why the image become zoom while converting view to image?

Question

I have uiview and i want to convert that view to image which is working quite well but when i pressed the home button of iphone and run the app again the image become zoom in .Here is my code to converting view to image.

When the app 1st time run

After pressing the home button and run the app again.

- (UIImage *)captureView {
        CGRect rect = [myview bounds];
        UIGraphicsBeginImageContext(rect.size);
        CGContextRef context = UIGraphicsGetCurrentContext();
        [myview.layer renderInContext:context];
        UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
        UIGraphicsEndImageContext();
        return img;

 }
 checkImage.image = [self captureView];

score 1 · Accepted Answer · edited May 23 '17 at 11:50

1

here this code is not wrong but you used some other object instead of whole view . i don't know but try to use that view bounds in which that whole Image display.. See my answer same like your this answer from this bellow link..

how to capture uiview top uiview

Also try with self.view instead of myView in your code.

add this code instead of your checkImage.image = [self captureView]; line..

 UIImageView *imgTempHeader = [[UIImageView alloc]initWithImage:[self captureView]];
 imgTempHeader.frame = self.view.frame;
 [self.view addSubview:imgTempHeader];
 [self.view bringSubviewToFront:imgTempHeader];

edited May 23 '17 at 11:50

Community

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answered Aug 06 '13 at 10:25

Paras Joshi

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myView is another view on main view – iOS developer Aug 06 '13 at 10:31
yes i know but i just want to check that if you use self.view instead of myView in your all code then its get image of whole view or not.. do that and let me know , also use my code instead of your from this link http://stackoverflow.com/questions/14049796/howe-to-capture-uiview-top-uiview/ – Paras Joshi Aug 06 '13 at 10:33
@parash joshi same issue – iOS developer Aug 06 '13 at 10:42
@iOSdeveloper hey i update code with example please try out with that code and let me know... – Paras Joshi Aug 06 '13 at 10:55
@Parash Joshi after pressing the Home Button of iPhone and run the app again it zoom – iOS developer Aug 06 '13 at 11:01
its means your `checkImage` `UIImageView` is set default with some zoomscale with programming or from xib , post code related to `checkImage` please – Paras Joshi Aug 06 '13 at 11:03
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/34899/discussion-between-ios-developer-and-paras-joshi) – iOS developer Aug 06 '13 at 11:06

score 0 · Answer 2 · answered Aug 06 '13 at 10:24

0

You should be creating the context in a way which uses the scale of the device:

UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);

Then when you display the image in the image view ensure that the content mode is set to prevent scaling.

answered Aug 06 '13 at 10:24

Wain

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What is the size of `myview` and `checkImage`? – Wain Aug 06 '13 at 10:30
both having same size – iOS developer Aug 06 '13 at 10:32
Any scroll views? The image generation seems ok, I guess it's something else about your views of the way you configure the image display. – Wain Aug 06 '13 at 10:59
any solution regarding this problem – iOS developer Aug 06 '13 at 12:00
Show all information about your views, superviews, configuration, source image. – Wain Aug 06 '13 at 12:03
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/34902/discussion-between-ios-developer-and-wain) – iOS developer Aug 06 '13 at 12:06

score 0 · Answer 3 · answered Aug 06 '13 at 10:36

My experience is with setting up imageViews in IB. I assume checkImage is an instance of UIImageView?

If you were displaying an image in a UIImageView and had only set the view mode to center in interface builder it would appear zoomed in if the image was large.

Have a look at this way to process your image first:

UIImage *newImage = [[UIImage alloc] initWithCGImage:myCGImageRef scale:myZoomSCale orientation:UIImageOrientationDown];

Of course you will need to give it a CGImageRef for your image. Over to you or somebody else for that.

why the image become zoom while converting view to image?

3 Answers3