How to install iOS 7.0 and iOS 8.0 Simulators in Xcode 6.1?
Only iOS 7.0 and later simulators are supported on Xcode 6.0.x and 6.1.x. Only iOS 7.1 and later simulators are supported on Xcode 6.2 and greater.
The older simulators runtimes are not compatible with the new CoreSimulator architecture. You need to install Xcode 5.1.x if you want to run iOS 6.x simulators.
The iOS 7.0 simulator does not work on OSX Yosemite, so you need to be on OS X Mavericks if you want to run the iOS 7.0 simulator.
The iOS 8.0 simulator is not available as DLC. It is only supported in Xcode 6.0. If you really want to use it with newer versions of Xcode, you can try copying the iPhoenSimulator8.0.sdk and iOS 8.0.simruntime from Xcode 6.0 into Xcode 6.1, but as stated, this is not supported.
See:
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Library/CoreSimulator/Profiles/Runtimes/iOS 8.0.simruntime
/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator8.0.sdk
How to install iOS 7 and onwards simulators in Xcode 7 Beta 5?
Older Simulator runtimes are available for download through Xcode's preferences.
Goto Xcode -> Preferences -> Downloads to see the list of compatible legacy simulator runtimes.
El Capitan supports iOS 8.1 and newer runtimes.
Yosemite supports iOS 7.1 and newer runtimes.
There is a known issue mentioned in the Xcode release notes which prevents the iOS 7.1 simulator runtime from working in Xcode 7.
Thus, you can't currently use the iOS 7.1 simulator runtime with Xcode 7.
where are my iOS simulators in xcode 6 after yosemite installation?
In Xcode 6.1 you can add simulators manually.
To do so go to Window -> Devices and press the + symbol left at the bottom.
Then you can choose a combination of device type and iOS version to create.
if the iOS version you wanted is not there you'll be ask to download more simulator and directed to Xcode->Preference->Downloads.
Note: you can directly go to Xcode->Preference->Downloads and download more simulators and it will automatically available in simulator list after download.
New Xcode 6 Project - How to run in the iOS 7 Simulator
In the Devices window, delete all devices one by one. Now add them back one by one. Now restart the computer (not just Xcode). This will leave you with only good devices and you'll know whether you need to download the older simulators.
Base SDK 6.1 doesnt show iOS 8 simulators in Xcode 6.0.1
Download the other available iOS simulators (7.1 , 7.0 and 6). Worked for me
Xcode 7 & iOS 7 simulator
Yes, you can have multiple copies of Xcode.app installed on the same computer and switch between them. You may run into issues if you try to use both at the same time, but as long as you quit one before using the other, you should be fine.
There is no way to install the iOS 7.0 Simulator with Xcode 7.0. The iOS 7.0 Simulator Runtime is not supported on Yosemite and newer host OS versions, and Xcode 7.0 is only supported on Yosemite and later. You will need to use a Mavericks host OS in order to use the iOS 7.0 Simulator Runtime. If you would be satisfied with the iOS 7.1 Simulator Runtime, that is still supported on Yosemite (but not El Capitan) when using Xcode 6.x (but not Xcode 7.0).
In regards to opening your project in different Xcode versions, there shouldn't be any problems like that.
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