iphone问题实时总结

CFString is “toll-free bridged” with its Cocoa Foundation counterpart, NSString. This means that the Core Foundation type is interchangeable in function or method calls with the bridged Foundation object. Therefore, in a method where you see an NSString * parameter, you can pass in a CFStringRef, and in a function where you see a CFStringRef parameter, you can pass in an NSString instance. This also applies to concrete subclasses of NSString. See “Interchangeable Data Types” for more information on toll-free bridging.

翻译：CFString是Cocoa 基础的NSString之间的“免费桥”。这意味着，在 Core Foundation类型和he bridged Foundation object的函数或方法可相互调用与。因此，在一个方法，你看到的NSString *参数，你可以传递一个CFStringRef，在一个函数，你看到一个CFStringRef参数，你可以传递一个的NSString实例。这也适用于具体的NSString子类。见“interchangeable Data Types”更多关于免费衔接的信息。

ns****与cf****ref相互兼容 

2.如何获得boundle中的文件

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