[英]How do I code for different versions of iPhone OS in XCode?
I seem to have a bug because I'm using -[AVAudioSession setActive:withFlags:error:]
in an iPhone project that is for 3.0 - 4.0.2. 我似乎有一个错误,因为我在用于
-[AVAudioSession setActive:withFlags:error:]
的iPhone项目中使用-[AVAudioSession setActive:withFlags:error:]
。 So I guess I need to put one of those #IF lines in, so I can get it to do different things based on the OS version... But I can't find out how to do it. 因此,我想我需要插入其中的#IF行之一,以便可以根据操作系统版本执行不同的操作……但是我不知道该怎么做。
You simply have to check if the method you're trying to call really exists: 您只需要检查您尝试调用的方法是否确实存在:
if ([AVAudioSession respondsToSelector:@selector(setActive:withFlags:error:)]) {
// call it
}
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