I have problem with capture a custom view. I am trying to set captured image with size UIImage image data's size, but when I take the screenshot the image goes like this ! :
The image shrinks !
Here is the code :
UIGraphicsBeginImageContextWithOptions((self.photoImage.size), false, UIScreen.main.scale)
self.captureView.layer.render(in: UIGraphicsGetCurrentContext()!)
self.photoToShare = UIGraphicsGetImageFromCurrentImageContext()
print(self.photoToShare.size) //the size is right
UIGraphicsEndImageContext()
self.photo.image = self.photoToShare!
What is the problem ?!
I tired :
self.captureView.drawHierarchy(in: self.captureView.bounds , afterScreenUpdates: true)
still no success
EDIT
I tried this method, captured and then crop it but still no success
UIGraphicsBeginImageContextWithOptions(self.captureView.bounds.size, false, UIScreen.main.scale)
self.captureView.drawHierarchy(in: self.captureView.bounds, afterScreenUpdates: true)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
let cropRect = CGRect(x: 0, y: 0, width: (self.photoImage.size.width) , height: (self.photoImage.size.height))
UIGraphicsBeginImageContextWithOptions(cropRect.size, false, UIScreen.main.scale)
image?.draw(in: cropRect)
let finalImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
self.photo.image = finalImage
But image will be distorted :
I've tried to capture screenshot of imageview with aspectToFit content mode & having no constant width & height with below method
func captureShot() {
let layer : CALayer = self.imageView!.layer
UIGraphicsBeginImageContextWithOptions((layer.frame.size), false, 1.0);
layer.render(in: UIGraphicsGetCurrentContext()!)
let screenshot = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
}
& returned screenshot has same image size (229*220) which is original size of image.
Try this:
extension UIView {
var screenCapture: UIImage {
UIGraphicsBeginImageContextWithOptions(bounds.size, opaque, 0.0)
drawViewHierarchyInRect(bounds, afterScreenUpdates: true)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
To put this in a UImageView:
let imageView = UIImageView()
imageView.contentMode = .scaleAspectFit
imageView.image = someView.screenCapture
imageView.frame = someFrame
someSuperview.addSubview(imageView)
(Sorry about all the somes, but hopefully it's not confusing :)
Hope this helps!
Related
I want to screenshot a view and create an UIImage from it. I want the transparency attribute of the view to be maintained in my image. I tried this method after creating an extension of UIImage but the background is not transparent in the resultant image when uploaded to the server.
Kindly help or point me if I am doing something wrong!! This means that the resultant png was not having transparency.
class func createTransparentImageFrom(label: UILabel, imageSize: CGSize) -> UIImage {
UIGraphicsBeginImageContextWithOptions(imageSize, false, 2.0)
let currentView = UIView.init(frame: CGRect(x: 0, y: 0, width: imageSize.width, height: imageSize.height))
currentView.backgroundColor = UIColor.clear
currentView.addSubview(label)
currentView.layer.render(in: UIGraphicsGetCurrentContext()!)
let img = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return img!
}
This was due to the fact that when we render a view the image is JPEG/JPG, so we need to convert it to png in order to get layer information.
Try this :
extension UIImage {
class func createTransparentPNGFrom(label: UILabel, imageSize: CGSize) -> UIImage? {
UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
let currentView = UIView.init(frame: CGRect(x: 0, y: 0, width: imageSize.width, height: imageSize.height))
currentView.backgroundColor = UIColor.clear
currentView.addSubview(label)
currentView.layer.render(in: UIGraphicsGetCurrentContext()!)
let img = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
guard let newImg = img else {
return nil
}
guard let imageData = UIImagePNGRepresentation(newImg) else {
return nil
}
return UIImage.init(data: imageData)
}
}
Swift 5 UIImage extension: screen UIView with transparent background
this is for taking a screenshot of a view which should have .backgroundColor = .clear
extension UIView {
func takeSnapshotOfView() -> UIImage? {
let size = CGSize(width: frame.size.width, height: frame.size.height)
let rect = CGRect.init(origin: .init(x: 0, y: 0), size: frame.size)
UIGraphicsBeginImageContext(size)
drawHierarchy(in: rect, afterScreenUpdates: true)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
guard let imageData = image?.pngData() else {
return nil
}
return UIImage.init(data: imageData)
}
}
You need to put opaque value true for transparent result
Extension of UIView Of transparent screenshot
func screenShot() -> UIImage? {
UIGraphicsBeginImageContextWithOptions(self.bounds.size, true, UIScreen.main.scale)
self.layer.render(in: UIGraphicsGetCurrentContext()!)
let img = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return img
}
I need to make a screenshot of tableview(it has a clear background). But under it, I have one ImageView and blur view as well. I need to get screenshot with all those views.
I tried different solutions, but they did not capture the bottom views. Any ways to do that?
Also, I do not need a full screenshot of the screen. Only bounds which are limited by tableView. I guess, I had some option how to make a full screenshot, but it did not work with view
I tried:
1:
func snapshot(of rect: CGRect? = nil) -> UIImage? {
// snapshot entire view
UIGraphicsBeginImageContextWithOptions(bounds.size, isOpaque, 0)
drawHierarchy(in: bounds, afterScreenUpdates: true)
let wholeImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
// if no `rect` provided, return image of whole view
guard let image = wholeImage, let rect = rect else { return wholeImage }
// otherwise, grab specified `rect` of image
let scale = image.scale
let scaledRect = CGRect(x: rect.origin.x * scale, y: rect.origin.y * scale, width: rect.size.width * scale, height: rect.size.height * scale)
guard let cgImage = image.cgImage?.cropping(to: scaledRect) else { return nil }
return UIImage(cgImage: cgImage, scale: scale, orientation: .up)
}
2:
UIGraphicsBeginImageContext(tableView.frame.size)
tableView.layer.render(in: UIGraphicsGetCurrentContext()!)
let image1 = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
My hierarchy is:
base UIView
UIImageView with image
UIBlurEffect
UITableView with clear background which displays chart
If I understand your question, you want a true screen shot but not of the entire screen. Therefore, take a raw screenshot:
let snap = UIApplication.shared.keyWindow!.snapshotView(afterScreenUpdates: true)
snap.frame = view.bounds // or something, if necessary
Apply a mask to the screenshot with a frame equal to the bounds of the table view:
let mask = CALayer()
mask.frame = tableView.frame.bounds
mask.backgroundColor = UIColor.white.cgColor
snap.layer.mask = mask
I would like to make partial screenshot in my project.
However, I tried the output screenshot is not good that I want to be.
Here is my code.
let size = CGSize(width: 398, height: 300)
UIGraphicsBeginImageContextWithOptions(size, false, 0);
view.layer.render(in: UIGraphicsGetCurrentContext()!)
var sourceImage = UIGraphicsGetImageFromCurrentImageContext()
sourceImage?.draw(at: CGPoint(x: 0, y: 0))
var cropimage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
UIImageWriteToSavedPhotosAlbum(cropimage!,nil,nil,nil)
I would like to save only white View. If I set width and height, the output image is small and does not get completely.
Anyone help me please?
extend UIView and capture an image of that white view
// Untested
import UIKit
extension UIView {
func capture() -> UIImage {
UIGraphicsBeginImageContextWithOptions(self.frame.size, self.opaque, UIScreen.mainScreen().scale)
self.layer.renderInContext(UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
usage:
let whiteImage = myWhiteView.capture()
The image becomes blurry once applying roundImage:
Making a UIImage to a circle form
extension UIImage
{
func roundImage() -> UIImage
{
let newImage = self.copy() as! UIImage
let cornerRadius = self.size.height/2
UIGraphicsBeginImageContextWithOptions(self.size, false, 1.0)
let bounds = CGRect(origin: CGPointZero, size: self.size)
UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius).addClip()
newImage.drawInRect(bounds)
let finalImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return finalImage
}
}
Why are you using bezierpath? Just set cornerradius for uiimageview.
If your image is larger than the imageview then you have to resize your image to your imageview size and then set cornerradius for that uiimageview.
It will work. Works for me
Replace the following line
UIGraphicsBeginImageContextWithOptions(self.size, false, 1.0)
with
UIGraphicsBeginImageContextWithOptions(self.size, view.opaque , 0.0)
try this one
let image = UIImageView(frame: CGRectMake(0, 0, 100, 100))
I recommend that you can use AlamofireImage (https://github.com/Alamofire/AlamofireImage)
It's very easily to make rounded image or circle image without losing quality.
just like this:
let image = UIImage(named: "unicorn")!
let radius: CGFloat = 20.0
let roundedImage = image.af_imageWithRoundedCornerRadius(radius)
let circularImage = image.af_imageRoundedIntoCircle()
Voila!
Your issue is that you are using scale 1, which is the lowest "quality".
Setting the scale to 0 will use the device scale, which just uses the image as is.
A side note: Functions inside a class that return a new instance of that class can be implemented as class functions. This makes it very clear what the function does. It does not manipulate the existing image. It returns a new one.
Since you were talking about circles, I also corrected your code so it will now make a circle of any image and crop it. You might want to center this.
extension UIImage {
class func roundImage(image : UIImage) -> UIImage? {
// copy
guard let newImage = image.copy() as? UIImage else {
return nil
}
// start context
UIGraphicsBeginImageContextWithOptions(newImage.size, false, 0.0)
// bounds
let cornerRadius = newImage.size.height / 2
let minDim = min(newImage.size.height, newImage.size.width)
let bounds = CGRect(origin: CGPointZero, size: CGSize(width: minDim, height: minDim))
UIBezierPath(roundedRect: bounds, cornerRadius: cornerRadius).addClip()
// new image
newImage.drawInRect(bounds)
let finalImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
// crop
let maybeCrop = UIImage.crop(finalImage, cropRect: bounds)
return maybeCrop
}
class func crop(image: UIImage, cropRect : CGRect) -> UIImage? {
guard let imgRef = CGImageCreateWithImageInRect(image.CGImage, cropRect) else {
return nil
}
return UIImage(CGImage: imgRef)
}
}
I am placing a textview on a image. With following code:
var previewImageView=UIImageView()
self.previewImageView.frame = CGRect(x:0, y:0, width:UIScreen.mainScreen().bounds.width, height:UIScreen.mainScreen().bounds.height)
self.view.addSubview(self.previewImageView)
textField = UITextView(frame: CGRect(x: 0, y: self.view.bounds.height/2 - 50, width: self.view.bounds.width, height: 36))
textField.backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.6)
self.view.addSubview(textField)
It works well. But I want to render this image with textview. Then I will save it to gallery.
How can I do this?
Edit:
I tried following code but it is only rendering image not textview:
//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))
// Creating a point within the space that is as bit as the image.
var rect: CGRect = CGRectMake(atPoint.x, atPoint.y, inImage.size.width, inImage.size.height)
//Now Draw the text into an image.
drawText.drawRect(rect)
// Create a new image out of the images we have created
var 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
You can render whole view into an UIImage using CGGraphicsContext. Here is an example of the code:
func imageWithView(view: UIView!) -> UIImage! {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0)
view.layer.renderInContext(UIGraphicsGetCurrentContext())
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
When you pass scale = 0.0 it will take a scale of your screen.
An example of usage:
let image = imageWithView(view)
Code to save image:
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
More information about UIGraphicsContext and image saving can be found here.
Update:
If you want to render only specific views, then you should use CALayer, renderInContext. When you use renderInContext it does not know views.frame and draws at (0:0) in coordinate system, so you should use CGContextTranslateCTM to move coordinate system.
To render only these two views you can do:
UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, 0.0)
let context = UIGraphicsGetCurrentContext()
CGContextTranslateCTM(context, previewImageView.frame.origin.x, previewImageView.frame.origin.y)
previewImageView.layer.renderInContext(context)
CGContextTranslateCTM(context, textField.frame.origin.x - previewImageView.frame.origin.x, textField.frame.origin.y - previewImageView.frame.origin.y)
textField.layer.renderInContext(context)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
Please set opaque true/false as you need. When I was testing in playground I was using not opaque views.
Update 2:
Code which should work in all scenarios:
func imageFromViews(views: [UIView]!, contextSize: CGSize!) -> UIImage {
UIGraphicsBeginImageContextWithOptions(contextSize, false, 0.0)
let context = UIGraphicsGetCurrentContext()
for view in views {
CGContextTranslateCTM(context, view.frame.origin.x, view.frame.origin.y)
view.layer.renderInContext(UIGraphicsGetCurrentContext())
CGContextTranslateCTM(context, -view.frame.origin.x, -view.frame.origin.y)
}
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}