CODEWITHSUNDEEP
iphoneiphone-sdk-3.0
user198725878
user198725878

Reputation: 6386

UIGraphicsBeginImageContext with parameters

I am taking a screenshot in my application. I am able to take the screenshot.

Now I want to take the screenshot by specifying the x and y coordinate. Is that possible?

UIGraphicsBeginImageContext( self.view.bounds.size );
[self.view.layer renderInContext:UIGraphicsGetCurrentContext(  )];
UIImage* aImage = UIGraphicsGetImageFromCurrentImageContext(  );

Upvotes: 13

Views: 19170

Answers (5)

Ahmed Safadi
Ahmed Safadi

Reputation: 453

swift version

    UIGraphicsBeginImageContext(self.view.bounds.size)
    let image: CGContextRef = UIGraphicsGetCurrentContext()!
    CGContextTranslateCTM(image, 0, -40)
    // <-- shift everything up by 40px when drawing.
    self.view.layer.renderInContext(image)
    let viewImage: UIImage = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil)

Upvotes: 0

bpolat
bpolat

Reputation: 3908

Here is Swift version

//Capture Screen
func capture()->UIImage {

    UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, false, UIScreen.mainScreen().scale)
    self.view.layer.renderInContext(UIGraphicsGetCurrentContext()!)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image

}

Upvotes: 0

Saren Inden
Saren Inden

Reputation: 3660

Just do something like this, way easier than all those complex calculations

+ (UIImage *)imageWithView:(UIView *)view {
    UIGraphicsBeginImageContextWithOptions([view bounds].size, NO, [[UIScreen mainScreen] scale]);

    [[view layer] renderInContext:UIGraphicsGetCurrentContext()];

    UIImage *result = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return result;
}

Upvotes: 0

whyoz
whyoz

Reputation: 5246

If you're using a newer retina display device, your code should factor in the resolution by using UIGraphicsBeginImageContextWithOptions instead of UIGraphicsBeginImageContext:

UIGraphicsBeginImageContextWithOptions(self.view.bounds.size,YES,2.0);
CGContextRef c = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(c, 0, -40);    // <-- shift everything up by 40px when drawing.
[self.view.layer renderInContext:c];
UIImage* viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

This will render the retina display image context.

Upvotes: 2

kennytm
kennytm

Reputation: 523764

UIGraphicsBeginImageContext(self.view.bounds.size);
CGContextRef c = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(c, 0, -40);    // <-- shift everything up by 40px when drawing.
[self.view.layer renderInContext:c];
UIImage* viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Upvotes: 19

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