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all you need to do is use a #if available
if #available(iOS 13, *) {
		// show Sign In with Apple button
} else {
		// hide Sign In with Apple button
}
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are you trying to make something that uses Apple wallet?
if so, I would start at about 15 minutes into this - https://developer.apple.com/wwdc18/720 session.
if you are trying to do something within your app, you can’t do NFC passes without Apple Wallet, but you can make a QR code. here is a example function that generates a QR code from a string:
func generateQRCode(from string: String) -> UIImage? {
		let data = string.data(using: String.Encoding.ascii)
		if let filter = CIFilter(name: "CIQRCodeGenerator") {
				filter.setValue(data, forKey: "inputMessage")
				let transform = CGAffineTransform(scaleX: 3, y: 3)
				if let output = filter.outputImage?.transformed(by: transform) {
						return UIImage(ciImage: output)
				}
		}
		return nil
}
after you have that function, you use it like this:
let image = generateQRCode(from: "i am going to be so helpful to st0321!")
that generates a QR code with the text "i am going to be so helpful to st0321!" and gives it to you as a UIImage.
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if Apple had plans to do it, they wouldn’t say it until Monday, 😐.
func textViewDidChange(_ textView: UITextView) {
print(textView.text!)
}
}
just use the textViewDidChange(_ textView: UITextView) delegate method that is part of the UITextViewDelegate. this method is called after each little change.
documentation - https://developer.apple.com/documentation/uikit/uitextviewdelegate/1618599-textviewdidchange
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this would be better suited for the main apple community forum - https://discussions.apple.com/welcome.
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this forum is for native ios development.
i do recommend you go to the Stack Overflow Cordova tag - https://stackoverflow.com/questions/tagged/cordova for questions on cordova development.
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i think it would be better if you contacted google about this.
this is a forum for people who make apps on apple's platforms.
