Click the button to modify the value nsstring

Now in achieving such an effect, there is a button and a nsstring value, then you can click on this button pops up a keyboard, then the keyboard will be able to find nsstring value recognized the value to modify the value of the input, some have encountered or There are ideas for me to talk about, the best specific point, because I am a novice!
Reply:
You'd better add a textFiled, the interface is a textFiled and a button, click on the pop-up keyboard input textFiled, click button will textFiled in content delivery to your NSString it.

Reply:
In xib file drag down the input and output, and then write the corresponding method on the line!