UIActivityViewController issue iOS 7 and iOS 8?

Question

I’m building an article reading app for iPad. I have integrated a social sharing functionality which means user can share articles on Facebook, and google mail. I’m using UIActivityViewController for sharing.

There is a bar button item,when user click on that UIActivityViewController opens.I updated Xcode 6 When I run on simulator it runs fine But I run on real device(iPad) with iOS 7,the app get crash on clicking on bar button item. this is my code:

     - (IBAction)ysshareAction:(id)sender
       {

         NSURL *linkURL = [NSURL URLWithString:_DetailModal1[4]];//article url
         NSMutableAttributedString *stringText = [[NSMutableAttributedString alloc]  initWithString:_DetailModal1[0]];//_DetailModal1[0] contain article title////
        [stringText addAttribute:NSLinkAttributeName value:linkURL range:NSMakeRange(0, stringText.length)];
        NSArray * itemsArray = @[[NSString stringWithFormat:@"%@",_DetailModal1[0]], [NSURL URLWithString:_DetailModal1[4]]];
        NSArray * applicationActivities = nil;
        UIActivityViewController * AVC = [[UIActivityViewController alloc] initWithActivityItems:itemsArray applicationActivities:applicationActivities];
        AVC.popoverPresentationController.sourceView = _webView;
        [self presentViewController:AVC animated:YES completion:nil];
        [AVC setCompletionHandler:^(NSString *act, BOOL done)
        {

        if([act isEqualToString:UIActivityTypeMail]) {
         ServiceMsg = @"Mail sent!";
     } else if([act isEqualToString:UIActivityTypePostToTwitter]) {
         ServiceMsg = @"Article Shared!";
     } else if([act isEqualToString:UIActivityTypePostToFacebook]) {
         ServiceMsg = @"Article Shared!";
     } else if([act isEqualToString:UIActivityTypeMessage]) {
         ServiceMsg = @"SMS sent!";
     } else if([act isEqualToString:UIActivityTypeAddToReadingList]) {
         ServiceMsg = @"Added to Reading List";
     } else if([act isEqualToString:UIActivityTypeCopyToPasteboard]){
         ServiceMsg = @"Copied Link";
     }

     if ( done )
     {
         UIAlertView *Alert = [[UIAlertView alloc] initWithTitle:ServiceMsg message:@"" delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil];
         [Alert show];

          }
       }];

    }

Help is appreciated!

Answer 1

Following line is the issue

AVC.popoverPresentationController.sourceView = _webView;

You will have to put iOS8 condition in order popoverPresentationController is introduced for iOS 8 and later so you can not use it with iOS 7

For checking for iOS8 you can define a macro like found from here

#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)

And use it in following way.

     NSURL *linkURL = [NSURL URLWithString:_DetailModal1[4]];//article url
     NSMutableAttributedString *stringText = [[NSMutableAttributedString alloc]  initWithString:_DetailModal1[0]];//_DetailModal1[0] contain article title////
    [stringText addAttribute:NSLinkAttributeName value:linkURL range:NSMakeRange(0, stringText.length)];
    NSArray * itemsArray = @[[NSString stringWithFormat:@"%@",_DetailModal1[0]], [NSURL URLWithString:_DetailModal1[4]]];
    NSArray * applicationActivities = nil;
    UIActivityViewController * AVC = [[UIActivityViewController alloc] initWithActivityItems:itemsArray applicationActivities:applicationActivities];

   if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")){

        AVC.popoverPresentationController.sourceView = _webView;
   }
   [self presentViewController:AVC animated:YES completion:nil];

Refer this for more info about what has changed for UIActivityViewController in iOS8

Answer 2

A lot might argue that checking for existence of the class explicitly is better than checking a hard coded version number. UIPopoverPresentationController may be deprecated at some future point, or there might be a (future ?) device which does not support the class, like the iPhone never used to support UIPopoverController or UISplitViewController..

if (  NSClassFromString(@"UIPopoverPresentationController")   ) {

AVC.popoverPresentationController.sourceView = _webView;


}