UIImage* image = nil;
UIGraphicsBeginImageContextWithOptions(scrollView.contentSize, YES, 0);
{
CGPoint savedContentOffset = scrollView.contentOffset;
CGRect savedFrame = scrollView.frame;
scrollView.contentOffset = CGPointZero;
scrollView.frame= CGRectMake(0, 0, scrollView.contentSize.width,scrollView.contentSize.height);
[scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
image = UIGraphicsGetImageFromCurrentImageContext();
scrollView.contentOffset = savedContentOffset;
scrollView.frame = savedFrame;
}
UIGraphicsEndImageContext();
I can not get the full image form scrollview , But only a half , and the half is black
EDIT
Try to add
drawHierarchy(in: self.bounds, afterScreenUpdates: true)
after the line
[scrollView.layer renderInContext: UIGraphicsGetCurrentContext()];
Related
I would like to include the Navigation bar in my tableview screenshot image. The following code works to capture the entire tableview and I have tried other code that captures the Navigation bar but not the entire tableview. Is it possible to do both at the same time?
func screenshot(){
var image = UIImage();
UIGraphicsBeginImageContextWithOptions(CGSize(width:tableView.contentSize.width, height:tableView.contentSize.height),false, 0.0)
let context = UIGraphicsGetCurrentContext()
let previousFrame = tableView.frame
tableView.frame = CGRect(x: tableView.frame.origin.x, y: tableView.frame.origin.y, width: tableView.contentSize.width, height: tableView.contentSize.height)
tableView.layer.render(in: context!)
tableView.frame = previousFrame
image = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil)
}
Take navigation bar and tableview screenshots separately, then merge them.
Objective C:
-(UIImage*)merge:(UIImage*)tvImage with:(UIImage*)navImage {
CGFloat contextHeight = tableView.contentSize.height + self.navigationController.navigationBar.frame.size.height;
CGRect contextFrame = CGRectMake(0, 0, tableView.frame.size.width, contextHeight);
UIGraphicsBeginImageContextWithOptions(contextFrame.size, NO, 0.0);
CGContextRef context = UIGraphicsGetCurrentContext();
UIGraphicsPushContext(context);
//1 draw navigation image in context
[navImage drawInRect:self.navigationController.navigationBar.frame];
//2 draw tableview image in context
CGFloat y = self.navigationController.navigationBar.frame.size.height;
CGFloat h = tableView.contentSize.height;
CGFloat w = tableView.frame.size.width;
[tvImage drawInRect:CGRectMake(0, y, w, h)];
// Clean up and get the new image.
UIGraphicsPopContext();
UIImage *mergeImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return mergeImage;
}
Swift 3:
func merge(tvImage:UIImage, with navImage:UIImage) {
let contextHeight:CGFloat = tableView.contentSize.height + self.navigationController!.navigationBar.frame.size.height;
let contextFrame:CGRect = CGRect(0, 0, tableView.frame.size.width, contextHeight);
UIGraphicsBeginImageContextWithOptions(contextFrame.size, false, 0.0);
let context:CGContext = UIGraphicsGetCurrentContext();
UIGraphicsPushContext(context);
//1 draw navigation image in context
navImage.draw(in: self.navigationController.navigationBar.frame)
//2 draw tableview image in context
let y:CGFloat = self.navigationController.navigationBar.frame.size.height;
let h:CGFloat = tableView.contentSize.height;
let w:CGFloat = tableView.frame.size.width;
tvImage.draw(in: CGRectMake(0, y, w, h))
// Clean up and get the new image.
UIGraphicsPopContext();
let mergeImage:UIImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return mergeImage;
}
Writing an extension will always help us to reuse. I have created a simple UIView extension check below
extension UIView {
// render the view within the view's bounds, then capture it as image
func asImage() -> UIImage {
let renderer = UIGraphicsImageRenderer(bounds: bounds)
return renderer.image(actions: { rendererContext in
layer.render(in: rendererContext.cgContext)
})
}
}
Usage:
self.imageview.image = self.view.asImage() // If you want to capture the View
self.imageview.image = self.tabBarController?.view.asImage() // If it's TabbarViewController
My Swift code for capturing a UITableView as an image isn't working when the table is scrolled down. I essentially have the answer in Objective-C but can't seem to make it work in Swift. Currently this is what I have in Swift:
func snapshotOfCell (inputView: UIView) -> UIView {
UIGraphicsBeginImageContextWithOptions(inputView.bounds.size, false, 0.0)
inputView.layer.renderInContext(UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext() as UIImage
UIGraphicsEndImageContext()
let cellSnapshot : UIView = UIImageView(image: image)
cellSnapshot.layer.masksToBounds = false
return cellSnapshot
}
I found this answer but it's in Objective-C:
-(UIImage *) imageWithTableView:(UITableView *)tableView {
UIView *renderedView = tableView;
CGPoint tableContentOffset = tableView.contentOffset;
UIGraphicsBeginImageContextWithOptions(renderedView.bounds.size, renderedView.opaque, 0.0);
CGContextRef contextRef = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(contextRef, 0, -tableContentOffset.y);
[tableView.layer renderInContext:contextRef];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
It seems to fix the scroll problem by using a contentOffset. However, I've been trying to integrate it into my Swift function without success. Anyone good with both Objective-C and Swift? Thanks!
capture whole tableview as a image
UIGraphicsBeginImageContextWithOptions(CGSizeMake(tableView.contentSize.width, tableView.contentSize.height),false, 0.0)
let context = UIGraphicsGetCurrentContext()
let previousFrame = tableView.frame
tableView.frame = CGRectMake(tableView.frame.origin.x, tableView.frame.origin.y, tableView.contentSize.width, tableView.contentSize.height);
tableView.layer.renderInContext(context!)
tableView.frame = previousFrame
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext();
imageView.image = image;
capture the screenshot of tableview in a scrolled position
let contentOffset = tableView.contentOffset
UIGraphicsBeginImageContextWithOptions(tableView.bounds.size, true, 1)
let context = UIGraphicsGetCurrentContext()
CGContextTranslateCTM(context, 0, -contentOffset.y)
tableView.layer.renderInContext(context!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
imageView.image = image;
Swift 3.0 version for capturing entire tableview based on #Jeyamahesan's answer
UIGraphicsBeginImageContextWithOptions(CGSize(width:tableView.contentSize.width, height:tableView.contentSize.height),false, 0.0)
let context = UIGraphicsGetCurrentContext()
let previousFrame = tableView.frame
tableView.frame = CGRect(x: tableView.frame.origin.x, y: tableView.frame.origin.y, width: tableView.contentSize.width, height: tableView.contentSize.height)
tableView.layer.render(in: context!)
tableView.frame = previousFrame
let image = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
Try this piece of code:
-(UIImage *)screenshot {
UIImage *image = nil;
UIGraphicsBeginImageContextWithOptions(tableView.contentSize, false, 0.0);
{
CGPoint savedContentOffset = tableView.contentOffset;
CGRect savedFrame = tableView.frame;
tableView.contentOffset = CGPointMake(0.0, 0.0);
tableView.frame = CGRectMake(0, 0.0, tableView.contentSize.width, tableView.contentSize.height);
[tableView.layer renderInContext:UIGraphicsGetCurrentContext()];
image = UIGraphicsGetImageFromCurrentImageContext();
tableView.contentOffset = savedContentOffset;
tableView.frame = savedFrame;
}
UIGraphicsEndImageContext();
return image;
}
Happy Coding..!!
Please try this one Its may be help to you
- (UIImage*)buildImage:(UIImage*)image
{
UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
[image drawAtPoint:CGPointZero];
CGFloat scale;
scale = image.size.width / _workingView.frame.size.width;
CGContextScaleCTM(UIGraphicsGetCurrentContext(), scale, scale);
NSLog(#"%f",scale);
[tableView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *tmp = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return tmp;
}
Hi like i said on the title i'm trying to draw a full UIImage inside a square that match the highest size of the UIImage. my question is how can i make my code work. what my code is dowing is cropping to square size. I'm new to IOs can anyOne help.
PS wich methods of CGcontext do i Need to call.
thanks.
- (UIImage*)imageWithBorderFromImage:(UIImage*)source;
{
CGSize size = [source size];
CGFloat width = size.width;
CGFloat height = size.height;
CGSize resizedImageSize;
if (width < height) {
resizedImageSize = CGSizeMake(height, height);
}else {
resizedImageSize = CGSizeMake(width, width);
}
UIGraphicsBeginImageContext(resizedImageSize);
CGRect rect = CGRectMake(0, 0, resizedImageSize.width, resizedImageSize.height);
[source drawInRect:rect blendMode:kCGBlendModeNormal alpha:1.0];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetRGBStrokeColor(context, 1.0, 0.5, 1.0, 1.0);
CGContextStrokeRect(context, rect);
UIImage *testImg = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return testImg;
}
The type of result i'm looking for.
In Swift 3
extension UIImage {
func squareMe() -> UIImage {
var squareImage = self
let maxSize = max(self.size.height, self.size.width)
let squareSize = CGSize(width: maxSize, height: maxSize)
let dx = CGFloat((maxSize - self.size.width) / 2)
let dy = CGFloat((maxSize - self.size.height) / 2)
UIGraphicsBeginImageContext(squareSize)
var rect = CGRect(x: 0, y: 0, width: maxSize, height: maxSize)
if let context = UIGraphicsGetCurrentContext() {
context.setFillColor(UIColor.clear.cgColor)
context.fill(rect)
rect = rect.insetBy(dx: dx, dy: dy)
self.draw(in: rect, blendMode: .normal, alpha: 1.0)
if let img = UIGraphicsGetImageFromCurrentImageContext() {
squareImage = img
}
UIGraphicsEndImageContext()
}
return squareImage
}
}
It looks like you were closer than you realized to achieving your goal. You needed to adjust the rect used when calling drawInRect: to keep the aspect ratio and fit in the middle of the new image's rect. Remember that the rect used there does not dictate the new image's size, the value passed to UIGraphicsBeginImageContext defines that.
- (UIImage *)squareImageFromImage:(UIImage *)image
{
// Get a square that the image will fit into
CGFloat maxSize = MAX(image.size.height, image.size.width);
CGSize squareSize = CGSizeMake(maxSize, maxSize);
// Get our offset to center the image inside our new square frame
CGFloat dx = (maxSize - image.size.width) / 2.0f;
CGFloat dy = (maxSize - image.size.height) / 2.0f;
UIGraphicsBeginImageContext(squareSize);
CGRect rect = CGRectMake(0, 0, maxSize, maxSize);
// Draw a white background and set a magenta stroke around the entire square image (debugging only?)
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [UIColor whiteColor].CGColor);
CGContextSetStrokeColorWithColor(context, [UIColor magentaColor].CGColor);
CGContextFillRect(context, rect);
CGContextStrokeRect(context, rect);
// Adjust the rect to be centered in our new image
rect = CGRectInset(rect, dx, dy);
[image drawInRect:rect blendMode:kCGBlendModeNormal alpha:1.0];
UIImage *squareImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return squareImage;
}
Which takes this sample image
Before Image, Rectangular
and gives you this new square image
Processed Image, Square
How to create a circular image with border (UIGraphics)?
P.S. I need to draw a picture.
code in viewDidLoad:
NSURL *url2 = [NSURL URLWithString:#"http://images.ak.instagram.com/profiles/profile_55758514_75sq_1399309159.jpg"];
NSData *data2 = [NSData dataWithContentsOfURL:url2];
UIImage *profileImg = [UIImage imageWithData:data2];
UIGraphicsEndImageContext();
// Create image context with the size of the background image.
UIGraphicsBeginImageContext(profileImg.size);
[profileImg drawInRect:CGRectMake(0, 0, profileImg.size.width, profileImg.size.height)];
// Get the newly created image.
UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
// Release the context.
UIGraphicsEndImageContext();
// Set the newly created image to the imageView.
self.imageView.image = result;
It sounds like you want to clip the image to a circle. Here's an example:
static UIImage *circularImageWithImage(UIImage *inputImage,
UIColor *borderColor, CGFloat borderWidth)
{
CGRect rect = (CGRect){ .origin=CGPointZero, .size=inputImage.size };
UIGraphicsBeginImageContextWithOptions(rect.size, NO, inputImage.scale); {
// Fill the entire circle with the border color.
[borderColor setFill];
[[UIBezierPath bezierPathWithOvalInRect:rect] fill];
// Clip to the interior of the circle (inside the border).
CGRect interiorBox = CGRectInset(rect, borderWidth, borderWidth);
UIBezierPath *interior = [UIBezierPath bezierPathWithOvalInRect:interiorBox];
[interior addClip];
[inputImage drawInRect:rect];
}
UIImage *outputImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return outputImage;
}
Result:
Have you tried this ?
self.imageView.layer.borderColor = [UIColor greenColor].CGColor;
self.imageView.layer.borderWidth = 1.f;
You'll also need
self.imageView.layer.corderRadius = self.imageView.frame.size.width/2;
self.imageView.clipsToBounds = YES;
Swift 4 version
extension UIImage {
func circularImageWithBorderOf(color: UIColor, diameter: CGFloat, boderWidth:CGFloat) -> UIImage {
let aRect = CGRect.init(x: 0, y: 0, width: diameter, height: diameter)
UIGraphicsBeginImageContextWithOptions(aRect.size, false, self.scale)
color.setFill()
UIBezierPath.init(ovalIn: aRect).fill()
let anInteriorRect = CGRect.init(x: boderWidth, y: boderWidth, width: diameter-2*boderWidth, height: diameter-2*boderWidth)
UIBezierPath.init(ovalIn: anInteriorRect).addClip()
self.draw(in: anInteriorRect)
let anImg = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
return anImg
}
}
I have a game where users can create custom levels and upload them to my server for other users to play and I want to get a screenshot of the "action area" before the user tests his/her level to upload to my server as sort of a "preview image".
I know how to get a screenshot of the entire view, but I want to define it to a custom frame. Consider the following image:
I want to just take a screenshot of the area in red, the "action area." Can I achieve this?
Just you need to make a rect of the area you want to be captured and pass the rect in the method.
Swift 3.x :
extension UIView {
func imageSnapshot() -> UIImage {
return self.imageSnapshotCroppedToFrame(frame: nil)
}
func imageSnapshotCroppedToFrame(frame: CGRect?) -> UIImage {
let scaleFactor = UIScreen.main.scale
UIGraphicsBeginImageContextWithOptions(bounds.size, false, scaleFactor)
self.drawHierarchy(in: bounds, afterScreenUpdates: true)
var image: UIImage = UIGraphicsGetImageFromCurrentImageContext()!
UIGraphicsEndImageContext()
if let frame = frame {
let scaledRect = frame.applying(CGAffineTransform(scaleX: scaleFactor, y: scaleFactor))
if let imageRef = image.cgImage!.cropping(to: scaledRect) {
image = UIImage(cgImage: imageRef)
}
}
return image
}
}
//How to call :
imgview.image = self.view.imageSnapshotCroppedToFrame(frame: CGRect.init(x: 0, y: 0, width: 320, height: 100))
Objective C :
-(UIImage *)captureScreenInRect:(CGRect)captureFrame
{
CALayer *layer;
layer = self.view.layer;
UIGraphicsBeginImageContext(self.view.bounds.size);
CGContextClipToRect (UIGraphicsGetCurrentContext(),captureFrame);
[layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return screenImage;
}
//How to call :
imgView.image = [self captureScreenInRect:CGRectMake(0, 0, 320, 100)];
- (UIImage *) getScreenShot {
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
CGRect rect = [keyWindow bounds];
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[keyWindow.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}