import SwiftUI

#if canImport(UIKit)
extension View {
    func hideKeyboard() {
        UIApplication.shared.sendAction(#selector(UIResponder.resignFirstResponder), to: nil, from: nil, for: nil)
    }
}
#endif

参考项目: https://github.com/dongxiexidu/SwiftUI_Udemy 中Devote_SwiftUI项目