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--- ios-labs-s14:basics-methods [2014/02/17 11:22]
mbarboi
+++ ios-labs-s14:basics-methods [2014/02/26 13:02] (current)
mbarboi
@@ Line 2: / Line 2: @@
 “Method”, “message”, and “function” all (sort of) refer to the same thing in Objective-C.
-A method is a section of code that we can call from elsewhere in our code.
+A method is a section of code that we can execute (call) from elsewhere in our code.
 Components to methods:
@@ Line 26: / Line 26: @@
 **Definition**- writing the code that executes/is contained within the method. Known as the method body.
+Methods are defined in **implementation** files, or //.m// files. The form is the same as the declaration, except with curly braces instead of a semicolon which contain the method body.
-Defining a Method
+  *- (RETURNTYPE) METHODNAME:(ARGUMENTTYPE*)ARGUEMENTNAME METHODNAME2:(ARGUMENTTYPE*)ARGUEMENTNAME2 {CODE}
-Return Type: A method may return a value. The return_type is the data type of the value the function returns. Some methods perform the desired operations without returning a value. In this case, the return_type is the keyword void.
-Method Name: This is the actual name of the method. The method name and the parameter list together constitute the method signature.
+====Invocation===
+**Invocation**- the act of running the code contained within a method. A method is invoked on a target, where the target is the object that owns the method.
-Arguments: A argument is like a placeholder. When a function is invoked, you pass a value to the argument. This value is referred to as actual parameter or argument. The parameter list refers to the type, order, and number of the arguments of a method. Arguments are optional; that is, a method may contain no argument.
+Consists of two parts
+  -Target- the target object or class that owns the method; where the method will be invoked
+  -Name- the name of the method to be invoked
-Joining Argument: A joining argument is to make it easier to read and to make it clear while calling it.
+Invoking a method takes the form:
+  [TARGET NAME];
+and can be nested infinitely deep:
+  [[[TARGET NAME] NAME2] NAME3];
-Method Body: The method body contains a collection of statements that define what the method does.
+where NAME2 and NAME3 are methods called on the objects returned by methods NAME and NAME2, respectively.
-Declaration
-Method declaration is required when you define a method in one source file and you call that method in another file. In such case you should declare the function at the top of the file calling the function.

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