如何在 Swift 中的 UIImageView 中添加文本?
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【中文标题】如何在 Swift 中的 UIImageView 中添加文本?【英文标题】:How to add the text in UIImageView in Swift? 【发布时间】:2015-10-30 06:42:05 【问题描述】:我在编辑 UIImageView 时遇到了一些问题。用户可以在 imageview 中输入文本,然后处理以保存它,之后用户可以查看带有文本的图像。
我该怎么做?
【问题讨论】:
请附上相关代码以帮助我们帮助您。 Manikandan 请在下面查看我的答案。它工作正常。请尝试让我知道。 【参考方案1】:我尝试并得到了在 UIImageview 中添加文本的解决方案。下面是编码
import UIKit
class ViewController: UIViewController,UINavigationControllerDelegate, UIImagePickerControllerDelegate,UIGestureRecognizerDelegate
@IBOutlet var imageViewText: UIImageView!
var dynamicTextViewInsideImageView : UITextView!
var strImageSelected : String!
var picker = UIImagePickerController()
var xValue = CGFloat()
var yValue = CGFloat()
override func viewDidLoad()
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
imageViewText.layer.cornerRadius = 5
imageViewText.layer.borderColor = UIColor.blueColor().CGColor
imageViewText.layer.borderWidth = 1
strImageSelected = ""
override func viewWillAppear(animated: Bool)
let tapRecognizer = UITapGestureRecognizer(target: self, action: Selector("imageTapped:"))
//Add the recognizer to your view.
imageViewText.userInteractionEnabled = true
tapRecognizer.numberOfTapsRequired = 1
imageViewText.addGestureRecognizer(tapRecognizer)
override func didReceiveMemoryWarning()
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
@IBAction func actionPickImage(sender: AnyObject)
var alert:UIAlertController=UIAlertController(title: "Choose Image", message: nil, preferredStyle: UIAlertControllerStyle.ActionSheet)
var cameraAction = UIAlertAction(title: "Camera", style: UIAlertActionStyle.Default)
UIAlertAction in
self.openCamera()
var gallaryAction = UIAlertAction(title: "Gallary", style: UIAlertActionStyle.Default)
UIAlertAction in
self.openGallary()
var cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel)
UIAlertAction in
// Add the actions
picker.delegate = self
alert.addAction(cameraAction)
alert.addAction(gallaryAction)
alert.addAction(cancelAction)
self.presentViewController(alert, animated: true, completion: nil)
func openCamera()
if(UIImagePickerController .isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera))
picker.sourceType = UIImagePickerControllerSourceType.Camera
self .presentViewController(picker, animated: true, completion: nil)
else
let alertWarning = UIAlertView(title:"Warning", message: "You don't have camera", delegate:nil, cancelButtonTitle:"OK", otherButtonTitles:"")
alertWarning.show()
func openGallary()
picker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
self.presentViewController(picker, animated: true, completion: nil)
//PickerView Delegate Methods
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject])
picker .dismissViewControllerAnimated(true, completion: nil)
imageViewText.image=info[UIImagePickerControllerOriginalImage] as? UIImage
strImageSelected = "ImagePicked"
func imagePickerControllerDidCancel(picker: UIImagePickerController)
println("picker cancel.")
strImageSelected = ""
//On the imageView you can add text(Only after you picked the image from Gallery or Camera)
func imageTapped(gestureRecognizer: UITapGestureRecognizer)
if strImageSelected.isEmpty
println("Do not add the textview inside imageview as you have not picked the image from gallery or camera")
else
println("you picked the image successfully")
dynamicTextViewInsideImageView = UITextView(frame: CGRectMake(xValue,yValue,200,50))
dynamicTextViewInsideImageView.backgroundColor = UIColor( red: 0.9, green: 0.9, blue:0.9, alpha: 1.0 )
imageViewText.addSubview( dynamicTextViewInsideImageView)
//TouchEvent for Getting X,Y position once we touch inside the imageview
override func touchesBegan(touches: NSSet, withEvent event: UIEvent)
if let touch = touches.anyObject() as? UITouch
let location = touch.locationInView(imageViewText) as CGPoint
println("the location.x is - \(location.x)")
println("the location.y is - \(location.y)")
xValue = location.x
yValue = location.y
println("the xValue is - \(xValue)")
println("the yValue is - \(yValue)")
【讨论】:
请告诉我拒绝投票的原因。 我的答案是正确的,试试我的答案。如果我的答案不起作用,我将接受否决票。这完全正确。【参考方案2】:试试下面的
func waterMarkedImage(waterMarkText:String, corner:WaterMarkCorner = .BottomRight, margin:CGPoint = CGPoint(x: 20, y: 20), waterMarkTextColor:UIColor = UIColor.whiteColor(), waterMarkTextFont:UIFont = UIFont.systemFontOfSize(20), backgroundColor:UIColor = UIColor.clearColor()) -> UIImage
let textAttributes = [NSForegroundColorAttributeName:waterMarkTextColor, NSFontAttributeName:waterMarkTextFont]
let textSize = NSString(string: waterMarkText).sizeWithAttributes(textAttributes)
var textFrame = CGRectMake(0, 0, textSize.width, textSize.height)
print(textSize.height)
var imageSize = self.size
imageSize = CGSize(width: imageSize.width, height: (imageSize.height+textSize.height))
switch corner
case .TopLeft:
textFrame.origin = margin
case .TopRight:
textFrame.origin = CGPoint(x: imageSize.width - textSize.width - margin.x, y: margin.y)
case .BottomLeft:
textFrame.origin = CGPoint(x: margin.x, y: imageSize.height - textSize.height - margin.y)
case .BottomRight:
textFrame.origin = CGPoint(x: imageSize.width - textSize.width - margin.x, y: imageSize.height - textSize.height - margin.y)
case .Center:
textFrame.origin = CGPoint(x: imageSize.width/2 - textSize.width/2, y: imageSize.height - textSize.height - margin.y)
/// Start creating the image with water mark
//imageSize = CGSize(width: (imageSize.width+textSize.width), height: (imageSize.height+textSize.height))
UIGraphicsBeginImageContext(imageSize)
self.drawInRect(CGRectMake(0, 0, imageSize.width, imageSize.height - textSize.height))
NSString(string: waterMarkText).drawInRect(textFrame, withAttributes: textAttributes)
let waterMarkedImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return waterMarkedImage
【讨论】:
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