UIActivityViewController issue iOS 7 and iOS 8? - ios

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;
}

Answer 3

In Swift, You can use '?' instead checking OS version.
AVC.popoverPresentationController?.sourceView = _webView