如何将数据从弹出视图控制器发送到主视图控制器。传递一个字符串，以便我可以将其作为主视图中的标签文本

I tried many methods to send data from my popup view controller to main view controller. but failed. can anybody help me with this. i am using a "present as popover" segue. i want to the text entered in textfield of popover view as the label text of main view.I tried many methods to send data from my popup