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POHow do I reference iOS 4.0 only enums in a project with a deployment target < 4.0?
 

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  1. POHow do I reference iOS 4.0 only enums in a project with a deployment target < 4.0?
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    <p>I am attempting to write an app for iOS that will take advantage of iOS 4.0 features, but also work on an earlier version of the OS (3.1.3). I have set the deployment target to 3.1.3 and the Base SDK to 4.3 (latest)</p> <p>Specifically, I am trying to take advantage of the ability to intercept commands from the remote control.</p> <p>The document linked below is very useful in explaining how to (at run-time) check for the presence of classes and methods, but I still get a compiler error when attempting to reference an enum from the UIEvent class which only appears in iOS 4.0 and later.</p> <p><a href="http://developer.apple.com/library/mac/#documentation/DeveloperTools/Conceptual/cross_development/Using/using.html#//apple_ref/doc/uid/20002000-SW3" rel="nofollow">http://developer.apple.com/library/mac/#documentation/DeveloperTools/Conceptual/cross_development/Using/using.html#//apple_ref/doc/uid/20002000-SW3</a></p> <p>Here is the section of code which causes the compilation to fail:</p> <pre><code>- (void)remoteControlReceivedWithEvent:(UIEvent *)receivedEvent { if (receivedEvent.type == UIEventTypeRemoteControl) { switch (receivedEvent.subtype) { case UIEventSubtypeRemoteControlTogglePlayPause: [self playPauseAction:nil]; break; case UIEventSubtypeRemoteControlPreviousTrack: [self previousChapter:nil]; break; case UIEventSubtypeRemoteControlNextTrack: [self nextChapter:nil]; break; default: break; } } } </code></pre> <p>The compiler complains that:</p> <pre><code>error: 'UIEventTypeRemoteControl' undeclared (first use in this function) </code></pre> <p>UIEventTypeRemoteControl is an enum that isn't defined until 4.0 (from UIEvent.h)</p> <pre><code>typedef enum { UIEventTypeTouches, UIEventTypeMotion, UIEventTypeRemoteControl, } UIEventType; typedef enum { // available in iPhone OS 3.0 UIEventSubtypeNone = 0, // for UIEventTypeMotion, available in iPhone OS 3.0 UIEventSubtypeMotionShake = 1, // for UIEventTypeRemoteControl, available in iOS 4.0 UIEventSubtypeRemoteControlPlay = 100, UIEventSubtypeRemoteControlPause = 101, UIEventSubtypeRemoteControlStop = 102, UIEventSubtypeRemoteControlTogglePlayPause = 103, UIEventSubtypeRemoteControlNextTrack = 104, UIEventSubtypeRemoteControlPreviousTrack = 105, UIEventSubtypeRemoteControlBeginSeekingBackward = 106, UIEventSubtypeRemoteControlEndSeekingBackward = 107, UIEventSubtypeRemoteControlBeginSeekingForward = 108, UIEventSubtypeRemoteControlEndSeekingForward = 109, } UIEventSubtype; </code></pre> <p>So how do I stop the compiler complaining about it?</p> <p>Also - how do i stop the compiler warnings that someClass may not respond to someMethod (where I check at runtime if that class does actually respond to the method, before calling it.) I suppose I could turn off that warning in the compiler settings - but it's a useful warning in other cases.</p> <p>Thanks</p>
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    1. USDiggory
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    1. CO(Answering my own question) - I've just realised that I can solve this issue by re-defining the symbols in my own code - or just use the values that they refer to instead of referencing the symbols themselves.
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      1. POHow do I reference iOS 4.0 only enums in a project with a deployment target < 4.0?
      1. USDiggory
    2. COHmm - maybe not - I can use the numeric values instead of the UIEventSubtypeRemote.... items but I can't work out how to make the line `if (receivedEvent.type == UIEventTypeRemoteControl) {` work.
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      1. POHow do I reference iOS 4.0 only enums in a project with a deployment target < 4.0?
      1. USDiggory
    3. COI cannot reproduce the problem with a new project created with the "View-based application" template. I changed the deployment target to 3.1.3 and added a UIView subclass to this project, then added an override for the remoteControlReceivedWithEvent: method with the code you provided. It compiles fine. So there may be something else in your project configuration that is messing things up...
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      1. POHow do I reference iOS 4.0 only enums in a project with a deployment target < 4.0?
      1. USPascal Bourque
 

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