How to take screenshot of a selected frame in UIView and set it as a UIImage?
I Also tried this
UIGraphicsBeginImageContext(CGSizeMake(width,height));
CGContextRef context = UIGraphicsGetCurrentContext();
[imageview.layer renderInContext:context];
UIImage *screenShot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
you can do like this
CGRect rect = [captureView bounds];
UIGraphicsBeginImageContextWithOptions(rect.size,YES,0.0f);
CGContextRef context = UIGraphicsGetCurrentContext();
[captureView.layer renderInContext:context];
UIImage *capturedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext()
Related
iam doing one application.In that Im using one imageview with image and add one view with sone clear holes.Means through that holes we can see the background image.So my problem is i want to capture that total screen (imageview with this holes view).Iam using below code but it's not working.
- (UIImage*)captureView:(UIView *)yourView {
CGRect rect = [[UIScreen mainScreen] bounds];
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[yourView.layer renderInContext:context];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
but it's not working.
This IS how we do:
UIGraphicsBeginImageContextWithOptions(yourView.bounds.size, yourView.opaque, 0.0);
[yourView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *LastImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Try this to take your screeShoT
-(UIImage*)getScreenShot
{
CGSize screenSize = [[UIScreen mainScreen] applicationFrame].size;
//CGSize screenSize = CGSizeMake(1024, 768);
CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate(nil, screenSize.width, 416, 8, 4*(int)screenSize.width, colorSpaceRef, kCGImageAlphaPremultipliedLast);
CGContextTranslateCTM(ctx, 0.0, screenSize.height);
CGContextScaleCTM(ctx, 1.0, -1.0);
[(CALayer*)self.yourView.layer renderInContext:ctx];
CGImageRef cgImage = CGBitmapContextCreateImage(ctx);
UIImage *image = [UIImage imageWithCGImage:cgImage];
CGImageRelease(cgImage);
CGContextRelease(ctx);
return image;
}
I need to export UITableViewCell into an image PNG or anything so I can send it as a print screen image embedded in email body using the MFMailComposerViewController.
Use these methods. Just call UIImage *image = [cell screenshot];
- (UIImage *)screenshot
{
return [self screenshotForRect:self.bounds];
}
- (UIImage *)screenshotForRect:(CGRect) rect
{
UIGraphicsBeginImageContext(rect.size);
[[UIColor clearColor] setFill];
[[UIBezierPath bezierPathWithRect:rect] fill];
CGContextRef ctx = UIGraphicsGetCurrentContext();
[self.layer renderInContext:ctx];
UIImage *anImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return anImage;
}
- (UIImage *)captureCell {
//hide controls if needed
CGRect rect = [yourTableCell bounds];
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[yourTableCell.layer renderInContext:context];
UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return img;
}
try something like that:
UIGraphicsBeginImageContext(yourTableViewCellView.bounds.size);
[yourTableViewCellView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
and then you can save the image to data :)
I am using following code to make a screen shot
UIGraphicsBeginImageContext(self.view.frame.size);
blendMode:kCGBlendModeClear alpha:1.0];
[self.view.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);
return viewImage;
It is working fine but it returns the full screen, and I want a screen shot of a particular Frame, like ( 100,100,200,200), I tried to make changes in:
UIGraphicsBeginImageContext(self.view.frame.size);
But no success.
Try this:
float x = 100;
float y = 100;
CGSize size = CGSizeMake(200,200);
UIGraphicsBeginImageContext(size);
CGContextRef c = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(c, -x, -y);
[view.layer renderInContext:c];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
just use three line of code.
UIGraphicsBeginImageContext(CGSizeMake(320, 480));
[self.window.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *frame= UIGraphicsGetImageFromCurrentImageContext();
CGContextRef context = ??; // get from UIImage *oldImage
CGContextSaveGState(context);
CGRect drawRect = CGRectMake(0, 0, 320, 480);
CGContextConcatCTM(context, transform);
UIImage *newImage = [[UIImage alloc] init];
CGContextDrawImage(context, drawRect, newImage.CGImage);
[newImage drawInRect:CGRectMake(0, 0, 320, 480)];
CGContextRestoreGState(context);
In short, what I want to do is [ UIImage -> make some transform -> transformed UIImage].
Any ideas? Big thanks!!
I think what you need is this:
UIGraphicsBeginImageContextWithOptions(newImageSize, YES, 0);
CGContextRef context = UIGraphicsGetCurrentContext();
// drawing commands go here
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Note that UIGraphicsGetImageFromCurrentImageContext() returns an autoreleased UIImage instance.
Here's the code I have but it's crashing ... any ideas?
UIImage *tempImage = [[UIImage alloc] initWithData:imageData];
CGImageRef imgRef = [tempImage CGImage];
[tempImage release];
CGFloat width = CGImageGetWidth(imgRef);
CGFloat height = CGImageGetHeight(imgRef);
CGRect bounds = CGRectMake(0, 0, width, height);
CGSize size = bounds.size;
CGAffineTransform transform = CGAffineTransformMakeScale(4.0, 4.0);
UIGraphicsBeginImageContext(size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextConcatCTM(context, transform);
CGContextDrawImage(context, bounds, imgRef);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
What am I missing here? Basically just trying to scale image up and crop it to be same size as original.
Thanks
The problem is this line:
CGImageRef imgRef = [tempImage CGImage];
Or more precise, the direct follow-up of this line:
[tempImage release];
You are getting a CF object here, the CGImageRef. Core Foundation object only have the retain/release memory management, but no autoreleased objects. Hence, when you release the UIImage in the second row, the CGImageRef will be deleted as well. And this again means that it's undefined when you try to draw it down there.
I can think of three fixes:
use autorelease to delay the release of the image: [tempImage autorelease];
move the release to the very bottom of your method
retain and release the image using CFRetain and CFRelease.
Try this one:
-(CGImageRef)imageCapture
{
UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
CGRect rect= CGRectMake(0,0 ,320, 480);
CGImageRef imageRef = CGImageCreateWithImageInRect([viewImage CGImage], rect);
return imageRef;
}
use the below line whenever you want to capture the screen
UIImage *captureImg=[[UIImage alloc] initWithCGImage:[self imageCapture]];