In Swift, you define a structure or class in a single file, and the external interface to that class or structure is automatically made available for other code to use. An instance of a class is traditionally known as an object.
Create Custom Class In Xcode Project Steps. Click Next button to go to next dialog window. Input class name, choose parent class, select Swift or Objective-C in the language drop down list, then click Next button. Choose a folder to save the custom class related files.
The Delegate Pattern in Swift In Swift, a delegate is a controller object with a defined interface that can be used to control or modify the behavior of another object. One example is the UIApplicaitonDelegate in an iOS app.
“self” as an Object in Swift This self is a reference to the current object (“instance”) of a class (or struct), within that class. You can work with self as if it's a variable or object within the class (or struct), that is the class (or struct). It's an essential concept of Object-Oriented Programming (OOP).
A class program is structured as a set of nested programs (see Figure 20-1). The outermost level of the class program contains the data and behavior for the class itself. It can include one or more methods, each of which is a smaller program containing the code for one method.
To generate the class and properties files initially:From the Xcode menu bar, choose Editor > Create NSManagedObject Subclass.Select your data model, then the appropriate entity, and choose where to save the files. Xcode places both a class and a properties file into your project.
A table view is an instance of the UITableView class, which is a subclass of UIScrollView. Table view cells, which are the repeatable rows, or views, shown in the table view. A table view cell is an instance of a UITableViewCell class, and that class is often subclassed to create custom table view cells.
A data source is almost identical to a delegate. The difference is in the relationship with the delegating object. Instead of being delegated control of the user interface, a data source is delegated control of data.
a delegate is basically the reaction of an event on an object and saying ".delegate=self" means those protocols have been adopted in self ... for eg..
A metatype type refers to the type of any type, including class types, structure types, enumeration types, and protocol types. The metatype of a class, structure, or enumeration type is the name of that type followed by .
In Swift, you can define type-level methods for all classes, structures, and enumerations....Here's how you call a type method on a class called SomeClass :class SomeClass {class func someTypeMethod() {// type method implementation goes here.}}SomeClass. someTypeMethod()
When used with a capital S, Self refers to the type that conform to the protocol, e.g. String or Int . When used with a lowercase S, self refers to the value inside that type, e.g. “hello” or 556.