I have a transparent image and a UIView below and same size with the image. Everytime I want to change color of the image, I just set color to the UIView. My problem is how can I save the decorated image to the photo library? Since the color/decoration comes from the UIView below, not the image.
Thanks guy for reading.
You can get screen shot of a view by this method:
+ (UIImage *) getScreenShot : (UIView *) view{
UIGraphicsBeginImageContext(view.frame.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return screenImage;
}
Pass your baseView in this method it'll return the decorated image.
Related
I am trying to take a screenshot of my UIImageView and a UILabel that is on top of that.
What I have so far grabs the UIImage in the ImageView and then renders the overlay on it but the positioning of the UILabel is all wrong. I am setting the size of the capture to the actual image size(which isn't what i want).
I just want to be able to take a screenshot exactly how it appears on the screen.
CGSize imageSize = self.imageFromOtherView.size;
// define the size and grab a UIImage from it
UIGraphicsBeginImageContextWithOptions(imageSize, NO, 0);
[self.imageFromOtherView drawInRect:CGRectMake(0, 0, imageSize.width, imageSize.height)];
[self.socialLabel.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *capturedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Create a UIView to hold both the UIImageView and UILabel. Then pass this container view through this code. I have my view as a property called viewForPhoto so when the code is called it only captures that view. You can tweak it so that it receives a view. This will return the UIImage that you want.
- (UIImage *)imageByRenderingView
{
UIGraphicsBeginImageContextWithOptions(self.viewForPhotoView.bounds.size, NO, 0.0);
[self.viewForPhotoView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resultingImage;
}
Add both those views to a common container view, and then call - (BOOL)drawViewHierarchyInRect:(CGRect)rect afterScreenUpdates:(BOOL)afterUpdates on the view to render it in a context.
I have a UIView whose layer has two sublayers, each of which has a 1.5 pixel border around the outside. I am trying to create a UIImage from this view with the following code
UIGraphicsBeginImageContextWithOptions(self.bounds.size, NO, 0.0f);
[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:NO];
UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
The code does return a UIImage, but the image is clipped – that is, the image doesn't include the all of the borders on the sublayers. I've tried tweaking the sizes/bounds but to no effect. Any suggestions of what else I might try?
Thanks!
What happens if you send the parent layer a
drawInContext: message instead of telling the view to draw itself?
I am applying blur to various sections of my app using the UIImage+ImageEffects.h sample code that was provided in one of the apps from the WWDC in 2013. It works well and I'm able to recreate the iOS7 effects for any UIImage.
However, I would like to recreate the effect of the UINavigationBar blurred transparency but using any view that I choose. Similar to the screenshot shown below.
For instance, say that I have a UITableView that takes up half of the screen. I also have a UIImageView background as a separate view behind it that occupies the entire screen. I would only like to blur the UIImageView background for just that section of the screen that's under the tableview.
Here's my question. How do I create create a UIImage by taking a "screenshot" of whatever is behind a UIView that is displayed? Is this even possible?
Here is my screen hierarchy. Nothing complex. I would like the "Blurred Image View" to contain a blurred image of the section of the "Image View" that is sitting as the main UIImageView in the hierarchy.
If you are deploing only on iOS7 you can use the new api, that are a lot faster than -renderInContext and use the ImageEffects category on that image taken from the view. Add this a a category on UIView
#interface UIView (RenderView)
- (UIImage *) imageByRenderingView;
- (UIImage *) imageByRenderingViewOpaque:(BOOL) yesOrNO;
#end
#implementation UIView (RenderView)
- (UIImage *) imageByRenderingViewOpaque:(BOOL) yesOrNO {
UIGraphicsBeginImageContextWithOptions(self.bounds.size, yesOrNO, 0);
if ([self respondsToSelector:#selector(drawViewHierarchyInRect:afterScreenUpdates:)]) {
[self drawViewHierarchyInRect:self.bounds afterScreenUpdates:NO];
}
else {
[self.layer renderInContext:UIGraphicsGetCurrentContext()];
}
UIImage *resultingImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return resultingImage;
}
- (UIImage *) imageByRenderingView{
return [self imageByRenderingViewOpaque:NO];
}
This snippet is a UIView category ok also for system lower than iOS7. It takes an image on a view and its subviews.
Use the below piece of code for iOS < 7
#import <QuartzCore/QuartzCore.h>
+ (UIImage *) imageWithView:(UIView *)view
{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage * img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
I'm trying to make a transition between two ViewControllers. My Transition class has a property for the destination view controller. When I try to get a screenshot of the destination's view, I use this method:
+ (UIImage *)renderImageFromView:(UIView *)view withRect:(CGRect)frame {
// Create a new context the size of the frame
UIGraphicsBeginImageContextWithOptions(frame.size, YES, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
// Render the view
[view.layer renderInContext:context];
// Get the image from the context
UIImage *renderedImage = UIGraphicsGetImageFromCurrentImageContext();
// Cleanup the context you created
UIGraphicsEndImageContext();
return renderedImage;
}
So when I want the image, I'll do this:
UIImage *image = [UIImage renderImageFromView:destinationController.view withRect:destinationController.view.bounds];
I tried it on a blank UIViewController with an orange background color and a label. I get the orange background color, but I do not get the label that was created in IB. Is there a way to get a proper screenshot of the new view I plan on showing? Thanks!
You need to make sure the view's layer is drawn to first. Calling renderInContext on a CALayer will only recursively call additional child CALayers. You need your child UIViews to draw themselves, not just using the CALayer.
Try calling
[view drawrect:frame];
instead of
[view.layer renderInContext:context];
As long as you have an open graphics context(which you do at that point), drawrect should draw directly into that.
I'm creating an app where within a UIView subclass I have several UIImageView's holding UIImage's that the user has picked. I want to be able to allow the user to save the UIView to the PhotoLibrary so that those UIImageView's are saved as a sort of collage within this UIView. Would I need to have a UIImageView in place of the UIView to allow the code to save the whole area? or would I be able to use the UIView?
Thank you in advance!
This function does what you want except storage:
-(UIImage *)takeScreeShotOfView:(UIView *)view
{
UIGraphicsBeginImageContext(CGSizeMake(1024, 748));
CGContextRef context = UIGraphicsGetCurrentContext();
[view.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}