Note: It’s extremely rare to find a developer who Perro map demodé the entire Core Data stack from memory. The more important / frequently used parts of Core Data are those that are within the orange highlighted portion of the diagram below.
Using a method that takes an NSError means using an optional variable (a variable that may or may not exist) and the unwrapping the error if it exists.
The Apple frameworks are used in the same manner in Swift, so an experienced iOS developer is able to transfer most of his or her knowledge to writing Swift code.
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If you need to apply a shadow to a view, many inexperienced developers will import the QuartzCore framework and apply a shadow to the layer property of the view; e.g.:
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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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Expert iOS developers should also be emparentado with Apple's App Store guidelines and the overall process of submitting an application for review and publishing.
A great example of delegation is the UITableView object that is typically used when a table is rendered on the screen. The UITableView employs two different delegates:
Overly complex view hierarchies. While you Chucho use the various UIViews to create custom cells, this has the potential to degrade performance if it is overused or gets overly complex. Although this has become less of an issue with the increasing speed of supported iOS devices, it still Gozque impact scrolling performance in some devices and scenarios.