Capturing full screenshot with status bar in iOS programmatically - objective-c

Question

I am using this code to capture a screenshot and to save it to the photo album.
-(void)TakeScreenshotAndSaveToPhotoAlbum
{
UIWindow *window = [UIApplication sharedApplication].keyWindow;
if ([[UIScreen mainScreen] respondsToSelector:#selector(scale)])
UIGraphicsBeginImageContextWithOptions(window.bounds.size, NO, [UIScreen mainScreen].scale);
else
UIGraphicsBeginImageContext(window.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);
}
But the problem is whenever the screenshot is saved, I see the status bar of iPhone is not captured. Instead a white space appears at the bottom. Like the following image:
What am I doing wrong?

Answer 1

The status bar is actually in its own UIWindow, in your code you are only rendering the view of your viewcontroller which does not include this.
The "official" screenshot method was here but now seems to have been removed by Apple, probably due to it being obsolete.
Under iOS 7 there is now a new method on UIScreen for getting a view holding the contents of the entire screen:
- (UIView *)snapshotViewAfterScreenUpdates:(BOOL)afterUpdates
This will give you a view which you can then manipulate on screen for various visual effects.
If you want to draw the view hierarchy into a context, you need to iterate through the windows of the application ([[UIApplication sharedApplication] windows]) and call this method on each one:
- (BOOL)drawViewHierarchyInRect:(CGRect)rect afterScreenUpdates:(BOOL)afterUpdates
You may be able to combine the two above approaches and take the snapshot view, then use the above method on the snapshot to draw it.

Answer 2

The suggested "official" screenshot method doesn't capture status bar (it is not in the windows list of the application). As tested on iOS 5.
I believe, this is for security reasons, but there is no mention of it in the docs.
I suggest two options:
draw a stub status bar image from resources of your app (optionally update time indicator);
capture only your view, without status bar, or trim image afterwards (image size will differ from standard device resolution); status bar frame is known from corresponding property of application object.

Answer 3

Here is my code to take a screenshot and store it as NSData (inside an IBAction). With the sotred NSData then you can share or email or whatever want to do
CGSize imageSize = [[UIScreen mainScreen] bounds].size;
if (NULL != UIGraphicsBeginImageContextWithOptions)
UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
else
UIGraphicsBeginImageContext(imageSize);
CGContextRef context = UIGraphicsGetCurrentContext();
// Iterate over every window from back to front
for (UIWindow *window in [[UIApplication sharedApplication] windows])
{
if (![window respondsToSelector:#selector(screen)] || [window screen] == [UIScreen mainScreen])
{
// -renderInContext: renders in the coordinate space of the layer,
// so we must first apply the layer's geometry to the graphics context
CGContextSaveGState(context);
// Center the context around the window's anchor point
CGContextTranslateCTM(context, [window center].x, [window center].y);
// Apply the window's transform about the anchor point
CGContextConcatCTM(context, [window transform]);
// Offset by the portion of the bounds left of and above the anchor point
CGContextTranslateCTM(context,
-[window bounds].size.width * [[window layer] anchorPoint].x,
-[window bounds].size.height * [[window layer] anchorPoint].y);
// Render the layer hierarchy to the current context
[[window layer] renderInContext:context];
// Restore the context
CGContextRestoreGState(context);
}
}
// Retrieve the screenshot image
UIImage *imageForEmail = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
NSData *imageDataForEmail = UIImageJPEGRepresentation(imageForEmail, 1.0);

Answer 4

Answer of above question for Objective-C is already write there, here is the Swift version answer of above question.
For Swift 3+
Take screenshot and then use it to display somewhere or to send over web.
extension UIImage {
class var screenShot: UIImage? {
let imageSize = UIScreen.main.bounds.size as CGSize;
UIGraphicsBeginImageContextWithOptions(imageSize, false, 0)
guard let context = UIGraphicsGetCurrentContext() else {return nil}
for obj : AnyObject in UIApplication.shared.windows {
if let window = obj as? UIWindow {
if window.responds(to: #selector(getter: UIWindow.screen)) || window.screen == UIScreen.main {
// so we must first apply the layer's geometry to the graphics context
context.saveGState();
// Center the context around the window's anchor point
context.translateBy(x: window.center.x, y: window.center
.y);
// Apply the window's transform about the anchor point
context.concatenate(window.transform);
// Offset by the portion of the bounds left of and above the anchor point
context.translateBy(x: -window.bounds.size.width * window.layer.anchorPoint.x,
y: -window.bounds.size.height * window.layer.anchorPoint.y);
// Render the layer hierarchy to the current context
window.layer.render(in: context)
// Restore the context
context.restoreGState();
}
}
}
guard let image = UIGraphicsGetImageFromCurrentImageContext() else {return nil}
return image
}
}
Usage of above screenshot
Lets display above screen shot on UIImageView
yourImageView = UIImage.screenShot
Get image Data to save/send over web
if let img = UIImage.screenShot {
if let data = UIImagePNGRepresentation(img) {
//send this data over web or store it anywhere
}
}

Answer 5

Swift, iOS 13:
The code below (and other ways of accessing) will now crash the app with a message:
App called -statusBar or -statusBarWindow on UIApplication: this code must be changed as there's no longer a status bar or status bar window. Use the statusBarManager object on the window scene instead.
The window scenes and statusBarManager's really only give us access to frame - if this is still possible, I am not aware how.
Swift, iOS10-12:
The following works for me, and after profiling all the methods for capturing programmatic screenshots - this is the quickest, and the recommended way from Apple following iOS 10
let screenshotSize = CGSize(width: UIScreen.main.bounds.width * 0.6, height: UIScreen.main.bounds.height * 0.6)
let renderer = UIGraphicsImageRenderer(size: screenshotSize)
let statusBar = UIApplication.shared.value(forKey: "statusBarWindow") as? UIWindow
let screenshot = renderer.image { _ in
UIApplication.shared.keyWindow?.drawHierarchy(in: CGRect(origin: .zero, size: screenshotSize), afterScreenUpdates: true)
statusBar?.drawHierarchy(in: CGRect(origin: .zero, size: screenshotSize), afterScreenUpdates: true)
}
You don't have to scale your screenshot size down (you can use UIScreen.main.bounds directly if you want)

Answer 6

Capture the full screen of iPhone, get the status bar by using KVC:
if let snapView = window.snapshotView(afterScreenUpdates: false) {
if let statusBarSnapView = (UIApplication.shared.value(forKey: "statusBar") as? UIView)?.snapshotView(afterScreenUpdates: false) {
snapView.addSubview(statusBarSnapView)
}
UIGraphicsBeginImageContextWithOptions(snapView.bounds.size, true, 0)
snapView.drawHierarchy(in: snapView.bounds, afterScreenUpdates: true)
let snapImage = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
}

Answer 7

The following works for me, capturing the status bar fine (iOS 9, Swift)
let screen = UIScreen.mainScreen()
let snapshotView = screen.snapshotViewAfterScreenUpdates(true)
UIGraphicsBeginImageContextWithOptions(snapshotView.bounds.size, true, 0)
snapshotView.drawViewHierarchyInRect(snapshotView.bounds, afterScreenUpdates: true)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()