How do I call a selector from Objective-C code?

These will use objc_msgSend () to invoke the selector on the native object. Note the use of Runtime.GetNSObject () to convert an IntPtr into an appropriately typed NSObject (sub-)type. If you want the method to be callable from Objective-C code, the member must be virtual.

How do I get the type of an object in Objective-C?

Use the NSObject.Handle property to obtain an IntPtr for an Objective-C type instance. There is more than one objc_msgSend function: Use objc_msgSend_stret for selectors that return a struct. On ARM, this includes all return types that are not an enumeration or any of the C built-in types ( char , short, int, long, float, double ).

How to access instance variables directly in Objective-C?

The solution is simple: in Objective-C init and dealloc methods, access instance variables directly instead of going through properties. In non-ARC code, check your property attributes for “retain” or “assign”. Then code your direct access to match.

Why shouldn't you use objc_msgSend() in Objective C?

Q: Why shouldn't you use objc_msgSend() in Objective C?

Why shouldn't you use objc_msgSend () in Objective C? The Objective C Runtime Guide from Apple, states that you should never use objc_msgSend () in your own code, and recommends using methodForSelector: instead. However, it doesn't provide any reason for this. What are the dangers of calling objc_msgSend () in your code?

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The Objective C Runtime Guide from Apple, states that you should never use objc_msgSend() in your own code, and recommends using methodForSelector: instead. However, it doesn't provide any reason for this.

What are the dangers of calling objc_msgSend() in your code?

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