What is property OBJC?

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 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 is Instancetype?

instancetype. Use the instancetype keyword as the return type of methods that return an instance of the class they are called on (or a subclass of that class). These methods include alloc , init , and class factory methods.

What is a Nonatomic property?

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 does Nonatomic mean OBJC?

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.

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 @synthesize in Swift?

@synthesize – It generates the getter and setter methods for the property. @dynamic – It notifies the compiler that the getter and setter are implemented at some other place.

Can you copy attributes in after effects?

Hit “UU” — the U key twice rapidly. This will bring up any modified properties on the layer. Select the effect or property in the Timeline Panel beneath the layer and to copy it use Command+C if you’re on a Mac or Control+C if you’re on a PC.

What is Ns_unavailable?

In Objective-C we can mark certain methods as NS_UNAVAILABLE meaning we will get a compiler level error if there is an attempt to call them. This can be useful when a sub class wants to reduce the scope of the api of the superclass it inherits from.

What are Swift attributes?

There are two kinds of attributes in Swift—those that apply to declarations and those that apply to types. An attribute provides additional information about the declaration or type.

What is Swift property?

In Swift, properties are associated values that are stored in a class instance. OR we can say properties are the associate values with structure, class, or enumeration. There are two kinds of properties: stored properties and computed properties. Stored properties are properties that are stored in the class’s instance.