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並前往https://supereasyapps.com/blog/2015/7/24/how-to-get-uitextfield-text-changed-events-for-your-validation-logic-swift-tips-1

How to Get UITextField Text Editing Changed Events for User ...

The Target/Action method names have changed in Swift 3, ... As a simple example, just enable or disable the button based on your validation ...

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