第一种方法：
UIApplication.shared.windows.forEach { (window) in
if window.isKeyWindow {
window.endEditing(true)
}
}
第二种方法：
UIApplication.shared.windows.first?.endEditing(true)
在空白处点击，先生成底部背景使用ZStack包裹
ZStack{
Color.white
.frame(width: ScreenWidth, height: ScreenHeight, alignment: .center)
.onTapGesture {
UIApplication.shared.windows.forEach { (window) in
if window.isKeyWindow {
window.endEditing(true)
}
}
}
}
这里的Color相当于UIView
let window = SceneDelegate().window
let ScreenWidth = window?.bounds.size.width
let ScreenHeight = window?.bounds.size.height
