     "74.982343",
     "76.464844",
     "76.464844",

但是我的目的是我必须将全部数据存储到float变量中.

but my intension is I have to store the total data into float variable.
Help me to solve the problem.