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並前往https://docs.microsoft.com/zh-tw/dotnet/api/uikit.uiresponder.becomefirstresponder?view=xamarin-ios-sdk-12

UIResponder.BecomeFirstResponder Method (UIKit)

BecomeFirstResponder Method. Definition. Namespace: UIKit ... Export("becomeFirstResponder")] public virtual bool BecomeFirstResponder ();

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