What is Autorelease pool IOS?

What is Autorelease pool IOS?

An autorelease pool stores objects that are sent a release message when the pool itself is drained. Important. If you use Automatic Reference Counting (ARC), you cannot use autorelease pools directly. Instead, you use @autoreleasepool blocks.

What does Autorelease pool do?

Autorelease pool blocks provide a mechanism whereby you can relinquish ownership of an object, but avoid the possibility of it being deallocated immediately (such as when you return an object from a method).

What is Autorelease pool in 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.

What is Objective-C memory management?

Application memory management is the process of allocating memory during your program’s runtime, using it, and freeing it when you are done with it. In Objective-C, it can also be seen as a way of distributing ownership of limited memory resources among many pieces of data and code. …

What is Autorelease Objective-C?

The -autorelease message is a deferred -release message. You send it to an object when you no longer need a reference to it but something else might. If you are using NSRunLoop, an autorelease pool will be created at the start of every run loop iteration and destroyed at the end.

What is ARC iOS?

Swift uses Automatic Reference Counting (ARC) to track and manage your app’s memory usage. In most cases, this means that memory management “just works” in Swift, and you don’t need to think about memory management yourself.

What is assign in iOS?

assign -assign is the default and simply performs a variable assignment -assign is a property attribute that tells the compiler how to synthesize the property’s setter implementation -I would use assign for C primitive properties and weak for weak references to Objective-C objects.

How is Autorelease pool managed?

Autorelease pool blocks provide a mechanism whereby you can release ownership of an object, In an iOS app, the main function is running in an autorelease pool. A drain operation of that pool will happen at the end of every main run loop.

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.

How do you free an object Objective-C?

Also you have to release this property in the dealloc . The correct way is to do this: self. printButton = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(printWebPage:)] autorelease];

What is memory management in iOS?

Memory management is the programming discipline of managing the life cycles of objects and freeing them when they are no longer needed. Note: In OS X, you can either explicitly manage memory or use the garbage collection feature of Objective-C. Garbage collection is not available in iOS.

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.