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I noticed some code example in Apple's documentation shows the following style when declaring the property:
@property (nonatomic, getter=isActivated) BOOL activated;
I understand it allows you to specify a certain name for your getter method. I'd like to know what is the reason and advantage to use this style.
Will I be able to use the dot notation to get the value (e.g. BOOL aBool = someObject.isActivated)? Or should I use[someObject isActivated];
to access the property? Thanks!
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C++ "by value" semantics cannot be applied to Objective-C objects, which are only accessible through pointers. An Objective-C declaration cannot be within a C++ template declaration and vice versa. However, Objective-C types (e.g., Classname *) can be used as C++ template parameters.
Stored and computed properties are usually associated with instances of a particular type. However, properties can also be associated with the type itself. Such properties are known as type properties. In addition, you can define property observers to monitor changes in a property’s value, which you can respond to with custom actions.
The default return type is the generic Objective-C type id . Method arguments begin with a name labeling the argument that is part of the method name, followed by a colon followed by the expected argument type in parentheses and the argument name. The label can be omitted.
In Objective-C, all objects are represented as pointers, and static initialization is not allowed. The simplest object is the type that id ( objc_obj *) points to, which only has an isa pointer describing its class. Other types from C, like values and structs, are unchanged because they are not part of the object system.
No, the getter keyword only changes the method name. The idea is that you'll access the property just like a variable:
if (self.activated) { ... }
self.activated = YES;
But when you're sending a message to the object, it's readable code: if ([self isActivated]) { ... }.
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