Before the articles I want to sigh, official things must to explore, official gives too much good tutorial, a lot of things, I think most of the very basic things iOS developers don’t understand, are estimated as well as I know the type code, write the App, but for the entire framework iOS doesn’t know much, Recently I have been taking some spare time to study, the only discovery is that the official is the best. What I posted today is all about the design of the official website. Some people may think it is the designer’s business, but IN my heart, I think it is my own business. If MY brain is not good enough to remember numbers, I should post them and have a look when I can’t remember them.

Note: the iPhone X is coming, so please go to the official website to read it carefully. This article is old.

The official reference

NavigationBar, ToolBar, and TabBar icon size standards

### Startup screen size standard

Every App must provide an App icon. After the App is installed, a small icon is used on the home screen and throughout the system. The App Store uses a large icon, as shown below

###Spotlight, set and notification icon size standard

Good, so much, more detailed can go to the official reference to see, I just learner and record, wish all colleagues progress.