How does conditionally coding for iPhone and iPad work in reality?

Question

UIImagePicker must be presented differently on iPhone and iPad. On the iPad, it throws an exception saying this:

* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'On iPad, UIImagePickerController must be presented via UIPopoverController'

So I must add code to my universal app which is iPad specific. What is a safe way to do it so that the app won't crash on devices which lack a UIPopoverController?

Example:

popover = [[UIPopoverController alloc] initWithContentViewController:imagePicker];
        [popover presentPopoverFromRect:CGRectMake(100, 100.0, 0.0, 0.0) 
                                 inView:self.view
               permittedArrowDirections:UIPopoverArrowDirectionAny 
                               animated:YES];

Also, in case I need a UIPopoverController, I need an instance variable that holds it. How would I handle this?

score 3 · Accepted Answer · answered May 24 '11 at 16:12

3

You can check to see if a class exists by doing this.

Class popoverClass = (NSClassFromString(@"UIPopoverController"));
if (popoverClass != nil) {
// you're on ipad
} else {
// you're on iphone/ipod touch
}

answered May 24 '11 at 16:12

i300

116
2

score 2 · Answer 2 · edited May 23 '17 at 11:47

2

This question looks like a dup of: Is there a specific Xcode compiler flag that gets set when compiling for iPad?

edited May 23 '17 at 11:47

Community

1
1

answered May 24 '11 at 15:57

Mark Pauley

1,314
11
11

score 2 · Answer 3 · answered May 24 '11 at 16:16

2

You can do a quick check of which device you are on with:

[[UIDevice currentDevice] model];

answered May 24 '11 at 16:16

Dancreek

9,387
1
29
33

1

The `UI_USER_INTERFACE_IDIOM` macro in the UIDevice header is probably a more appropriate test. – Jonah May 24 '11 at 16:49
This is more straight to the point: if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) – Paulo Sep 24 '13 at 08:28

How does conditionally coding for iPhone and iPad work in reality?

3 Answers3