Interface Builder,@IBOutlet和Swift中委托和dataSource的协议

在Interface Builder中无法将CustomView的委托属性声明为@IBOutlet toViewController – 根本无法建立连接。

这是代码

class CustomView: UIView {
     @IBOutlet var delegate: CustomViewDelegate?
}

@objc protocol CustomViewDelegate {
     ...
}


class ViewController: UIViewController,CustomViewDelegate {
     ...
}

使用@objc因为swift protocol,IBOutlet property cannot have non-object type，不知道为什么协议CustomViewDelegate：class {}不起作用。

还有人碰到过这样的东西吗？

从Xcode发行说明：

Interface Builder does not support connecting to an outlet in a Swift file when the outlet’s type is a protocol.

Workaround: Declare the outlet’s type as AnyObject or NSObject,connect objects to the outlet using Interface Builder,then change the outlet’s type back to the protocol.