CODEWITHSUNDEEP
iosobjective-c
TigerCoding
TigerCoding

Reputation: 8720

Passing a property object to method expecting NSObject results in pointer error

I have a method in a custom FileIO (Input/Output) class with this definition:

- (void)saveObject:(NSObject*)object;

I have another class named MyClass that has a property:

@property (nonatomic, strong) MyDataClass* myData; // subclassed from NSObject

I try to call the method with the property:

[fileIO saveObject:self.myData];

For some reason, I get a semantic warning:

Incompatible pointer types sending 'MyDataClass *' to parameter of type 'NSObject *'

Upvotes: 0

Views: 51

Answers (1)

rmaddy
rmaddy

Reputation: 318804

Given that MyDataClass does in fact extend NSObject, the issue may arise if this .m file does not import (directly or indirectly) the .h for MyDataClass. If all it has seen is a forward declaration (via @class), the compiler doesn't yet know that MyDataClass extends NSObject.

Import the .h for MyDataClass and it should solve the problem.

Upvotes: 1

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