The apartment property is optional, because a person may not always have an apartment. Similarly, every Apartment instance has a unit property of type String and has an optional tenant property that is initially nil. The tenant property is optional because an apartment may not always have a tenant. Memory management is very important in any application, especially in iOS apps that have memory and other josephthore.me refers to ARC, MRC. the ARC memory management model. at how ARC works, and how to avoid common memory-related issues, Grab the Xcode project containing all of the sample code from this article. Explains how to allocate and deallocate objects in Cocoa.
A well-written program uses as little memory as possible. 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. Although memory management is typically considered at the level of an individual object, your goal is actually to manage object graphs.
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how arc works in ios
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