You may already have an amazing iOS app, or be developing one. Everything looks great except for some kinks that prohibit users from giving the app that final fifth star or prevent you from releasing it.Issues like a jitter when the user goes to the nth item in table view or the app hogging the network or consuming a lot battery are some of the visible symptoms that the user will be aware of. Howrever, the problems lie somewhere deeper.Tuning an app for performance is a never-ending task, especially with new app features, OS versions, third-party libraries, and device configurations. These are only some of the things that keep developers on their toes about app performance.According to a study, about a quarter of users abandon an app if it does not load within 3 seconds, and about a third of users will tell others about their poor experience.Users want apps that are fast, responsive, and do not hog resources. This book takes a look at various aspects that negatively impact use and outlines how you can tune your app for performance. Ready to build mobile apps that out-perform the rest? If you're an iOS developer with app-building experience, this practical guide provides tips and best practices to help you solve many common performance issues. You'll learn how to design and optimize iOS apps that deliver a smooth experience even when the network is poor and memory is low. Today's picky users want fast and responsive apps that don't hog resources. In this book, author Gaurav Vaish demonstrates methods for writing optimal code from an engineering perspective, using reusable Objective-C code that you can use right away. Up your game and create high-performance native iOS apps that truly stand out from the crowd. Measure key performance indicators—attributes that constitute and affect app performance Write efficient apps by minimizing memory and power consumption, and explore options for using available CPU cores Optimize your app's lifecycle and UI, as well as its networking, data sharing, and security features Learn about application testing, debugging and analysis tools, and monitoring your app in the wild Collect data from real users to analyze app usage, identify bottlenecks, and provide fixes Use iOS 9 upgrades to improve your app's performance Now that more people spend more time interacting with mobile apps than with their desktop counterparts, you need to think about your iOS app's performance the moment you write your first line of code. This practical hands-on guide shows you how. Through specific and concise tips for designing and optimizing your apps, author Gaurav Vaish provides solutions to many common performance scenarios, including reusable code that you can put to work right away. Ideal for experienced iOS developers, this book focuses on native iOS apps, rather than mobile web apps or hybrid apps.
