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在NSDictionary中複製密鑰後,我得到一個崩潰。我正在使用ARC。是什麼原因?NSDictionary mutableCopy引發exc_bad_access
-(NSArray*) findClosestPointsAroundPoint: (NSDictionary*) p inTable: (NSString*) table {
NSMutableArray* fields = [[p allKeys] mutableCopy];}
(gdb) po table
0xef7b880 does not appear to point to a valid object.