What is atomic and Nonatomic in Objective C?
Atomic means only one thread accesses the variable (static type). Atomic is thread-safe, but it is slow. Nonatomic means multiple threads access the variable (dynamic type). Nonatomic is thread-unsafe, but it is fast.
What does non Atomic mean?
b : not relating to, being, or involving atomic weapons nonatomic bombs/weapons a nonatomic war.
What is @property in Objective C?
The goal of the @property directive is to configure how an object can be exposed. If you intend to use a variable inside the class and do not need to expose it to outside classes, then you do not need to define a property for it. Properties are basically the accessor methods.
What is @synthesize Objective C?
Default. By default, @synthesize generates a member variable with the same name as the target of the set/get. the instance variable will bear the same name as the property. In this example, the instance variable will also be called firstName, without an underscore.
What is non Atomic attribute?
Non atomic properties has no guarantee regarding the returned value . It can be the correct value, a partially written value or even some garbage value. As most things that are not safe — this comes with enhanced speed of accessing this properties.
What is non atomic data?
Non-atomic data-driven tests. Each data row of your data source is represented by a test of its own. This means that each data row produces a failed or passed test result.
What is a non atomic task?
A task is an atomic activity, meaning it has no internal subparts known to the model. A subprocess is compound, or non-atomic, meaning it does have subparts in the model. It can therefore be expressed as a process.
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 delegate in Objective-C?
An Objective-C delegate is an object that has been assigned to the delegate property another object. To create one, you define a class that implements the delegate methods you’re interested in, and mark that class as implementing the delegate protocol.
What is @dynamic in Objective-C?
@dynamic is for properties where you’re not providing an implementation at compile time, but adding it later via Objective-C runtime magic.
What is copy property?
“The copy attribute is an alternative to strong. Instead of taking ownership of the existing object, it creates a copy of whatever you assign to the property, then takes ownership of that. Only objects that conform to the NSCopying protocol can use this attribute…”
What does Nonatomic mean in Objective-C?
Nonatomic means multiple thread access the variable (dynamic type). Nonatomic is thread unsafe. But it is fast in performance. Nonatomic is NOT default behavior; we need to add nonatomic keyword in property attribute.
