我试图做一个while循环，但输出出错了。代码有什么问题？

Question

事先我说这是为了做作业。任务是检查输入是否是＆＃34; m＆＃34;或＆＃34;我＆＃34;然后循环不会发生。但是，如果这封信不是＆＃34; m＆＃34;或＆＃34;我＆＃34;然后循环继续要求用户输入正确的答案。但是，当我输入不同的输入时，＆＃34; m＆＃34;或＆＃34;我＆＃34;然后它完全绕过循环，即使我需要它。你能找出问题吗？

以下是代码：

import UIKit

class ShowImageViewController: UIViewController {

@IBOutlet weak var mainImageView: UIImageView!
@IBOutlet weak var tempImageView: UIImageView!

private var lastPoint = CGPoint.zero
private var red: CGFloat = 0.0
private var green: CGFloat = 0.0
private var blue: CGFloat = 0.0
private var brushWidth: CGFloat = 10.0
private var opacity: CGFloat = 1.0
private var swiped = false


override func viewDidLoad() {
    super.viewDidLoad()
    mainImageView.image = captureImages[selectedImageindex]
    tempImageView.frame = getImageRect(for: mainImageView)

    // Do any additional setup after loading the view.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    swiped = false
    if let touch = touches.first {
        lastPoint = touch.location(in: tempImageView)
    }
}

override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
    swiped = true
    if let touch = touches.first {
        let currentPoint = touch.location(in: tempImageView)
        drawLineFrom(fromPoint: lastPoint, toPoint: currentPoint)

        lastPoint = currentPoint
    }
}

override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
    if !swiped {
        drawLineFrom(fromPoint: lastPoint, toPoint: lastPoint)
    }

    // Merge tempImageView into mainImageView
    UIGraphicsBeginImageContext(mainImageView.frame.size)
    mainImageView.image?.draw(in: CGRect(x: 0, y: 0, width: mainImageView.frame.size.width, height: mainImageView.frame.size.height), blendMode: .normal, alpha: 1.0)
    tempImageView.image?.draw(in: CGRect(x: 0, y: 0, width: mainImageView.frame.size.width, height: mainImageView.frame.size.height), blendMode: .normal, alpha: opacity)
    mainImageView.image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()

    tempImageView.image = nil
}

func drawLineFrom(fromPoint: CGPoint, toPoint: CGPoint) {
    UIGraphicsBeginImageContext(mainImageView.frame.size)
    let context = UIGraphicsGetCurrentContext()
    tempImageView.image?.draw(in: CGRect(x: 0, y: 0, width: mainImageView.frame.size.width, height: mainImageView.frame.size.height))

    context!.move(to: CGPoint(x: fromPoint.x, y: fromPoint.y))
    context!.addLine(to: CGPoint(x: toPoint.x, y: toPoint.y))
    context!.setLineCap(.round)
    context!.setLineWidth(brushWidth)
    context!.setStrokeColor(red: red, green: green, blue: blue, alpha: 1.0)
    context!.setBlendMode(.normal)

    context!.strokePath()

    tempImageView.image = UIGraphicsGetImageFromCurrentImageContext()
    tempImageView.alpha = opacity
    UIGraphicsEndImageContext()

}

func getImageRect(for imageView: UIImageView) -> CGRect {
    let resVi =  (imageView.image?.size.width)! / (imageView.image?.size.height)!
    let resPl =     imageView.frame.size.width / imageView.frame.size.height
    if resPl > resVi {
        let imageSize = CGSize(width: CGFloat((imageView.image?.size.width)! * imageView.frame.size.height / (imageView.image?.size.height)!), height: CGFloat(imageView.frame.size.height))
        return CGRect(x: CGFloat((imageView.frame.size.width - imageSize.width) / 2), y: CGFloat((imageView.frame.size.height - imageSize.height) / 2), width: CGFloat(imageSize.width), height: CGFloat(imageSize.height))
    }
    else {
        let imageSize = CGSize(width: CGFloat(imageView.frame.size.width), height: CGFloat((imageView.image?.size.height)! * imageView.frame.size.width / (imageView.image?.size.width)!))
        return CGRect(x: CGFloat((imageView.frame.size.width - imageSize.width) / 2), y: CGFloat((imageView.frame.size.height - imageSize.height) / 2), width: CGFloat(imageSize.width), height: CGFloat(imageSize.height))
    }
}
}