iOS Performance Optimization technology

Small summary, follow-up continue.

1. Several development details to improve application performance

* Try to avoid using constraint for animation

* Try to avoid using the array delete operation

* Try to avoid using Nsstring::stringwithformat

* Try to avoid using Nsimage::imagewithcontentoffile

* Threads require 1KB of kernel space and a minimum of 16KB of stack space

* All possible time-consuming operations, do not put in the main thread

* Timely removal of garbage (MRC, ARC) like some C functions, variables and other code blocks

2. Picture loading operation--one of the important factors that affect mobile application performance

	Imagecacheresize	Egoimageloading	Afnetworking	Hjcahce	Sdwebimage
Advantages	Sdwebimage+uiimage+resize	Custom Egoimageview	Asynchronously loaded, cached to memory	Asynchronous load, level two cache	Second-level cache, download optimization, GCD, support for arc, support for ARM64
Disadvantages	No longer maintained	Arc not supported, no longer maintained	The picture cannot be cached locally, dependent on Nscache	Complex interface, no longer maintenance	Resource consumption

3. The main culprit of mobile app performance-10

* Connection Timeout

* Network Hijacking

* Flash Back

* Poor interactive performance

* Lag

* CPU Usage frequency problem

* Crash

* Memory leaks

* Monochrome Screen

* Bad interface

iOS performance Optimization technology