//切割圖片的某一部分
    func clipImage(_ oldImage:UIImage, frame: CGRect) -> UIImage {
        
        let cgImage = oldImage.cgImage!.cropping(to: frame)
        let image = UIImage(cgImage: cgImage!)
        return image
    }

切圖 代碼

import UIKit

class ViewController: UIViewController {
    
    //上一次點(diǎn)擊的圖片
    var lastImageView: UIImageView?
    //屬性 存值
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //加載圖片
        let path = Bundle.main.path(forResource: "king2", ofType: "png")
        
        let kingImage = UIImage(contentsOfFile: path!)
        
        for i in 0..<3{
        //i表示行
            
            for j in 0..<3{
            //j表示列
                
//                let frame = CGRect(x: 100*CGFloat(j)+100, y: 100*CGFloat(i)+150, width: 100, height: 100)
                
                let frame = CGRect(x: CGFloat(100*j), y: CGFloat(100*i), width: 100, height: 100)
                
                
                
                let currentImage = clipImage(kingImage!, frame: frame)
                let imageView = UIImageView(frame: CGRect(x: CGFloat(100*(j)+10), y: CGFloat(100*(i+1)), width: 100, height: 100))
                
                if i==2 && j==2 {
                    //最后一個(gè)是沒(méi)有圖片
                }else {
                
                    imageView.image = currentImage
                    
                    imageView.layer.borderWidth = 2
                    
                    imageView.layer.borderColor = UIColor.yellow.cgColor
                    
                }
                imageView.isUserInteractionEnabled = true
            
            //添加手勢(shì)
                let gesture = UITapGestureRecognizer(target: self, action: #selector(changePosition(gesture:)) )
                //let g = UITapGestureRecognizer(target: self, action: #selector(tapAction(_:)))
                // selector 變了
                
                imageView.addGestureRecognizer(gesture)
            
            
                view.addSubview(imageView)
            
            }
            
            
        
        }
        
        
        
    }
    
    
    
    func changePosition(gesture: UIGestureRecognizer){
        
        let currentImageView = gesture.view as! UIImageView
         //第一次點(diǎn)擊
        if lastImageView == nil {
            
            lastImageView = currentImageView
        
        }else {//第二次點(diǎn)擊
//          if lastImageView == nil || currentImageView == nil {
             //至少有一個(gè)是空白
            if lastImageView?.image == nil || currentImageView.image == nil {
                //所以是  view.image
            
                
                
                //空白的只能和相鄰的進(jìn)行交換
                //計(jì)算中心點(diǎn)的距離
                let distanceX = fabs((lastImageView?.frame.origin.x)! - currentImageView.frame.origin.x)
                
                let distanceY = fabs((lastImageView?.frame.origin.y)! - currentImageView.frame.origin.y)
                
                
                if (distanceX>1 && distanceY<101)||(distanceY>1 && distanceX<101){
                    //相鄰
                    //交換
                    let frame = currentImageView.frame
                
                    currentImageView.frame = (lastImageView?.frame)!
                    lastImageView?.frame = frame
                
                
                
                }
            
            }
            
            lastImageView = nil
            
        
        }
        
        
        
        
    }
    
 
    
    /*   我寫(xiě)的 态鳖，沒(méi)有添加  相鄰圖片中 一方必須為空
    func changePosition(gesture: UIGestureRecognizer){
        
        
        
        
        if (lastImageView == nil){
            
            lastImageView = gesture.view as! UIImageView?
            
            
        }else {
            
            let frame = gesture.view?.frame
            
            let distanceX = (frame?.origin.x)! - (lastImageView?.frame.origin.x)!
            let disX = distanceX>0 ? distanceX : -distanceX
            
            
            
            let distanceY = (frame?.origin.y)! - (lastImageView?.frame.origin.y)!
            let disY = distanceY>0 ? distanceY : -distanceY
            
            if (99-disX)*(disY-99)>0{
            
            
                gesture.view?.frame = (lastImageView?.frame)!
                lastImageView?.frame = frame!
            
            
            
            }
            
            lastImageView = nil
        
        }
        
        
        
    }
  */
    
    
    
    
    
      //切割圖片的某一部分
    func clipImage(_ oldImage: UIImage, frame: CGRect) -> UIImage{
    
        
        let theCGImage = oldImage.cgImage!.cropping(to: frame)
        let image = UIImage(cgImage: theCGImage!)
        
        return image
    
        
    }
    
    
    
    

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

}