What size are layouts?

Question

Design

The task is to draw the design of a mobile application for iOS.
What size to create layouts and what resolution to do?

Answer 1

How not quite right. When creating an application for ios, for example, you need to take into account that the resolution in the specification is indicated for a retina display and the dimensions of the elements must be multiplied by two. Take a width of 320 or 640, this is a width of 4-4s-5-5s-5c. Under 6-6plus, you already adapt together with the developer.

Answer 2

320x480 and draw in vector to resize to higher resolutions later.

Answer 3

I didn't give the link in the first place. Here screensiz.es/phone
Look at the sizes of the devices and make them the largest.
But you still need to consider resizes.
If only iPhone, then 6+ size is 1080x1920.
Resolution 72, you do for devices and the web.