What is synthesize in Objective-C?

By default, @synthesize generates a member variable with the same name as the target of the set/get. Important: If you use @synthesize without specifying an instance variable name, like this: @synthesize firstName; the instance variable will bear the same name as the property.

What does @property mean in Objective-C?

@property offers a way to define the information that a class is intended to encapsulate. If you declare an object/variable using @property, then that object/variable will be accessible to other classes importing its class. By default, compiler will synthesize accessor methods for this object.

What is dynamic in Objective-C?

Dynamic dispatch. It simply means that the Objective-C runtime decides at runtime which implementation of a particular method or function it needs to invoke. If the compiler can figure out at compile time which implementation of a method it needs to choose, it wins a few nanoseconds by opting out of dynamic dispatch.

What is synthesis Swift?

Synthesized/auto-synthesized properties in Objective C — these are called “stored properties” in Swift. You simply declare it with var topSpeed : Double or let topSpeed : Double = 4.2 in a class declaration, exactly as you would declare a local variable in a function body.

Which is the default for synthesized properties?

Default Synthesis Of Properties Clang provides support for autosynthesis of declared properties. Using this feature, clang provides default synthesis of those properties not declared @dynamic and not having user provided backing getter and setter methods.

What is Ivar Objective-C?

Refer to Propety, Instance Variable and @synthesize. …

What is an interface in Objective-C?

In Objective-C, the class interface specifies exactly how a given type of object is intended to be used by other objects. In other words, it defines the public interface between instances of the class and the outside world.

What is method Swizzling in Objective-C and why would you use it?

Method swizzling is the process of changing the implementation of an existing selector. It’s a technique made possible by the fact that method invocations in Objective-C can be changed at runtime, by changing how selectors are mapped to underlying functions in a class’s dispatch table.

What are swift properties?

Properties associate values with a particular class, structure, or enumeration. Stored properties store constant and variable values as part of an instance, whereas computed properties calculate (rather than store) a value.