How to present an Alert in SwiftUI

In this article, I’m going to show you how to present an Alert with SwiftUI 2.0.
We can create an alert very easy in SwiftUI, code like this:

Alert(title: Text("Hello World!"))

struct AlertView: View {
 @State var showAlert = false
 var body: some View {
  HStack {
   Button(action: {
     self.showAlert.toggle()
   }, label: { 
     Text("Show").padding(.trailing)
   })
  }.padding()
   .alert(isPresented: $showAlert, content: {
      Alert(title: Text("Alert Title!"))
  })
 }
}

.alert(isPresented: $showAlert, content: {
    let title = Text("Alert Title!")
    let message = Text("This is an important message")
    Alert(title: title, message: message)
})

To change the button’s text:

.alert(isPresented: $showAlert, content: {
   let button = Alert.Button.default(Text("Close")) {
       print("Button Pressed")
   }
   let title = Text("Alert Title!")
   let message = Text("This is an important message")
   return Alert(title: title, message: message, dismissButton: button)
})

.alert(isPresented: $showAlert, content: {
   let primaryButton = Alert.Button.default(Text("Primary")) {
       print("primary button pressed")
   }
   let secondaryButton = Alert.Button.cancel(Text("Secondary")) {
       print("secondary button pressed")
   }
   let title = Text("Title!")
   let message = Text("This is an important message")
   return Alert(title: title, message: message, primaryButton: primaryButton, secondaryButton: secondaryButton)
})

.alert(isPresented: $showAlert, content: {
   let primaryButton = Alert.Button.destructive(Text("Delete")) {
       print("primary button pressed")
   }
   let secondaryButton = Alert.Button.cancel()
   let title = Text("Title!")
   let message = Text("This is an important message")
   return Alert(title: title, message: message, primaryButton: primaryButton, secondaryButton: secondaryButton)
})