如何在拍摄的照片上画线？

我想在select/拍摄照片后在文本下绘制白线。 我看到了一些例子，但他们不能用我的代码工作，所以我需要问。 基本上在照片之后，在照片的顶部会有白色的宽线。 我想我会在textToImage函数中写入drawRect 。 我不确定。

import UIKit class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate { @IBOutlet weak var PhotoLibrary: UIButton! @IBOutlet weak var Camera: UIButton! @IBOutlet weak var ImageDisplay: UIImageView! @IBOutlet weak var CustomerTextBox: UITextField! @IBOutlet weak var ResponsibleTextBox: UITextField! @IBOutlet weak var LocationTextBox: UITextField! @IBOutlet weak var DescriptionTextBox: UITextField! override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } @IBAction func PhotoLibraryAction(sender: UIButton) { let picker = UIImagePickerController() picker.delegate = self picker.sourceType = .PhotoLibrary presentViewController(picker, animated: true, completion: nil) } @IBAction func CameraAction(sender: UIButton) { let picker = UIImagePickerController() picker.delegate = self picker.sourceType = .Camera presentViewController(picker, animated: true, completion: nil) } func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { if var image = info[UIImagePickerControllerOriginalImage] as? UIImage { image = textToImage(CustomerTextBox.text!, inImage: image, atPoint: CGPoint( x: 100, y: 50)) image = textToImage(ResponsibleTextBox.text!, inImage: image, atPoint: CGPoint( x: 1000, y: 50)) image = textToImage(LocationTextBox.text!, inImage: image, atPoint: CGPoint( x: 3000, y: 50)) image = textToImage(DescriptionTextBox.text!, inImage: image, atPoint: CGPoint( x: 100, y: 200)) ImageDisplay.image = image } dismissViewControllerAnimated(true, completion: nil) } func textToImage(drawText: NSString, inImage: UIImage, atPoint:CGPoint)->UIImage{ // Setup the font specific variables let textColor: UIColor = UIColor.blackColor() let textFont: UIFont = UIFont(name: "Helvetica Bold", size: 150)! //Setup the image context using the passed image. UIGraphicsBeginImageContext(inImage.size) //Setups up the font attributes that will be later used to dictate how the text should be drawn let textFontAttributes = [ NSFontAttributeName: textFont, NSForegroundColorAttributeName: textColor, ] //Put the image into a rectangle as large as the original image. inImage.drawInRect(CGRectMake(0, 0, inImage.size.width, inImage.size.height)) // Creating a point within the space that is as bit as the image. let rect: CGRect = CGRectMake(atPoint.x, atPoint.y, inImage.size.width, inImage.size.height) //Now Draw the text into an image. drawText.drawInRect(rect, withAttributes: textFontAttributes) // Create a new image out of the images we have created let newImage: UIImage = UIGraphicsGetImageFromCurrentImageContext() // End the context now that we have the image we need UIGraphicsEndImageContext() //And pass it back up to the caller. return newImage } } 

我在这里find了一些东西，我会在下面添加新的功

  func drawRect(rect: CGRect) { let context = UIGraphicsGetCurrentContext() CGContextMoveToPoint(context, 100, 100) CGContextAddLineToPoint(context, 150, 150) CGContextAddLineToPoint(context, 100, 200) CGContextAddLineToPoint(context, 50, 150) CGContextAddLineToPoint(context, 100, 100) CGContextSetFillColorWithColor(context, UIColor.redColor().CGColor) CGContextFillPath(context) } 

我不知道我该写什么：

  func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { if var image = info[UIImagePickerControllerOriginalImage] as? UIImage { image = textToImage(CustomerTextBox.text!, inImage: image, atPoint: CGPoint( x: 100, y: 50)) image = textToImage(ResponsibleTextBox.text!, inImage: image, atPoint: CGPoint( x: 1000, y: 50)) image = textToImage(LocationTextBox.text!, inImage: image, atPoint: CGPoint( x: 3000, y: 50)) image = textToImage(DescriptionTextBox.text!, inImage: image, atPoint: CGPoint( x: 100, y: 200)) image = drawRect("WHATWILLBEHERE") ImageDisplay.image = image } dismissViewControllerAnimated(true, completion: nil) } 

Answer 1

这适用于我，但我用swift 3，我认为你将能够迅速转换2

  func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) { if let image = info[UIImagePickerControllerOriginalImage] as? UIImage { ImageDisplay.image = image if ImageDisplay.layer.sublayers != nil { for layer : CALayer in ImageDisplay.layer.sublayers! { layer.removeFromSuperlayer() } } textToImage(drawText: CustomerTextBox.text!, inImage: ImageDisplay, atPoint: CGPoint(x: ImageDisplay.bounds.midX, y: ImageDisplay.bounds.midY)) } dismiss(animated: true, completion: nil) } func lineUnderText(myTextPosition: CGRect) { let path = UIBezierPath() path.move(to: CGPoint(x: myTextPosition.minX, y: myTextPosition.maxY + 4)) path.addLine(to: CGPoint(x: myTextPosition.maxX, y: myTextPosition.maxY + 4)) let shape = CAShapeLayer() shape.path = path.cgPath shape.strokeColor = UIColor.white.cgColor shape.fillColor = UIColor.clear.cgColor shape.lineWidth = 2 shape.lineCap = kCALineCapRound ImageDisplay.layer.addSublayer(shape) } func textToImage(drawText: String, inImage: UIImageView, atPoint:CGPoint){ let myLabel = UILabel() myLabel.text = drawText myLabel.textColor = UIColor.black myLabel.font = UIFont(name: "Helvetica Bold", size: 25) print(drawText.characters.count) let W = myLabel.intrinsicContentSize.width let H = myLabel.intrinsicContentSize.height myLabel.frame = CGRect(x: atPoint.x - W/2 , y: atPoint.y - H/2, width: W, height: 28) inImage.addSubview(myLabel) lineUnderText(myTextPosition: myLabel.frame) } 

OK Swift 2

  func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { if let image = info[UIImagePickerControllerOriginalImage] as? UIImage { ImageDisplay.image = image if ImageDisplay.layer.sublayers != nil { for layer : CALayer in ImageDisplay.layer.sublayers! { layer.removeFromSuperlayer() } } textToImage(CustomerTextBox.text!, inImage: ImageDisplay, atPoint: CGPoint(x: ImageDisplay.bounds.midX, y: ImageDisplay.bounds.midY)) } dismissViewControllerAnimated(true, completion: nil) } func lineUnderText(myTextPosition: CGRect) { let path = UIBezierPath() path.moveToPoint( CGPoint(x: myTextPosition.minX, y: myTextPosition.maxY + 4)) path.addLineToPoint( CGPoint(x: myTextPosition.maxX, y: myTextPosition.maxY + 4)) let shape = CAShapeLayer() shape.path = path.CGPath shape.strokeColor = UIColor.whiteColor().CGColor shape.fillColor = UIColor.clearColor().CGColor shape.lineWidth = 2 shape.lineCap = kCALineCapRound ImageDisplay.layer.addSublayer(shape) } func textToImage(drawText: String, inImage: UIImageView, atPoint:CGPoint){ let myLabel = UILabel() myLabel.text = drawText myLabel.textColor = UIColor.blackColor() myLabel.font = UIFont(name: "Helvetica Bold", size: 25) let W = myLabel.intrinsicContentSize().width let H = myLabel.intrinsicContentSize().height myLabel.frame = CGRect(x: atPoint.x - W/2 , y: atPoint.y - H/2, width: W, height: 28) inImage.addSubview(myLabel) lineUnderText( myLabel.frame) } 

我希望能帮助你