What is Autoreleasepool Swift?

The autoreleasepool allows you to explicitly manage when autorelease objects are deallocated in Swift, just like you were able to in Objective-C. Note: When dealing with Swift native objects, you generally will not receive autorelease objects.

How do Autorelease pools work?

Every time -autorelease is sent to an object, it is added to the inner-most autorelease pool. When the pool is drained, it simply sends -release to all the objects in the pool. Autorelease pools are simply a convenience that allows you to defer sending -release until “later”.

Can we use Autoreleasepool block in ARC enabled application?

ARC uses autorelease as well as release . It needs an auto release pool in place to do so. ARC doesn’t create the auto release pool for you.

What is category in Swift?

(Unlike Objective-C categories, Swift extensions do not have names.) Uses: Categories are a way to modularize a class by spreading its implementation over many files. Extensions provide similar functionality. One of the most common uses of categories is to add methods to built-in data types like NSString or NSArray .

What is difference between category and extension in iOS?

A category allows you to add methods to an existing class—even to one for which you do not have the source. Class extensions are similar, but allow additional required APIs to be declared for a class in locations other than within the primary class @interface block.

What is NSRunLoop?

A NSRunLoop object processes input for sources, such as mouse and keyboard events from the window system and NSPort objects. A NSRunLoop object also processes NSTimer events. The system creates a NSRunLoop object as needed for each NSThread object, including the application’s main thread.

What is category in Objective C with example?

2 Answers. A category allows you to add methods to an existing class—even to one for which you do not have the source. There is a section in the Objective-C 2.0 programming Language document about Categories and Extensions.

What is a category in Objective C and when is it used?

Categories provide the ability to add functionality to an object without subclassing or changing the actual object. A handy tool, they are often used to add methods to existing classes, such as NSString or your own custom objects.

What is category in Objective-C with example?

What is a category in Objective-C and when is it used?

What is thread in Swift?

Using Grand Central Dispatch (GCD) to speed up your app First a precursor, threading is all about managing how work is prioritized in your app. Making your code execute faster is great, but what matters more is how fast the user perceives your app to be.

What is the difference between category VS extension?

Category and extension both are basically made to handle large code base, but category is a way to extend class API in multiple source files while extension is a way to add required methods outside the main interface file.