Big screen iphone enables high-resolution mode

from:http://blog.ibireme.com/2014/09/16/adapted_to_iphone6/

Published by Ibireme on 2014/09/16

Since Apple has a big screen iphone, iOS development has to be adapted, presumably Android programmers are stealing music;) Here's a summary of the big screen adaptations that you've learned about these days.

enable high-resolution mode

Starting with the Xcode6 GM version, the simulator adds the IPhone6 and IPhone6 plus two, and if the old project runs directly into these two simulators, the default is "Compatibility Mode", that is, the system will simply enlarge the content, the display effect is somewhat vague but acceptable. The device resolution and IPhone5 acquired within the app are the same: 320*568 point.

There are 2 ways to enable high-resolution mode (currently I can find):

1. Add the launchimage of the large screen:
In Images.xcassets, delete the old Launchimage group, and then create a new Launchimage group to add the corresponding high-resolution picture. Here's a more detailed description: How to Add a Launch Image for the IPhone 6. If you want to quickly test the new effect, here are 3 sample images to download.

2. Add Launch screen File

Launch screen is a new feature of Xcode6 and IOS8, and it uses a xib file as a splash. This property is automatically ignored when the app is launched in the previous version of iOS and does not cause an exception.
First, click New File->ios User Interface->launch screen, and then enable it in the project setup:

The above two settings allow the app to enter high-resolution mode as long as any one is enabled, but if neither is set, the app will fall back to compatibility mode. Given that many apps now need to be compatible with IOS5, and the first method may have bugs on iOS5, the second approach is recommended.

Display of resources

A picture wins thousands of words, first here is a complete chart: http://www.paintcodeapp.com/news/iphone-6-screens-demystified.

Simply put: IPhone4, IPhone5, iPhone6 the PPI of these devices are the same, the default image priority is @2x. IPhone6 Plus has a higher pixel density and the default image takes precedence over @3x.

In addition, IPhone6 Plus is a bit different from other devices: the screen resolution obtained within the app is 1242*2208, but the actual resolution of the device is 1920*1080, when the system will zoom in on the overall display, downscale to 1/1.15. This feature has also appeared on OSX:

Here are some of the data that might be useful:

Point Scale

	iPhone	iPhone4	iPhone5	iPhone6	iphone6+
	320*480	320*480	320*568	375*667	414*736
Pixel	320*480	640*960	640*1136	750*1334	1242*2208
pexel (equipment)	~	~	~	~	1920*1080
	1	2	2	2	3
PPI	163	326	326	326	401