Apple Interview Question for Software Engineer / Developers


Country: United States




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Dynamic binding moves the message-method connection to runtime, as opposed to compile time (see v_table in C). Languages having this feature (e.g. Objective-C) permit the sending of a message to an object that may not respond. While it brings flexibility on development, often causes crashes in runtime. At best you see "warning: 'MyClass' may not respond to -foo" in the compiler output.

- Ozan Eren Bilgen October 19, 2012 | Flag Reply
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You can also call

[className respondsToSelector:(SEL)]

so that you don't get a crash.

- Anonymous July 27, 2013 | Flag Reply
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Dynamic binding is determining the method to invoke at runtime instead of at compile time. Dynamic binding is also referred to as late binding. In Objective-C
code executed is determined by both the method name (the selector) and the receiving object.
[myObject myMethodWithArg:a andArg:b ];
like

objc_msgSend(myObject, "myMethodWithArg:andArg:", a, b);

- Sport January 15, 2014 | Flag


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