Refactor IF-Else nested code with switch statement in Swift

I'm trying to improve my swift coding.

I have a fully working if-else nested function which I believe could be better optimised with a Switch Statement. Can anybody advise the correct way to do this code-refactoring ?

Here's my working code:

    if firstButton.frame.contains(location) {
        UIView.animate(withDuration: 0.4) {
            self.firstButton.transform = CGAffineTransform(scaleX: -1, y: 1)
            self.firstButton.alpha = 0
                 if self.tapCount == 0 {self.placeholderText1.textWithAnimation(text: self.firstButton.text!, duration: 0.3);self.tapCount += 1}
            else if self.tapCount == 1 {self.placeholderText2.textWithAnimation(text: self.firstButton.text!, duration: 0.3);self.tapCount += 1}
            else if self.tapCount == 2 {self.placeholderText3.textWithAnimation(text: self.firstButton.text!, duration: 0.3);self.tapCount += 1}
            else if self.tapCount == 3 {self.placeholderText4.textWithAnimation(text: self.firstButton.text!, duration: 0.3);self.tapCount += 1}
            else if self.tapCount == 4 {self.placeholderText5.textWithAnimation(text: self.firstButton.text!, duration: 0.3);self.lastLetterTapped()}
        }
    } else
        if secondButton.frame.contains(location) {
            UIView.animate(withDuration: 0.4) {
                self.secondButton.transform = CGAffineTransform(scaleX: -1, y: 1)
                self.secondButton.alpha = 0
                     if self.tapCount == 0 {self.placeholderText1.textWithAnimation(text: self.secondButton.text!, duration: 0.3);self.tapCount += 1}
                else if self.tapCount == 1 {self.placeholderText2.textWithAnimation(text: self.secondButton.text!, duration: 0.3);self.tapCount += 1}
                else if self.tapCount == 2 {self.placeholderText3.textWithAnimation(text: self.secondButton.text!, duration: 0.3);self.tapCount += 1}
                else if self.tapCount == 3 {self.placeholderText4.textWithAnimation(text: self.secondButton.text!, duration: 0.3);self.tapCount += 1}
                else if self.tapCount == 4 {self.placeholderText5.textWithAnimation(text: self.secondButton.text!, duration: 0.3);self.lastLetterTapped()}
            }
    } else
            if thirdButton.frame.contains(location) {
                UIView.animate(withDuration: 0.4) {
                    self.thirdButton.transform = CGAffineTransform(scaleX: -1, y: 1)
                    self.thirdButton.alpha = 0
                         if self.tapCount == 0 {self.placeholderText1.textWithAnimation(text: self.thirdButton.text!, duration: 0.3);self.tapCount += 1}
                    else if self.tapCount == 1 {self.placeholderText2.textWithAnimation(text: self.thirdButton.text!, duration: 0.3);self.tapCount += 1}
                    else if self.tapCount == 2 {self.placeholderText3.textWithAnimation(text: self.thirdButton.text!, duration: 0.3);self.tapCount += 1}
                    else if self.tapCount == 3 {self.placeholderText4.textWithAnimation(text: self.thirdButton.text!, duration: 0.3);self.tapCount += 1}
                    else if self.tapCount == 4 {self.placeholderText5.textWithAnimation(text: self.thirdButton.text!, duration: 0.3);self.lastLetterTapped()}
                }
            } else
                if fourthButton.frame.contains(location) {
                    UIView.animate(withDuration: 0.4) {
                        self.fourthButton.transform = CGAffineTransform(scaleX: -1, y: 1)
                        self.fourthButton.alpha = 0
                             if self.tapCount == 0 {self.placeholderText1.textWithAnimation(text: self.fourthButton.text!, duration: 0.3);self.tapCount += 1}
                        else if self.tapCount == 1 {self.placeholderText2.textWithAnimation(text: self.fourthButton.text!, duration: 0.3);self.tapCount += 1}
                        else if self.tapCount == 2 {self.placeholderText3.textWithAnimation(text: self.fourthButton.text!, duration: 0.3);self.tapCount += 1}
                        else if self.tapCount == 3 {self.placeholderText4.textWithAnimation(text: self.fourthButton.text!, duration: 0.3);self.tapCount += 1}
                        else if self.tapCount == 4 {self.placeholderText5.textWithAnimation(text: self.fourthButton.text!, duration: 0.3);self.lastLetterTapped()}
                    }
                } else
                    if fifthButton.frame.contains(location) {
                        UIView.animate(withDuration: 0.4) {
                            self.fifthButton.transform = CGAffineTransform(scaleX: -1, y: 1)
                            self.fifthButton.alpha = 0
                                 if self.tapCount == 0 {self.placeholderText1.textWithAnimation(text: self.fifthButton.text!, duration: 0.3);self.tapCount += 1}
                            else if self.tapCount == 1 {self.placeholderText2.textWithAnimation(text: self.fifthButton.text!, duration: 0.3);self.tapCount += 1}
                            else if self.tapCount == 2 {self.placeholderText3.textWithAnimation(text: self.fifthButton.text!, duration: 0.3);self.tapCount += 1}
                            else if self.tapCount == 3 {self.placeholderText4.textWithAnimation(text: self.fifthButton.text!, duration: 0.3);self.tapCount += 1}
                            else if self.tapCount == 4 {self.placeholderText5.textWithAnimation(text: self.fifthButton.text!, duration: 0.3);self.lastLetterTapped()}
                        }

    }