在IOS中加载webservice中的数据

I'm a newbie in IOS and i'm in small project. In my project i have to load data from Webservice (SOAP) in main controller -> put Data to seacond controller. So, maybe the data load in background thread, the method put data run before the load method. So how i can fix it? this is my code:I'm a newbie in IOS and i'm in small project. I