Objective-C应用程序中缺少Swift框架中的IBOutlet属性

Question

I have a framework I've written in Swift that contains a class that extends UIView and that has an IBOutlet property.

The class is visible from my Objective-C app, but Interface Builder won't see the IBOutlet. Here's the code:

@objc protocol MyFrameworkDelegate {
    // My delegate methods here
    ...
}

@objc class MyFrameworkClass: UIView {

    @objc @IBOutlet var delegate:MyFrameworkDelegate?
    // The rest of my class here
    ...
}

I set my view's class to MyFrameworkClass in my storyboard, but the delegate outlet isn't showing.

I tried with and without the @objc modifier, no luck. When I inspect my class from Objective-C, the property comes up without the IBOutlet .

Anyone else came across something like that?

EDIT

Here's the code generated by Xcode for the Swift -> Objective-C conversion:

@protocol MyFrameworkDelegate;

SWIFT_CLASS("_Nc9a0xD6MyFrameworkClass")
@interface MyFrameworkClass : UIView
@property (nonatomic) id <MyFrameworkDelegate> delegate;
...

Also, here's the error message I get when I try to run the app:

2014-06-22 21:41:59.095 MyApp Test[75211:17812266] Unknown class MyFrameworkClass in Interface Builder file.
2014-06-22 21:41:59.099 MyApp Test[75211:17812266] -[UIView setDelegate:]: unrecognized selector sent to instance 0xcf5d650
2014-06-22 21:41:59.101 MyApp Test[75211:17812266] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIView setDelegate:]: unrecognized selector sent to instance 0xcf5d650'

EDIT

Here's a screenshot of my storyboard:

Answer 1

您的模块为“ None ，您应该将其选择为相应的值。

Answer 2

reason: '-[UIView setDelegate:]: unrecognized selector

This makes it look like the object in question is an instance of UIView , not MyFrameworkClass . Check the type of the object in IB.

Answer 3

I suspect the word delegate itself is triggering some kind of underlying bug/mechanism/leaky abstraction.

How about calling it myFrameworkDelegate?

I am also wondering if dragging from IB shouldn't always give the best results by itself but I need to fire up Xcode 6 and test manually first to see what happens. New technology :)

Answer 4

Instead of

@objc @IBOutlet var delegate:MyFrameworkDelegate?

use

@IBOutlet var delegate:AnyObject?

than you'll be able to link your class to this property.