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我有以下在該應用功能：裁剪具有相同的CGRect相同的UIImage給出不同的結果
- 用戶採取（或選擇）的圖像（以下
originalImage）。 originalImage被髮送到一些外部API，它返回我需要添加到originalImage的點的座標數組。- 由於點總是位於一個區域（面部），因此我想在靠近面部邊框處裁剪
originalImage並僅向用戶顯示裁剪的結果。 - 裁剪結果顯示後，我逐個添加點。
這裏是一個沒有工作的代碼（除發送圖像，讓我們說這已經發生）
class ScanResultViewController{
@IBOutlet weak var scanPreviewImageView: UIImageView!
let originalImage = ORIGINAL_IMAGE //meaning we already have it
let scanDots = [["x":123, "y":123], ["x":234, "y":234]]//total 68 coordinates
var cropRect:CGRect!
override func viewDidLoad() {
super.viewDidLoad()
self.setScanImage()
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
self.animateScan(0)
}
func setScanImage(){
self.cropRect = self.getCropRect(self.scanDots, sourceImage:self.originalImage)
let croppedImage = self.originalImage.imageAtRect(self.cropRect)
self.scanPreviewImageView.image = croppedImage
self.scanPreviewImageView.contentMode = .ScaleAspectFill
}
func animateScan(index:Int){
let i = index
self.originalImage = self.addOnePointToImage(self.originalImage, pointImage: GREEN_DOT!, point: self.scanDots[i])
let croppedImage = self.originalImage.imageAtRect(self.cropRect)
self.scanPreviewImageView.image = croppedImage
self.scanPreviewImageView.contentMode = .ScaleAspectFill
if i < self.scanDots.count-1{
let delay = dispatch_time(DISPATCH_TIME_NOW, Int64(0.1 * Double(NSEC_PER_SEC)))
dispatch_after(delay, dispatch_get_main_queue()) {
self.animateScan(i+1)
}
}
}
func addOnePointToImage(sourceImage:UIImage, pointImage:UIImage, point: Dictionary<String,CGFloat>)->UIImage{
let rect = CGRect(x: 0, y: 0, width: sourceImage.size.width, height: sourceImage.size.height)
UIGraphicsBeginImageContextWithOptions(sourceImage.size, true, 0)
let context = UIGraphicsGetCurrentContext()
CGContextSetFillColorWithColor(context, UIColor.whiteColor().CGColor)
CGContextFillRect(context, rect)
sourceImage.drawInRect(rect, blendMode: .Normal, alpha: 1)
let pointWidth = sourceImage.size.width/66.7
pointImage.drawInRect(CGRectMake(point["x"]!-pointWidth/2, point["y"]!-pointWidth/2, pointWidth, pointWidth), blendMode: .Normal, alpha: 1)
let result = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return result
}
func getCropRect(points: Array<Dictionary<String,CGFloat>>, sourceImage:UIImage)->CGRect{
var topLeft:CGPoint = CGPoint(x: points[0]["x"]!, y: points[0]["y"]!)
var topRight:CGPoint = CGPoint(x: points[0]["x"]!, y: points[0]["y"]!)
var bottomLeft:CGPoint = CGPoint(x: points[0]["x"]!, y: points[0]["y"]!)
var bottomRight:CGPoint = CGPoint(x: points[0]["x"]!, y: points[0]["y"]!)
for p in points{
if p["x"]<topLeft.x {topLeft.x = p["x"]!}
if p["y"]<topLeft.y {topLeft.y = p["y"]!}
if p["x"]>topRight.x {topRight.x = p["x"]!}
if p["y"]<topRight.y {topRight.y = p["y"]!}
if p["x"]<bottomLeft.x {bottomLeft.x = p["x"]!}
if p["y"]>bottomLeft.y {bottomLeft.y = p["y"]!}
if p["x"]>bottomRight.x {bottomRight.x = p["x"]!}
if p["y"]>bottomRight.y {bottomRight.y = p["y"]!}
}
let rect = CGRect(x: topLeft.x, y: topLeft.y, width: (topRight.x-topLeft.x), height: (bottomLeft.y-topLeft.y))
return rect
}
}
extension UIImage{
public func imageAtRect(rect: CGRect) -> UIImage {
let imageRef: CGImageRef = CGImageCreateWithImageInRect(self.CGImage, rect)!
let subImage: UIImage = UIImage(CGImage: imageRef)
return subImage
}
}
的問題是在setScanImage所需區域精確裁剪並顯示，但是當animateScan方法被調用時，同一圖像的不同區域被裁剪（並顯示），雖然cropRect是相同的，並且originalImage的大小完全相同。
任何想法，傢伙？
順便說一句，如果我顯示originalImage沒有裁剪它一切順利。