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iphone - running sdk 4.0.1 on Iphone 3.1

Answer 1

+1 A:

MPMoviePlayerLoadStateDidChangeNotification doesn't exist on iOS 3.1.3. You need to detect its presence via weak linking:

if (&MPMoviePlayerLoadStateDidChangeNotification != NULL) {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePreloadDidFinish:) name:MPMoviePlayerLoadStateDidChangeNotification object:m_player];
}

Prior to iOS 3.2 you can use MPMoviePlayerContentPreloadDidFinishNotification to detect when the movie has finished preloading. That symbol may generate a deprecation warning if you are linking against a newer SDK (as you are if you're using MPMoviePlayerLoadStateDidChangeNotification.)

Note the syntax of the symbol check: you must compare against NULL rather than simply using the pointer as the boolean (i.e. if (MPMoviePlayerLoadStateDidChangeNotification) or if (&MPMoviePlayerLoadStateDidChangeNotification).) The compiler and dynamic loader are not able to detect and properly handle those forms, and will crash on 3.1.3 if they are detected.

Jonathan Grynspan 2010-08-02 10:08:12

As a slight clarification, what you describe here is how to detect the presence of a method. He will still need to weak link by finding the application target in Xcode, inspecting it, and going to the General tab. At the bottom of that tab should be a list of frameworks, with a column for Type. Change the Type for MediaPlayer from Required to Weak.

Brad Larson 2010-08-02 20:21:22

You shouldn't need to switch the type of the framework, as it has been included since iOS 2.0.

Jonathan Grynspan 2010-08-03 03:33:48

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iphone - running sdk 4.0.1 on Iphone 3.1

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