CODEWITHSUNDEEP
objective-cios4ios5
user1082125
user1082125

Reputation: 1

Upgrading app from IOS4 to IOS5

I have an IOS5 app which uses following function 

[self.presentingViewController dismissModalViewControllerAnimated:YES];

and who works perfectly on IOS4 but suddenly I discovered that this function doesn't exists on IOS5 so I had to use this other equivalent one 

[self.parentViewController dismissModalViewControllerAnimated:YES]

Now I've got the following issue: IOS4 users are not able to install my app due to this non existing function in IOS4 and what is even worse, the app is available on Apple's App Store but is only functional of IOS5 users. Another related issue us that the app suddenly stopped working on iPads equipped with Wifi, those connected to 3G networks operate normal.

Is there anything I missed trying to compile this new app version?

Thanks in advance!

Upvotes: 0

Views: 528

Answers (4)

Tanin
Tanin

Reputation: 1933

I have built a category that add presentingViewController on iOS 4. (It disables itself on iOS 5.)

It works seamlessly; Just include 2 files.

Please see backward-modal.

I hope this benefits you as much as it does to me; It makes your code more clean!

Upvotes: 0

sergio
sergio

Reputation: 69027

The way to go is twofold:

  1. compiling your app against the latest SDK version, but also set the deployment target to the oldest version that you want to support; this will ensure that the app is listed properly in the App Store;

  2. checking before using any method/feature that is only available on a later version; this will ensure that you app will not crash and can be done by means of conditional compilation, e.g.:

k

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 40000
if ([[UIApplication sharedApplication] respondsToSelector:@selector(beginBackgroundTaskWithExpirationHandler:)])
{
    UIBackgroundTaskIdentifier bgTask = [[UIApplication sharedApplication] eginBackgroundTaskWithExpirationHandler:^{}];

     // Perform work that should be allowed to continue in background

     [[UIApplication sharedApplication] endBackgroundTask:bgTask];
}
#endif

this is quite convoluted if you have to do it in many places. You may have a look at this very good post to learn how to improve upon that example.

Upvotes: 0

Daniel
Daniel

Reputation: 31579

You can check for existence of the property like this:

if([self respondsToSelector:@selector(presentingViewController)])
    [self.presentingViewController dismissModalViewControllerAnimated:YES];
else
    [self.parentViewController dismissModalViewControllerAnimated:YES];

Upvotes: 4

Mark Granoff
Mark Granoff

Reputation: 16938

Code it this way:

if ([self respondsToSelector:@selector(parentViewController)])
    [self.parentViewController ...];
else
    [self.presentingViewController ...];

(This is uncompiled, untested, etc.)

The point is that you can (and should) test for capabilities, and then act accordingly. In this case, if the iOS5 method is available, use that one. If not, use the old one, which also means its a pre-iOS5 device.

Upvotes: 1

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