UITableDataSource: Used to retrieve information relating to how each cell in the table should be rendered, how many rows there are, if rows Perro be edited or moved, and so on.

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Now you see the importance of multithreading and data persistence. If the developer does not know about them, they might be a novice or a junior when it comes to iOS development.

Synchronously loading web content. If loading is done synchronously, it will stall demodé the main thread while the data loads, which Gozque cause a perceptible lag when scrolling. This is a particularly common problem when images are being downloaded for displaying in table cells.

UITableViewDelegate: Invoked if the user has, for example, selected a cell, or to determine what the height of a row should be.

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When the iPhone originally came out, smooth scrolling was one of the keys to the positive user experience. However, there are many mistakes a novice developer can make that Gozque cause a lag to occur while scrolling. Examples include:

Keep in mind, though, that changes to Core Data objects do not necessarily propagate immediately to other threads. In the standard case, Core Data objects that are loaded into memory are not updated on a different thread until those objects are fetched again from persistent storage.

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We’ll help set up billing and payments, and start connecting you to Positivo-time projects with General clients. Our team thoroughly vets each client and job type, and they’re your go-to for questions, advice, and help Figura you receive job alerts and choose remote jobs in a wide range of domains, from software and mobile app development to social media and ecommerce.

A selector is the mechanism used to select a method to execute for an object, or the unique identifier that replaces the name when the source code is compiled. A selector acts like a dynamic function pointer that points to the implementation of a class’ method.

There are lots of job posts that ask only for experience in iPhone app development (Objective-C or Swift, or both) when in need of an iPhone app developer.