Can't drag and drop item from storyboard to vi

问题:

I started working with xcode a few days ago, and today I tried to connect a textview from the main storyboard to the viewcontroller, but I figured out that its not working.

I am able to ctrl+click to drag the item, but unable to place it in both viewcontroller.h and .m. I double checked that its viewcontroller and not UIViewcontroller, so this is not the case.

I'm using a Yosemite 10.10 mac.

Any kind of help would be appreciated.

回答1:

Select the ViewController in storyboard and change the name of the ViewController to the name in the .h or .m file and then try ctrl+click and drag

回答2:

For beginners -- > make sure you have kept the "Ctrl" key pressed down while dragging and dropping onto the code. This can be easily missed.

回答3:

For me, the solution was to click on the "View" item in the dropdown menu that shows all the subviews for the controller.

Simply clicking on the controller image on the storyboard does not appear to properly "select" the controller for drag and drop abilities, the base view must be selected.

回答4:

Make sure you're in Assistant Editor Mode (When code and layout editor are side-by-side).

From Apple:

With Interface Builder open in the standard editor pane, select the control you want to configure, and click the Assistant Editor button () in the workspace toolbar. The assistant editor opens your object’s implementation file.

Control-drag from the control in Interface Builder to the implementation file. (In the screenshot, the assistant editor displays the implementation file of the view controller for the Warrior button.) Xcode indicates where you can insert an action method in your code.

回答5:

Try this

Select your view in storyboard and click on identity inspector on right side in class enter your view controller name and then drag and drop item from storyboard to view controller then it will work.

Hope it helps.

回答6:

Note that dragging to any point in your code doesn't necessarily work. If you've been unable to drag to create the connection in one spot of your code, try dragging to another spot. For me, I was trying to drag to add a connection in the middle of a function which didn't work. Dragging to the beginning line of a function or in between functions did work.

Note: I'm on Xcode 9.1

回答7:

Hey I think you are not connected your storyboard viewController with your viewController class. check screen shot which "suhit" uploaded in his answer. I would like to tell you something more than it. When ever you need to connect any storyboard object with class.

• first go to utility panel (right side) and then set class there.
• after that you can connect your controls with class

I hope it will help you.

回答8:

Make sure that the item in question is connected to the file in which you want to control drag it to (specify the class in the identity inspector)

回答9:

Check that the names on Viewcontroller identity inspector and the .h, .m files are the same. That worked for me

回答10:

I'm using Xcode 9.2 I had my ViewControlled refactored into sections using the "extension" keyword. It appears you can't control drag into an extension of a ViewController. If you go up to the top part that is in the class definition, control dragging works fine (assuming you did the other things in this thread about making sure the right class is associated with the view controller.

回答11:

I had same problem, I realised I selected wrong story board. If you made app with default settings you will get two story boards (Main and Launch Screen). Labels on Launch screen story board cannot drag drop.