How do I respond to swift delegate in my Objective C Project using Cocoa Pods?

Question

I was attempting to use this swift pod in my objective-c project. I got the compiler to recognize the class by using #import "PIDatePicker-swift.h" in my objective-c MyClass.m file, and was able to create a PIDatePicker object, but the method Apple recommends for conforming to the swift protocol, in this case PIDatePickerDelegate, gave me the error: "No type of protocol named PIDatePickerDelegate."

Answer 1

The fix for this was adding the following @objc tag to the swift file protocol definition, in this case, PIDatePickerDelegate.swift:

    public protocol PIDatePickerDelegate {
    func pickerView(pickerView: PIDatePicker, didSelectRow row: Int, inComponent component: Int)
}   

Just changed the above to:

@objc public protocol PIDatePickerDelegate {
    func pickerView(pickerView: PIDatePicker, didSelectRow row: Int, inComponent component: Int)
} 

This is also answered here:

Using a Swift protocol in Objective-C

However, if you're working with a swift podfile, as I was, it's not always clear what to do, and so I am posting this for any others who may be in the same fix. The troubleshooting section of Apple's Using Swift with Objective-C docs also has this line:

• To be accessible and usable in Objective-C, a Swift class must be a descendant of an Objective-C class or it must be marked @objc.