升级到Swift 2.0会导致NSCODER错误

Question

I just updated my xcode 6.4 to 7 and converted my old Swift syntax to the latest one. Since then, I, obviously, have been having a lot of errors and could not solve the following error. I screenshotted it.

Does anyone know how to tackle this error issue?

Thank you

Answer 1

The solution:

1. Remove the extra ? on line 15.
2. Add public to your init on line 25.

The explanation:

Your required init must be public because the class is public. By not specifying visibility, it defaults to internal. Line 25 should read:

public required init?(coder aDecoder: NSCoder) {

The reason DShaw's solution worked for him but not for you is because his class had internal visibility while yours is public.

Answer 2

Just delete the first required Init.

The convert process from swift 1.2/1 to 2 in my projects required me to do so as well.

Answer 3

This works fine for me in Xcode 7:

import UIKit

class TextView: UITextView {

internal var placeholderText: String = "Tap to edit"

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
    initialize()
}

required override init(frame: CGRect, textContainer: NSTextContainer?) {
    super.init(frame: frame, textContainer: textContainer)
    initialize()
}

private func initialize()
{
    // whatever
}
}