how to take a screenshot with bitmap on iOS

Question

I have a feature, I want to take a screenshot of a UIView(called "arrangeView" in my codes). and send the picture to my server, and then I will print it, so I want a high quantity picture..

My codes:

 UIGraphicsBeginImageContext(arrangeView.frame.size);
    [arrangeView.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    //save and send method
    [self saveImage:newImage WithName:imgTitle];

With these codes I have 2 issues:

the picture quality is too low. because after I uploaded to the server, I will print it. but the picture I got with the codes only 20~40k, it is too small to print.
one friend told me that the app store don't alow app take a screenshot and send it to the server. he told me to use bitmap.

And I searched in google, I don't find a good solution for it. Would someone help?

Thank you very much.

my saveImage method just upload the newImage to the server. What I want to ask just how to get a high quality "newImage" — yang wang, Jun 10 '15 at 09:09

score 1 · Answer 1 · answered Jun 08 '15 at 09:51

1

Screen shot you get will be of same resolution as you main screen size i.e If it is iPhone 5s it will be 640 x 1136. Best way to get screen shot is:

UIView *screenShotView = [arrangeView snapshotViewAfterScreenUpdates:YES];

answered Jun 08 '15 at 09:51

sschunara

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score -1 · Answer 2 · answered Jun 08 '15 at 09:49

-1

Please try to use the code below.you may save first in photo album and then you can send to server

UIView* captureView = self.view;

/* Capture the screen shoot at native resolution */
UIGraphicsBeginImageContextWithOptions(captureView.bounds.size, captureView.opaque, 0.0);
[captureView.layer renderInContext:UIGraphicsGetCurrentContext()];
  UIImage * screenshot = UIGraphicsGetImageFromCurrentImageContext();
 UIGraphicsEndImageContext();

 /* Render the screen shot at custom resolution */
    CGRect cropRect = CGRectMake(0 ,0 ,1435 ,1435);
    UIGraphicsBeginImageContextWithOptions(cropRect.size, captureView.opaque, 1.0f);
  [screenshot drawInRect:cropRect];
    UIImage * customScreenShot = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

  /* Save to the photo album */
   UIImageWriteToSavedPhotosAlbum(customScreenShot , nil, nil, nil);

answered Jun 08 '15 at 09:49

senthilM

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Thanks JeffWood, but I don't know is it allowed by APPLE. – yang wang Jun 08 '15 at 09:55
I did not handle private API.so Apple will allow. – senthilM Jun 08 '15 at 09:57
1

Hi JeffWood, I tried your method, the picture just get a larger size, not get a good clarity, when I zoom it, it become blurry. – yang wang Jun 09 '15 at 00:19
you should alter the method- CGRect cropRect = CGRectMake(0 ,0 ,1435 ,1435); inwhich you have to mention resolution of iphone. – senthilM Jun 09 '15 at 05:16

how to take a screenshot with bitmap on iOS

2 Answers2