Pinch 제스처로 이미지 확대 축소하기

https://zeddios.tistory.com/343 Pinch 기본적인 코드는 해당 블로그 참고해서 작성

 

https://github.com/iOS-junsoo/Pinch 깃헙주소

 

1. 제한 없이 이미지 확대 축소하기 

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        myView.isUserInteractionEnabled = true
        
    }
    
    var recognizerScale: CGFloat = 1.0
    var maxScale: CGFloat = 2.0
    var minScale: CGFloat = 1.0
    
    @IBOutlet weak var myView: UIView!
    @IBOutlet var PinchGestureRecognizer: UIPinchGestureRecognizer!
    @IBAction func pinchAction(_ sender: Any) {
        
        myView.transform = myView.transform.scaledBy(x: PinchGestureRecognizer.scale, y: PinchGestureRecognizer.scale)
        PinchGestureRecognizer.scale = 1.0
 
        
    }
    
    
    

}

 

 

 

 

2. 확대 축소 크기 제한두기 

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        myView.isUserInteractionEnabled = true
        
    }
    
    var recognizerScale: CGFloat = 1.0
    var maxScale: CGFloat = 2.0 
    var minScale: CGFloat = 1.0
    
    @IBOutlet weak var myView: UIView!
    @IBOutlet var PinchGestureRecognizer: UIPinchGestureRecognizer!
    @IBAction func pinchAction(_ sender: Any) {

        if PinchGestureRecognizer.state == .began || PinchGestureRecognizer.state == .changed{
            if recognizerScale < maxScale && PinchGestureRecognizer.scale > 1.0 {
                myView.transform = myView.transform.scaledBy(x: PinchGestureRecognizer.scale, y: PinchGestureRecognizer.scale)
                recognizerScale *= PinchGestureRecognizer.scale
                PinchGestureRecognizer.scale = 1.0
            }
            
            else if recognizerScale > minScale && PinchGestureRecognizer.scale < 1.0 {
                myView.transform = myView.transform.scaledBy(x: PinchGestureRecognizer.scale, y: PinchGestureRecognizer.scale)
                recognizerScale *= PinchGestureRecognizer.scale
                PinchGestureRecognizer.scale = 1.0
            }
        }
        
    }
    
    
    

}

 

 

 

 

3. 확대 축소 제한두고 너무 축소했을 때 원래대로 복귀 

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        myView.isUserInteractionEnabled = true
        
    }
    
    var recognizerScale: CGFloat = 1.0 //이미지 스케일의 크기
    var maxScale: CGFloat = 2.0
    var minScale: CGFloat = 1.0
    
    @IBOutlet weak var myView: UIView!
    @IBOutlet var PinchGestureRecognizer: UIPinchGestureRecognizer!// 두 손가락의 거리
    @IBAction func pinchAction(_ sender: Any) {
        
        
    
        if PinchGestureRecognizer.state == .began || PinchGestureRecognizer.state == .changed{
            if recognizerScale < maxScale && PinchGestureRecognizer.scale > 1.0 {
                myView.transform = myView.transform.scaledBy(x: PinchGestureRecognizer.scale, y: PinchGestureRecognizer.scale)
                recognizerScale *= PinchGestureRecognizer.scale
                PinchGestureRecognizer.scale = 1.0
            }
            
            else if recognizerScale > 0.5 && PinchGestureRecognizer.scale < 1.0 {
                myView.transform = myView.transform.scaledBy(x: PinchGestureRecognizer.scale, y: PinchGestureRecognizer.scale)
                recognizerScale *= PinchGestureRecognizer.scale
                PinchGestureRecognizer.scale = 1.0
                
                
            }
            
            
        }
        else {
            if recognizerScale < minScale  {
                myView.transform = CGAffineTransform.identity
                                PinchGestureRecognizer.scale = 1.0
            }
        }
        
    }
    
    
    

}