Question

我想为变量分配多个值。我不知道该怎么做。基本上我想在图像上放置多个文本。

这是单一的分配代码（工作正常）：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
        ImageDisplay.image = textToImage("HERE IS FIRST LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 300))

    }
    dismissViewControllerAnimated(true, completion: nil)

}

我只想为 ImageDisplay.image 分配更多价值。在这里，我可以展示一个（错误的）示例：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
        ImageDisplay.image = textToImage("HERE IS FIRST LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 100))
        ImageDisplay.image = textToImage("HERE IS SECOND LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 200))
        ImageDisplay.image = textToImage("HERE IS THIRD LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 300))            
    }
    dismissViewControllerAnimated(true, completion: nil)

}

这是textToImage函数：

    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: 200)!

    //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
}

Answer 1

我的猜测是将textToImage(...)上的UIImage来电串联起来：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
        var tmpImg = textToImage("HERE IS FIRST LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 100))
        tmpImg = textToImage("HERE IS SECOND LABEL", inImage: tmpImg, atPoint: CGPoint( x: 400, y: 200))
        tmpImg = textToImage("HERE IS THIRD LABEL", inImage: tmpImg, atPoint: CGPoint( x: 400, y: 300))  
        ImageDisplay.image = tmpImg
    }
    dismissViewControllerAnimated(true, completion: nil)
}

Answer 2

每次使用＆＃34; image＆＃34;调用textToImage时您正在使用原始图像中提供的字符串创建新对象，但您想要的是将字符串添加到每个先前构建的图像。所以你可以这样做：

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

   if var image = info[UIImagePickerControllerOriginalImage] as? UIImage {
     image = textToImage("HERE IS FIRST LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 100))
     image = textToImage("HERE IS SECOND LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 200))
     image = textToImage("HERE IS THIRD LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 300))

     ImageDisplay.image = image            
  }
  dismissViewControllerAnimated(true, completion: nil)
}

Answer 3

您的代码意味着：

let a = textToImage("HERE IS FIRST LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 100))
ImageDisplay.image = a
let b = textToImage("HERE IS SECOND LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 200))
ImageDisplay.image = b
let c = textToImage("HERE IS THIRD LABEL", inImage: image, atPoint: CGPoint( x: 400, y: 300))
ImageDisplay.image = c

您的ImageDisplay.image仅存储最后一个数据（c变量）

将a和b保存在某处，以便以后再使用。或将textToImage功能更改为新功能。

修改这个代码工作（我已经测试过了）：

//..somewhere guard let img = UIImage(named:"telephone40.png") else { return }//UIImage.init() // img.size = CGSizeMake(500,500) var tmpImg = textToImage(["HERE IS FIRST LABEL","HERE IS SECOND LABEL","HERE IS THIRD LABEL"], inImage: img, atPoints: [CGPoint( x: 0, y: 10),CGPoint( x: 20, y: 30),CGPoint( x: 40, y: 50)]) //result <<<< //function: func textToImage(drawTexts: [NSString], inImage: UIImage, atPoints:[CGPoint])->UIImage{ // Setup the font specific variables let textColor: UIColor = UIColor.blackColor() let textFont: UIFont = UIFont(name: "Helvetica Bold", size: 200)! //Setups up the font attributes that will be later used to dictate how the text should be drawn let textFontAttributes = [ NSFontAttributeName: textFont, NSForegroundColorAttributeName: textColor, ] //Setup the image context using the passed image. UIGraphicsBeginImageContext(inImage.size) //Put the image into a rectangle as large as the original image. inImage.drawInRect(CGRectMake(0, 0, inImage.size.width, inImage.size.height)) for i in 0..<drawTexts.count { let drawText = drawTexts[i] let atPoint = atPoints[i] // 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 }

Swift上的多个赋值

3 个答案: