当我擦除图像时，它正常工作。但是在放大/缩小图像后，当我尝试擦除时，图像会被擦除但同时会缩小。我做错了什么？ 这是我的代码。
import UIKit
import CoreGraphics
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
var imageView = UIImageView()
var offsetImageView = UIImageView()
let offset = "Circle_Red.png"
let offsetImage = UIImage(named: "Circle_Red.png")
var eraserImageView = UIImageView()
var chosenImage = UIImage()
var swiped = false
var location = CGPoint(x: 0, y: 0)
var eraserEnabled = false
var lastPoint = CGPoint(x: 0, y: 0)
var isZoomable = false
var isMovable1 = true
var red: UIColor = UIColor.redColor()
var green: CGFloat = 0.0
var blue: CGFloat = 0.0
var opacity: CGFloat = 1.0
@IBOutlet weak var tempImageView: UIImageView!
@IBOutlet weak var myImageView: UIImageView!
let picker = UIImagePickerController()
@IBAction func chooseFromGallery(sender: UIBarButtonItem) {
picker.allowsEditing = false //2
picker.sourceType = .PhotoLibrary //3
picker.modalPresentationStyle = .Popover
presentViewController(picker,
animated: true, completion: nil)//4
picker.popoverPresentationController?.barButtonItem = sender
}
@IBAction func captureCamera(sender: UIBarButtonItem) {
if UIImagePickerController.availableCaptureModesForCameraDevice(.Rear) != nil {
picker.allowsEditing = false
picker.sourceType = UIImagePickerControllerSourceType.Camera
picker.cameraCaptureMode = .Photo
presentViewController(picker, animated: true, completion: nil)
} else {
noCamera()
}
}
func noCamera(){
let alertVC = UIAlertController(
title: "No Camera",
message: "Sorry, this device has no camera",
preferredStyle: .Alert)
let okAction = UIAlertAction(
title: "OK",
style:.Default,
handler: nil)
alertVC.addAction(okAction)
presentViewController(alertVC,
animated: true,
completion: nil)
}
override func viewDidLoad() {
super.viewDidLoad()
picker.delegate = self
offsetImageView = UIImageView(image: offsetImage!)
offsetImageView.frame = CGRect(x: 0, y: 0, width: 15, height: 15)
view.addSubview(offsetImageView)
eraserImageView.frame = CGRect(x: 0, y: 0, width: CGFloat(eraserSize!), height: CGFloat(eraserSize!))
view.addSubview(eraserImageView)
self.eraserImageView.layer.cornerRadius = 15.0
self.eraserImageView.clipsToBounds = true
self.eraserImageView.layer.borderWidth = 2.0
self.eraserImageView.layer.borderColor = UIColor.redColor().CGColor
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
var imageHeight : CGFloat = 0.0
var imageWidth : CGFloat = 0.0
func imagePickerController(
picker: UIImagePickerController,
didFinishPickingMediaWithInfo info: [String : AnyObject])
{
let chosenImage = info[UIImagePickerControllerOriginalImage] as! UIImage //2
myImageView.contentMode = .ScaleAspectFit //3
myImageView.image = chosenImage //4
dismissViewControllerAnimated(true, completion: nil) //5
imageHeight = chosenImage.size.height
imageWidth = chosenImage.size.width
}
func imagePickerControllerDidCancel(picker: UIImagePickerController) {
dismissViewControllerAnimated(true, completion: nil)
}
@IBAction func share(sender: AnyObject) {
UIGraphicsBeginImageContext(myImageView.bounds.size)
myImageView.image?.drawInRect(CGRect(x: 0, y: 0,
width: myImageView.frame.size.width, height: myImageView.frame.size.height))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
let activity = UIActivityViewController(activityItems: [image], applicationActivities: nil)
presentViewController(activity, animated: true, completion: nil)
}
@IBAction func zoomBtn(sender: UIBarButtonItem) {
isMovable1 = true
eraserEnabled = false
isZoomable = true
}
@IBAction func backgroundEraserBtn(sender: UIBarButtonItem) {
isMovable1 = false
isZoomable = false
eraserEnabled = true
print (imageHeight)
print (imageWidth)
}
var m = CGFloat()
@IBAction func zoomImage(sender: UIPinchGestureRecognizer) {
if isZoomable == true {
let m = CGAffineTransformScale(self.myImageView.transform, sender.scale, sender.scale)
self.myImageView.transform = m
sender.scale = 1
}
}
var eraserSize : Float? = 60//35.0
var offsetDistance : Float? = 120 //80.0
@IBAction func sliderSizeChanged(sender: UISlider) {
eraserSize = sender.value
print(eraserSize)
eraserImageView.frame = CGRect(x: 0, y: 0, width: CGFloat(eraserSize!), height: CGFloat(eraserSize!))
}
@IBAction func sliderOffsetChanged(sender: AnyObject) {
offsetDistance = sender.value
print(offsetDistance)
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
if isMovable1 == true {
let touch: UITouch = touches.first!
location = touch.locationInView(self.view)
myImageView.center = location
}
if eraserEnabled == true
{
if let touch: UITouch = touches.first! {
lastPoint = touch.locationInView(self.view)
offsetImageView.center = lastPoint
location = touch.locationInView(self.view)
location.y = location.y - CGFloat(offsetDistance!)
eraserImageView.center = location
}
}
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
if isMovable1 == true {
let touch: UITouch = touches.first!
location = touch.locationInView(self.view)
myImageView.center = location
}
if eraserEnabled == true
{
if let touch: UITouch = touches.first!
{
lastPoint = touch.locationInView(self.view)
offsetImageView.center = lastPoint
location = touch.locationInView(self.view)
location.y = location.y - CGFloat(offsetDistance!)
eraserImageView.center = location
let currentPoint = touch.locationInView(self.myImageView)
print(String(currentPoint) + " ")
UIGraphicsBeginImageContext(self.myImageView.frame.size)
self.myImageView.image?.drawInRect(CGRectMake(0, 0, self.myImageView.frame.width, self.myImageView.frame.height))
CGContextSaveGState(UIGraphicsGetCurrentContext())
CGContextSetShouldAntialias(UIGraphicsGetCurrentContext(), true)
CGContextSetLineCap(UIGraphicsGetCurrentContext(), CGLineCap.Round)
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), CGFloat(eraserSize!))
let path = CGPathCreateMutable()
CGPathMoveToPoint(path, nil, currentPoint.x, (currentPoint.y - CGFloat(offsetDistance!)))
print( "lastpoint: " + String(lastPoint))
CGPathAddLineToPoint(path, nil, currentPoint.x, (currentPoint.y - CGFloat(offsetDistance!)))
CGContextSetBlendMode(UIGraphicsGetCurrentContext(), CGBlendMode.Clear)
CGContextAddPath(UIGraphicsGetCurrentContext(), path)
CGContextStrokePath(UIGraphicsGetCurrentContext())
myImageView.image = UIGraphicsGetImageFromCurrentImageContext()
CGContextRestoreGState(UIGraphicsGetCurrentContext())
UIGraphicsEndImageContext()
lastPoint = currentPoint
}
}
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
}
@IBAction func continueBtn(sender: AnyObject) {
performSegueWithIdentifier("toAddAnotherPhotoAsBackground", sender: nil)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "toAddAnotherPhotoAsBackground" {
let segueCtrl = segue.destinationViewController as! AddPhotoBackgroundViewController
segueCtrl.editedImage = myImageView.image
}
}
}
答案 0 :(得分：0)
我在你的代码中发现了这个错误......请你看看这一行 让selectedImage = info [UIImagePickerControllerOriginalImage]为！的UIImage 此行会导致擦除图像设置为原始图像 像这样改变这条线 让selectedImage = info [UIImagePickerControllerEditedImage]为！的UIImage 我希望这很好...... 也可以看到 picker.allowsEditing = false // 2 这一行 这一行必须像这样**** picker.allowsEditing = true ** // 2 ** 我猜这是错误