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 (22 chapters)
iOS Programming Cookbook
About the Author
About the Reviewer
Customer Feedback

Measuring energy impact

All users suffer from the draining of the life of their mobile phone's battery during usage. What a frustrating moment when you see your phone is about to die and you don't have access to any power supply. Developers, your device, and the operating system are all involved in taking care of the battery life. Any inefficient way of performing a task in the app may cause an impact on the battery life and needs your intervention to do it in a better way. In this recipe, we will see how to measure the app energy usage from Instruments.

How to do it...

  1. Pick any Xcode project you have, and click on Profile.

  2. Choose Energy Log from the following list of instruments:

  3. Choose the device/simulator and the app from the target device and process list.

  4. Click on the Record button at the top-left corner.

  5. Use the app that you want to record normally, and then click on the Stop button.

  6. You should see a detailed analysis of the energy used:

  7. There is another way to log the energy usage while...