将 CFDictionaryRef 转换为 NSDictionary? [英] Casting a CFDictionaryRef to NSDictionary?
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问题描述
我有代码(精简):
CFDictionaryRef *currentListingRef;
//declare currentListingRef here
NSDictionary *currentListing;
currentListing = (NSDictionary *) currentListingRef;
然后我得到错误:
非Objective-C指针类型'CFDictionaryRef *'(又名'constARC 不允许使用 struct __CFDictionary **') 到 'NSDictionary *'
Cast of a non-Objective-C pointer type 'CFDictionaryRef *' (aka 'const struct __CFDictionary **') to 'NSDictionary *' is disallowed with ARC
我做错了什么?如何从 CFDictionaryRef 转换为 NSDictionary?
What am I doing wrong? How do I convert from a CFDictionaryRef to an NSDictionary?
推荐答案
ARC 改变了桥接的工作方式.
ARC changed the way bridging works.
NSDictionary *original = [NSDictionary dictionaryWithObject:@"World" forKey:@"Hello"];
CFDictionaryRef dict = (__bridge CFDictionaryRef)original;
NSDictionary *andBack = (__bridge NSDictionary*)dict;
NSLog(@"%@", andBack);
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