手动下载iOS模拟器安装

官方文档

安装和管理模拟器提供通过 Xcode 安装和命令行安装方式，如果下载速度太慢或者总是安装失败请参考下面：

How to Download iOS Simulator (Xcode) in Command Line and Install it

通过获取模拟器下载地址，使用其他多线程下载软件来手动下载，能更快下载速度。

Steps

0. Start Xcode in command line by running this in commandline /Applications/Xcode.app/Contents/MacOS/Xcode
1. Start downloading of the simulator
2. Cancel it. YES CANCEL IT!
3. You will get a message like this:
   2015-11-23 17:10:01.906 Xcode[30803:2505495] DVTDownloadable: Download Cancelled. Downloadable: https://devimages.apple.com.edgekey.net/downloads/xcode/simulators/com.apple.pkg.iPhoneSimulatorSDK8_3-8.3.1.1428621365.dmg.
4. Quit Xcode
5. Use your favorite download tool with the link in that message in step 3

• This is what I use: (5 concurrent connection) aria2c -x 5 link_to_the_file

6. Have Fun!

Wait! How can I install this?

By moving the file to ~/Library/Caches/com.apple.dt.Xcode/Downloads 或者/Users/xxxx/Library/Caches/com.apple.dt.Xcode/Downloads

• You can use Finder by open ~/Library/Caches/com.apple.dt.Xcode/Downloads
• Or just mv file ~/Library/Caches/com.apple.dt.Xcode/Downloads

And open the Downloads tab in Xcode’s Preferences,

• the progress bar of the item you just download should be 80% filled
• you should be able to click that download button to install the file
• 或者重启 Xcode 选择对应的模拟器安装，无需下载瞬间安装。

Why did I need it?

I am in China right now and when downloading in Xcode(no concurrent downloading), the download speed sucks!
I would like to use aria2 to speed up the downloading process of the simulator(s).

How slow was the connect using Xcode and how fast was it when using aria2?

• Xcode: 150KB -> 300KB
• aria2: 2.7MB (consistenly), which is the maximum downloading speed of my cable

Why aria2?

• Concurrent connections
• Resuming unfinished downloads

References

• https://forums.developer.apple.com/message/51550#52580 where I found out ~/Library/Caches/com.apple.dt.Xcode/Downloads
• 各iOS 模拟器下载地址懒得通过命令行获取地址的同学可以直接使用下载。