環境
-xcode8
-swift3
実装
import UIKit
let imageView = UIImageView()
var preDx : CGFloat!
var preDy : CGFloat!
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let topImage:UIImage = UIImage(named:"topImage")!
let bottomImage:UIImage = UIImage(named: "bottomImage")!
let newSize = CGSize(width:bottomImage.size.width, height:bottomImage.size.height)
UIGraphicsBeginImageContextWithOptions(newSize, false, bottomImage.scale)
bottomImage.draw(in: CGRect(x:0,y:0,width:newSize.width,height:newSize.height))
topImage.draw(in: CGRect(x:0,y:0,width:newSize.width,height:newSize.height),blendMode:CGBlendMode.normal, alpha:1.0)
let newImage:UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
let screenWidth:CGFloat = view.frame.size.width
let screenHeight:CGFloat = view.frame.size.height
//画像をイメージに追加
//imageView.image = UIImage(named:"topImage")!
//合成した画像をイメージに追加
imageView.image = newImage
let newRect = CGRect(x:0, y:0, width:200, height:200)
imageView.frame = newRect
imageView.center = CGPoint(x:screenWidth/2, y:screenHeight/2)
self.view.addSubview(imageView)
imageView.isUserInteractionEnabled = true
let panGestureRecognizer06 = UIPanGestureRecognizer(target: self, action: #selector(panGesture06(sender:)))
imageView.addGestureRecognizer(panGestureRecognizer06)
}
func panGesture06(sender:UIPanGestureRecognizer) {
if sender.state == UIGestureRecognizerState.began {
preDx = imageView.frame.origin.x
preDy = imageView.frame.origin.y
}
let point: CGPoint = sender.translation(in: self.view)
let movedPoint: CGPoint = CGPoint(x: sender.view!.center.x + point.x, y: sender.view!.center.y + point.y)
//print(movedPoint)
sender.view!.center = movedPoint
sender.setTranslation(CGPoint.zero, in: self.view)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}