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我在每個視圖中有兩個視圖和一個圖像。在第一個視圖中，我可以使用手勢縮放，旋轉和平移圖像。我想記錄每個這些轉換並將它們轉移到第二個視圖中的圖像，以便第二個圖像與第一個視圖中的第一個圖像顯示在完全相同的位置，但會有相反的縮放（如果第一個圖像圖像放大，然後第二個需要按相同的數量縮小）。如何將圖像的位置和比例轉移到其他視圖？
下面的代碼僅適用於圖像平移或旋轉但未縮放的情況。縮放完全改變圖像中心的位置，代碼不再正常工作。我該如何解決這個問題，使得第二張圖片的中心位置與第一張圖片的中心位置相同，無論縮放比例如何？
這裏的第一個視圖的視圖控制器：然後
import UIKit
class FirstViewController: UIViewController {
// MARK: Properties
@IBOutlet weak var photo: UIImageView!
// Variables for scaling
var max_scale: CGFloat = 3.0
var min_scale: CGFloat = 0.2
var current_scale: CGFloat = 1.0
var lastScale: CGFloat = 0.0
// Position variables
var translate_x: CGFloat = 0.0
var translate_y: CGFloat = 0.0
var scale: CGFloat = 1.0
var angle: CGFloat = 0.0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: Gesture actions
@IBAction func pinchGesture(_ gestureRecognizer: UIPinchGestureRecognizer) {
// Move the achor point of the view's layer to the touch point
// so that scaling the view and the layer becames simpler.
self.adjustAnchorPoint(gestureRecognizer: gestureRecognizer)
// Scale the view by the current scale factor.
if(gestureRecognizer.state == .began) {
// Reset the last scale, necessary if there are multiple objects with different scales
lastScale = gestureRecognizer.scale
}
if (gestureRecognizer.state == .began || gestureRecognizer.state == .changed) {
let currentScale = gestureRecognizer.view!.layer.value(forKeyPath:"transform.scale")! as! CGFloat
// Constants to adjust the max/min values of zoom
let kMaxScale:CGFloat = 15.0
let kMinScale:CGFloat = 1.0
var newScale = 1 - (lastScale - gestureRecognizer.scale)
newScale = min(newScale, kMaxScale/currentScale)
newScale = max(newScale, kMinScale/currentScale)
let transform = (gestureRecognizer.view?.transform)!.scaledBy(x: newScale, y: newScale);
gestureRecognizer.view?.transform = transform
lastScale = gestureRecognizer.scale // Store the previous scale factor for the next pinch gesture call
scale = currentScale
}
}
@IBAction func panGesture(_ gestureRecognizer: UIPanGestureRecognizer) {
// Move the achor point of the view's layer to the touch point
// so that movig the view becomes simpler.
let piece = gestureRecognizer.view
self.adjustAnchorPoint(gestureRecognizer: gestureRecognizer)
// Apply the pan to the view's transform.
if gestureRecognizer.state == .began || gestureRecognizer.state == .changed {
//print((photo.frame.origin.x), (photo.frame.origin.y))
// Get the distance moved since the last call to this method.
let translation = gestureRecognizer.translation(in: piece?.superview)
// Set the translation point to zero so that the translation distance
// is only the change since the last call to this method.
piece?.center = CGPoint(x: ((piece?.center.x)!+translation.x), y: ((piece?.center.y)!+translation.y))
translate_x = (piece?.center.x)!
translate_y = (piece?.center.y)!
gestureRecognizer.setTranslation(CGPoint.zero, in: piece?.superview)
}
}
@IBAction func rotationGesture(_ gestureRecognizer: UIRotationGestureRecognizer) {
// Move the achor point of the view's layer to the center of the
// user's two fingers. This creates a more natural looking rotation.
self.adjustAnchorPoint(gestureRecognizer: gestureRecognizer)
// Apply the rotation to the view's transform.
if gestureRecognizer.state == .began || gestureRecognizer.state == .changed {
gestureRecognizer.view?.transform = (gestureRecognizer.view?.transform.rotated(by: gestureRecognizer.rotation))!
// Set the rotation to 0 to avoid compouding the
// rotation in the view's transform.
angle += gestureRecognizer.rotation
gestureRecognizer.rotation = 0.0
}
}
func adjustAnchorPoint(gestureRecognizer : UIGestureRecognizer) {
if gestureRecognizer.state == .began {
let view = gestureRecognizer.view
let locationInView = gestureRecognizer.location(in: view)
let locationInSuperview = gestureRecognizer.location(in: view?.superview)
// Move the anchor point to the the touch point and change the position of the view
view?.layer.anchorPoint = CGPoint(x: (locationInView.x/(view?.bounds.size.width)!), y: (locationInView.y/(view?.bounds.size.height)!))
view?.center = locationInSuperview
}
}
// MARK: - Navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let resultView = segue.destination as! SecondViewController
resultView.finalImage = photo.image!
resultView.translate_x_ = photo.frame.origin.x + UIScreen.main.bounds.width/2
resultView.translate_y_ = photo.frame.origin.y + UIScreen.main.bounds.height/2
resultView.scale_ = scale
resultView.angle_ = angle
}
}
位置參數傳送到第二視圖控制器是這樣的：
override func viewDidLoad() {
super.viewDidLoad()
editedPhoto.image = finalImage
// Translate
editedPhoto.center = CGPoint(x: (UIScreen.main.bounds.width/2), y: (UIScreen.main.bounds.height/2))
editedPhoto.center = CGPoint(x: (translate_x_), y: (translate_y_))
// Scale
editedPhoto.transform = editedPhoto.transform.scaledBy(x: (1/scale_), y: (1/scale_))
// Rotate
editedPhoto.transform = editedPhoto.transform.rotated(by: angle_)
}