this app was developed and works fine under ios 5.0, but crashes under ios 4.3

Question

I developed an iPhone app under iOS 5.0, and it works fine. But when it comes to iOS 4.3(Base SDK = latest iOS 5.0, compiler = Apple LLVM 3.0, Deployment Target = iOS 4.3),

Answer 1

The AVAudioSession method

- (BOOL)setMode:(NSString *)theMode error:(NSError **)outError

Is marked in the documentation as being available only for iOS 5 and later. In fact given the recent addition of modes to the documentation, it looks like audio session modes are not available at all prior to iOS 5.