Book Image

iOS Programming Cookbook

By : Hossam Ghareeb
Book Image

iOS Programming Cookbook

By: Hossam Ghareeb

Overview of this book

Do you want to understand all the facets of iOS programming and build complex iOS apps? Then you have come to the right place. This problem-solution guide will help you to eliminate expensive learning curves and focus on specific issues to make you proficient at tasks and the speed-up time involved. Beginning with some advanced UI components such as Stack Views and UICollectionView, you will gradually move on to building an interface efficiently. You will work through adding gesture recognizer and touch elements on table cells for custom actions. You will work with the Photos framework to access and manipulate photos. You will then prepare your app for multitasking and write responsive and highly efficient apps. Next, you will integrate maps and core location services while making your app more secure through various encryption methods. Finally, you will dive deep into the advanced techniques of implementing notifications while working with memory management and optimizing the performance of your apps. By the end of the book, you will master most of the latest iOS 10 frameworks.
Table of Contents (16 chapters)

Updating and deleting records from Core Data

While dealing with objects in databases, you will need to know how to update or delete objects. In Core Data, these kinds of operations are made easy and, with just simple APIs, you can perform these operations. In this section, we will see how a user can edit the name of task list or delete it.

How to do it...

  1. Let's start with deleting lists. Open the TasksListManager.swift file, and add the following function:
     func deleteList(list: TaskList){ 
 
          self.managedObjectContext.delete(list) 
          do{ 
              try self.managedObjectContext.save() 
          } 
          catch{ 
              print(error) 
          } 
      } 
 
  1. Add the following extension...