if iOS 6 [do this] else iOS 5 [do that]? - UIActivityViewController

Question

I've got a UIActivityViewController that shares Text and Image on Facebook/Twitter/Email, but it only works on iOS 6+.. Is it possible to pick up the iOS version running on the device and do an IF Statement to avoid crashing in iOS 5 ? If iOS6, do the following code, else do something else...?

-(void)shareMenu
{
    NSString *textToShare = @"Text that will be shared";
    UIImage *imageToShare = [UIImage imageNamed:@"share_picture.png"];
    NSArray *itemsToShare = [[NSArray alloc] initWithObjects:textToShare, imageToShare, nil];
    UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:itemsToShare applicationActivities:nil];
    activityVC.excludedActivityTypes = [[NSArray alloc] initWithObjects: UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll, UIActivityTypeMessage, UIActivityTypePostToWeibo, nil];
    [self presentViewController:activityVC animated:YES completion:nil];
}

In general (not this specific case) I find it's usually best to use `respondsToSelector` to determine which version of a iOS class I'm dealing with, based on what methods it supports. Among other things this helps to document the specific dependency. — Hot Licks, Aug 24 '13 at 13:57

score 25 · Accepted Answer · answered Dec 05 '12 at 20:47

if( [UIActivityViewController class] ) {
     NSString *textToShare = @"Text that will be shared";
    UIImage *imageToShare = [UIImage imageNamed:@"share_picture.png"];
    NSArray *itemsToShare = [[NSArray alloc] initWithObjects:textToShare, imageToShare, nil];
    UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:itemsToShare applicationActivities:nil];
    activityVC.excludedActivityTypes = [[NSArray alloc] initWithObjects: UIActivityTypePrint, UIActivityTypeCopyToPasteboard, UIActivityTypeAssignToContact, UIActivityTypeSaveToCameraRoll, UIActivityTypeMessage, UIActivityTypePostToWeibo, nil];
    [self presentViewController:activityVC animated:YES completion:nil];
}

Or better use

if( NSClassFromString (@"UIActivityViewController") ) {

}

Read this

This is a better solution than testing to iOS version numbers explicitly. — vcsjones, Dec 05 '12 at 20:48
This works 100% thank you! But how do I hide the **UIBarButtonItem** in my **NavigationBar** when it is not running on iOS6? In iOS5 it is clickable but no function, so I want to hide it please? Thanks for your answer! — emotality, Dec 05 '12 at 21:02

score 4 · Answer 2 · answered Dec 05 '12 at 20:48

4

There are a few ways to do this, but the simplest is probably to test for the existence of this class, e.g.

if ([UIActivityViewController class])
  //iOS 6+
else 
  // < iOS 6

answered Dec 05 '12 at 20:48

wattson12

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score 0 · Answer 3 · answered Dec 05 '12 at 20:48

0

You should consider using [[UIDevice currentDevice] systemVersion] that will return a string for the current operating system. You can easily write a macro to see if version is at least a specified number.

answered Dec 05 '12 at 20:48

Jack

131,802
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4

This is not a good idea. It's much better to check for the existence of the desired class. It's much cleaner and direct than relying on version numbers. – rmaddy Dec 05 '12 at 21:01
There's an advantage to testing for the system version: It documents very clearly when you can actually remove the test again (i.e. when dropping iOS 5 support). – nschum Oct 23 '14 at 07:52

if iOS 6 [do this] else iOS 5 [do that]? - UIActivityViewController

3 Answers3