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[actionMap setObject:@selector(actionNavPop) forKey:@"navPop"];
This doesn't work. NSDictionary can only hold objects, and a SEL type is not an object.
For number types you can do [NSNumber numberWithInt:123] but is there any sort of similar object wrapper for selectors?
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Creating NSDictionary Objects Using Dictionary Literals In addition to the provided initializers, such as init(objects:forKeys:) , you can create an NSDictionary object using a dictionary literal. In Objective-C, the compiler generates code that makes an underlying call to the init(objects:forKeys:count:) method.
An NSDictionary will retain it's objects, and copy it's keys. Here are some effects this has had on code I've worked on. Sometimes you get the same object you put in, sometimes not. Immutable objects are optimized to return themselves as a copy .
[myDictionary setObject:nextValue forKey:myWord]; You can simply say: myDictionary[myWord] = nextValue; Similarly, to get a value, you can use myDictionary[key] to get the value (or nil).
“id” is a data type of object identifiers in Objective-C, which can be use for an object of any type no matter what class does it have. “id” is the final supertype of all objects.
Use NSStringFromSelector() and NSSelectorFromString().
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