NSString & CFStringRef

概述NSString and CFStringRef are "Toll free bridged", meaning that you can simply typecast between them. For example: CFStringRef aCFString = (CFStringRef)aNSString; works perfectly and transparently. Lik

Nsstring and CFStringRef are "Toll free brIDged",meaning that you can simply typecast between them.

For example:

CFStringRef aCFString = (CFStringRef)aNsstring; 

works perfectly and transparently. likewise:

Nsstring *aNsstring = (Nsstring *)aCFString; 

works as well. The key thing to note is that CoreFoundation will often return objects with +1 reference counts,meaning that they need to be released (all CF[Type]Create format functions do this).

The nice thing is that in Cocoa you can safely use autorelease or release to free them up.

总结

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