为什么 Xcode 6.3.1 方案选择器中没有显示模拟器？
Why aren't simulators showing in the Xcode 6.3.1 scheme selector?
我似乎无法在 Xcode 6.3.1
中构建模拟器
方案选择器仅列出 iOS Device 或我插入的设备，如下所示：
xcodebuild -showsdks 列出：
OS X SDKs:
OS X 10.9 -sdk macosx10.9
OS X 10.10 -sdk macosx10.10
iOS SDKs:
iOS 8.3 -sdk iphoneos8.3
iOS Simulator SDKs:
Simulator - iOS 8.3 -sdk iphonesimulator8.3
它似乎位于应用程序包中的正确位置。
我也无法使用 xcodebuild
为 i386 和 x86_64 构建
xcrun simctl list的输出如下：
== Device Types ==
iPhone 4s (com.apple.CoreSimulator.SimDeviceType.iPhone-4s)
iPhone 5 (com.apple.CoreSimulator.SimDeviceType.iPhone-5)
iPhone 5s (com.apple.CoreSimulator.SimDeviceType.iPhone-5s)
iPhone 6 Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus)
iPhone 6 (com.apple.CoreSimulator.SimDeviceType.iPhone-6)
iPad 2 (com.apple.CoreSimulator.SimDeviceType.iPad-2)
iPad Retina (com.apple.CoreSimulator.SimDeviceType.iPad-Retina)
iPad Air (com.apple.CoreSimulator.SimDeviceType.iPad-Air)
Resizable iPhone (com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone)
Resizable iPad (com.apple.CoreSimulator.SimDeviceType.Resizable-iPad)
== Runtimes ==
iOS 8.3 (8.3 - 12F69) (com.apple.CoreSimulator.SimRuntime.iOS-8-3)
== Devices ==
-- iOS 8.3 --
-- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-7-0 --
iPhone 4s (12AE8BFB-0540-4BC0-AB56-459304D05E2A) (Shutdown) (unavailable, runtime profile not found)
iPhone 5 (1DA1B3F7-48D5-484E-95F9-CF913DF85B63) (Shutdown) (unavailable, runtime profile not found)
iPhone 5s (A1B771C1-834F-4E05-A04F-7E9A3505D46E) (Shutdown) (unavailable, runtime profile not found)
iPad 2 (B4E0D353-F942-459E-995C-49183245ECAA) (Shutdown) (unavailable, runtime profile not found)
iPad Retina (6D7E2406-9C7A-40DC-B217-D0B0FE3CEAEE) (Shutdown) (unavailable, runtime profile not found)
iPad Air (B03E0F6B-3110-40CD-98F8-190726489B56) (Shutdown) (unavailable, runtime profile not found)
-- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-7-1 --
iPhone 4s (0DB72F1A-A5D0-4556-A49E-B96853B439F2) (Shutdown) (unavailable, runtime profile not found)
iPhone 5 (22BFA786-5AE0-4ABA-9062-DE358CFB0D6C) (Shutdown) (unavailable, runtime profile not found)
iPhone 5s (2F59F49A-AAF8-40C3-BB60-30C729A979F3) (Shutdown) (unavailable, runtime profile not found)
iPad 2 (DCAB9F55-9D6B-473E-9433-D2D48203B4DB) (Shutdown) (unavailable, runtime profile not found)
iPad Retina (8F74FE32-DE70-4C4B-9D81-21856C9866DA) (Shutdown) (unavailable, runtime profile not found)
iPad Air (650CF55A-2BD7-425A-8939-CADEADB7068A) (Shutdown) (unavailable, runtime profile not found)
-- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-8-0 --
iPhone 4s (73837B7E-8E11-4616-AE13-23F60728FBF3) (Shutdown) (unavailable, runtime profile not found)
iPhone 5 (2E3268E4-2E35-44BC-AF3D-F32306D44F13) (Shutdown) (unavailable, runtime profile not found)
iPhone 5s (C8ECDF4C-DE68-4A73-9ECA-546E85A3DA80) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 Plus (BB59A82C-BC47-4B51-A3B8-F0123394292A) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 (8E37DC02-393F-4695-980C-8679A5D56E46) (Shutdown) (unavailable, runtime profile not found)
iPad 2 (7503B827-8037-4465-AE57-02AFB54CE204) (Shutdown) (unavailable, runtime profile not found)
iPad Retina (6629BF4B-6CBA-43A3-8EA2-93272933D086) (Shutdown) (unavailable, runtime profile not found)
iPad Air (61747A6D-BDDC-4906-87DA-CB8FD0678A93) (Shutdown) (unavailable, runtime profile not found)
Resizable iPhone (CFD3BE4E-1205-4EF6-BF4B-F1CFE5490040) (Shutdown) (unavailable, runtime profile not found)
Resizable iPad (89A63BCF-A654-44BE-8362-5544F5FA1CAF) (Shutdown) (unavailable, runtime profile not found)
-- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-8-1 --
iPhone 4s (FE578030-E512-4643-9F28-FCDCCD74279F) (Shutdown) (unavailable, runtime profile not found)
iPhone 5 (9C328DC5-2E4F-47AB-ABBA-1C881DE48795) (Shutdown) (unavailable, runtime profile not found)
iPhone 5s (8D91EB18-594B-4288-BBF4-BF2655308706) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 Plus (70F1B2D6-966D-49F0-B6CE-BCF995F425CB) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 (53510FD4-EEE0-487E-B20E-F9F8AC65BA57) (Shutdown) (unavailable, runtime profile not found)
iPad 2 (3B316D24-6497-45C1-BE0D-690FA831D6A3) (Shutdown) (unavailable, runtime profile not found)
iPad Retina (55ED45DA-3ACB-479C-9FF9-F0905B47A497) (Shutdown) (unavailable, runtime profile not found)
iPad Air (52AE24F1-92AE-4198-A196-32A4691903D8) (Shutdown) (unavailable, runtime profile not found)
Resizable iPhone (1E16E2F4-BC24-4F3D-AB1F-C07A6FA52E6F) (Shutdown) (unavailable, runtime profile not found)
Resizable iPad (95254D91-345C-446E-8CC7-72382C0AB8AD) (Shutdown) (unavailable, runtime profile not found)
-- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-8-2 --
iPhone 4s (4370C11F-7486-4E16-AD62-04BC6ECF23CC) (Shutdown) (unavailable, runtime profile not found)
iPhone 5 (1635F9A2-5CD6-4669-B69B-493EDA2736BF) (Shutdown) (unavailable, runtime profile not found)
iPhone 5s (AD9B417C-BB60-4A94-A080-4E9A00577762) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 Plus (A1575F64-44E1-4999-985E-88B890354A36) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 (44F34FBC-924E-4226-AF8B-C9C76C618457) (Shutdown) (unavailable, runtime profile not found)
iPad 2 (180A9123-2F6C-423D-A124-CAAEEC8661D5) (Shutdown) (unavailable, runtime profile not found)
iPad Retina (0BBD9657-498C-4823-BA0B-4A5EA7305224) (Shutdown) (unavailable, runtime profile not found)
iPad Air (57E7ED1B-89BB-4C0E-A167-7D6FDD97E838) (Shutdown) (unavailable, runtime profile not found)
Resizable iPhone (C56D2AC5-9F7A-4C8B-BCED-997A32D7342B) (Shutdown) (unavailable, runtime profile not found)
Resizable iPad (27E051F5-F718-4BDC-99AA-F8C66B66505E) (Shutdown) (unavailable, runtime profile not found)
核心模拟器日志的适用部分是：
May 5 14:31:07 Fangorn-Farm-3.local CoreSimulatorService[6031] <Notice>: com.apple.CoreSimulator.CoreSimulatorService 117.15~1 starting.
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/14E7FDD6-751B-4A81-9CAF-B7F8359C553F/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/57028519-A154-4768-87D7-589111236C12/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/726D5E5A-A5C2-4EEA-B18E-C5174AE7EFD4/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/79272BA7-45B9-47C4-A74E-91A9A1C02141/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/A4526FAE-721D-488F-B9F6-D0D6A31EE579/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/ACE62A2C-E3E0-408F-A198-983D244107E7/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/DB987632-15E5-4CB4-B20C-1FF8FF4606C6/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/E1F83FA1-F630-4CDB-9E2D-8792797BEA5E/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/E45166AD-7ED3-4001-B01C-3B8F8497ECEA/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/FE7A9682-FF80-4F7E-9817-A1B2CFDA0328/device.plist
May 5 14:31:08 Fangorn-Farm-3.local com.apple.dt.Xcode[754] <Warning>: CoreSimulatorService connection interrupted. Resubscribing to notifications.
~/Library/Developer/CoreSimulator/Devices/.default_created.plist的内容是：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-7-0</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>B4E0D353-F942-459E-995C-49183245ECAA</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>B03E0F6B-3110-40CD-98F8-190726489B56</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>6D7E2406-9C7A-40DC-B217-D0B0FE3CEAEE</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>12AE8BFB-0540-4BC0-AB56-459304D05E2A</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>1DA1B3F7-48D5-484E-95F9-CF913DF85B63</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>A1B771C1-834F-4E05-A04F-7E9A3505D46E</string>
</dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-7-1</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>DCAB9F55-9D6B-473E-9433-D2D48203B4DB</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>650CF55A-2BD7-425A-8939-CADEADB7068A</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>8F74FE32-DE70-4C4B-9D81-21856C9866DA</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>0DB72F1A-A5D0-4556-A49E-B96853B439F2</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>22BFA786-5AE0-4ABA-9062-DE358CFB0D6C</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>2F59F49A-AAF8-40C3-BB60-30C729A979F3</string>
</dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-8-0</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPad</key>
<string>89A63BCF-A654-44BE-8362-5544F5FA1CAF</string>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone</key>
<string>CFD3BE4E-1205-4EF6-BF4B-F1CFE5490040</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>7503B827-8037-4465-AE57-02AFB54CE204</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>61747A6D-BDDC-4906-87DA-CB8FD0678A93</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>6629BF4B-6CBA-43A3-8EA2-93272933D086</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>73837B7E-8E11-4616-AE13-23F60728FBF3</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>2E3268E4-2E35-44BC-AF3D-F32306D44F13</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>C8ECDF4C-DE68-4A73-9ECA-546E85A3DA80</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6</key>
<string>8E37DC02-393F-4695-980C-8679A5D56E46</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus</key>
<string>BB59A82C-BC47-4B51-A3B8-F0123394292A</string>
</dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-8-1</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPad</key>
<string>95254D91-345C-446E-8CC7-72382C0AB8AD</string>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone</key>
<string>1E16E2F4-BC24-4F3D-AB1F-C07A6FA52E6F</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>3B316D24-6497-45C1-BE0D-690FA831D6A3</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>52AE24F1-92AE-4198-A196-32A4691903D8</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>55ED45DA-3ACB-479C-9FF9-F0905B47A497</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>FE578030-E512-4643-9F28-FCDCCD74279F</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>9C328DC5-2E4F-47AB-ABBA-1C881DE48795</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>8D91EB18-594B-4288-BBF4-BF2655308706</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6</key>
<string>53510FD4-EEE0-487E-B20E-F9F8AC65BA57</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus</key>
<string>70F1B2D6-966D-49F0-B6CE-BCF995F425CB</string>
</dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-8-2</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPad</key>
<string>27E051F5-F718-4BDC-99AA-F8C66B66505E</string>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone</key>
<string>C56D2AC5-9F7A-4C8B-BCED-997A32D7342B</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>180A9123-2F6C-423D-A124-CAAEEC8661D5</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>57E7ED1B-89BB-4C0E-A167-7D6FDD97E838</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>0BBD9657-498C-4823-BA0B-4A5EA7305224</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>4370C11F-7486-4E16-AD62-04BC6ECF23CC</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>1635F9A2-5CD6-4669-B69B-493EDA2736BF</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>AD9B417C-BB60-4A94-A080-4E9A00577762</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6</key>
<string>44F34FBC-924E-4226-AF8B-C9C76C618457</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus</key>
<string>A1575F64-44E1-4999-985E-88B890354A36</string>
</dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-8-3</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPad</key>
<string>726D5E5A-A5C2-4EEA-B18E-C5174AE7EFD4</string>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone</key>
<string>14E7FDD6-751B-4A81-9CAF-B7F8359C553F</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>79272BA7-45B9-47C4-A74E-91A9A1C02141</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>FE7A9682-FF80-4F7E-9817-A1B2CFDA0328</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>E45166AD-7ED3-4001-B01C-3B8F8497ECEA</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>DB987632-15E5-4CB4-B20C-1FF8FF4606C6</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>E1F83FA1-F630-4CDB-9E2D-8792797BEA5E</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>57028519-A154-4768-87D7-589111236C12</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6</key>
<string>ACE62A2C-E3E0-408F-A198-983D244107E7</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus</key>
<string>A4526FAE-721D-488F-B9F6-D0D6A31EE579</string>
</dict>
<key>version</key>
<integer>0</integer>
</dict>
</plist>
如果您重命名或移动 Xcode.app，就会发生这种情况。尝试将其重命名回之前的名称或重新启动。如果这不能解决问题，您应该查看 'xcrun simctl list' 和 ~/Library/Developer/CoreSimulator/Devices 以查看您是否有任何设备。
同时检查 ~/Library/Logs/CoreSimulator 是否有任何错误日志。
从添加的日志记录和提供的信息来看，问题是您在某个时候为您创建了 iOS 8.3 设备（这就是 UUID 出现在 .default_created.plist 文件中的原因），但是他们的 device.plist 文件被删除了，所以系统（正确地）不再列出他们。
我不确定 device.plist 文件是如何从您的系统中删除的，但是您可以通过以下方式返回到原始状态：
sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService
rm -rf ~/Library/*/CoreSimulator
试试这个...
1.Run 来自应用程序的模拟器（或来自 spotlight）
2.Hardware ----> 设备 ---> 管理设备。
3.A 弹出窗口将打开，在该屏幕的左下角，您会找到“+”，使用 + 为不同的 ios 版本添加新模拟器
在我的例子中，我下载了 iOS 8.2 版本的模拟器，并且在项目中 iOS 部署目标高于下载版本，所以它没有显示，一旦你将它更改为低于下载版本它会开始显示。如果您遇到任何问题，请告诉我。
我似乎无法在 Xcode 6.3.1
中构建模拟器方案选择器仅列出 iOS Device 或我插入的设备，如下所示：
xcodebuild -showsdks 列出：
OS X SDKs:
OS X 10.9 -sdk macosx10.9
OS X 10.10 -sdk macosx10.10
iOS SDKs:
iOS 8.3 -sdk iphoneos8.3
iOS Simulator SDKs:
Simulator - iOS 8.3 -sdk iphonesimulator8.3
它似乎位于应用程序包中的正确位置。
我也无法使用 xcodebuild
为 i386 和 x86_64 构建xcrun simctl list的输出如下：
== Device Types ==
iPhone 4s (com.apple.CoreSimulator.SimDeviceType.iPhone-4s)
iPhone 5 (com.apple.CoreSimulator.SimDeviceType.iPhone-5)
iPhone 5s (com.apple.CoreSimulator.SimDeviceType.iPhone-5s)
iPhone 6 Plus (com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus)
iPhone 6 (com.apple.CoreSimulator.SimDeviceType.iPhone-6)
iPad 2 (com.apple.CoreSimulator.SimDeviceType.iPad-2)
iPad Retina (com.apple.CoreSimulator.SimDeviceType.iPad-Retina)
iPad Air (com.apple.CoreSimulator.SimDeviceType.iPad-Air)
Resizable iPhone (com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone)
Resizable iPad (com.apple.CoreSimulator.SimDeviceType.Resizable-iPad)
== Runtimes ==
iOS 8.3 (8.3 - 12F69) (com.apple.CoreSimulator.SimRuntime.iOS-8-3)
== Devices ==
-- iOS 8.3 --
-- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-7-0 --
iPhone 4s (12AE8BFB-0540-4BC0-AB56-459304D05E2A) (Shutdown) (unavailable, runtime profile not found)
iPhone 5 (1DA1B3F7-48D5-484E-95F9-CF913DF85B63) (Shutdown) (unavailable, runtime profile not found)
iPhone 5s (A1B771C1-834F-4E05-A04F-7E9A3505D46E) (Shutdown) (unavailable, runtime profile not found)
iPad 2 (B4E0D353-F942-459E-995C-49183245ECAA) (Shutdown) (unavailable, runtime profile not found)
iPad Retina (6D7E2406-9C7A-40DC-B217-D0B0FE3CEAEE) (Shutdown) (unavailable, runtime profile not found)
iPad Air (B03E0F6B-3110-40CD-98F8-190726489B56) (Shutdown) (unavailable, runtime profile not found)
-- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-7-1 --
iPhone 4s (0DB72F1A-A5D0-4556-A49E-B96853B439F2) (Shutdown) (unavailable, runtime profile not found)
iPhone 5 (22BFA786-5AE0-4ABA-9062-DE358CFB0D6C) (Shutdown) (unavailable, runtime profile not found)
iPhone 5s (2F59F49A-AAF8-40C3-BB60-30C729A979F3) (Shutdown) (unavailable, runtime profile not found)
iPad 2 (DCAB9F55-9D6B-473E-9433-D2D48203B4DB) (Shutdown) (unavailable, runtime profile not found)
iPad Retina (8F74FE32-DE70-4C4B-9D81-21856C9866DA) (Shutdown) (unavailable, runtime profile not found)
iPad Air (650CF55A-2BD7-425A-8939-CADEADB7068A) (Shutdown) (unavailable, runtime profile not found)
-- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-8-0 --
iPhone 4s (73837B7E-8E11-4616-AE13-23F60728FBF3) (Shutdown) (unavailable, runtime profile not found)
iPhone 5 (2E3268E4-2E35-44BC-AF3D-F32306D44F13) (Shutdown) (unavailable, runtime profile not found)
iPhone 5s (C8ECDF4C-DE68-4A73-9ECA-546E85A3DA80) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 Plus (BB59A82C-BC47-4B51-A3B8-F0123394292A) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 (8E37DC02-393F-4695-980C-8679A5D56E46) (Shutdown) (unavailable, runtime profile not found)
iPad 2 (7503B827-8037-4465-AE57-02AFB54CE204) (Shutdown) (unavailable, runtime profile not found)
iPad Retina (6629BF4B-6CBA-43A3-8EA2-93272933D086) (Shutdown) (unavailable, runtime profile not found)
iPad Air (61747A6D-BDDC-4906-87DA-CB8FD0678A93) (Shutdown) (unavailable, runtime profile not found)
Resizable iPhone (CFD3BE4E-1205-4EF6-BF4B-F1CFE5490040) (Shutdown) (unavailable, runtime profile not found)
Resizable iPad (89A63BCF-A654-44BE-8362-5544F5FA1CAF) (Shutdown) (unavailable, runtime profile not found)
-- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-8-1 --
iPhone 4s (FE578030-E512-4643-9F28-FCDCCD74279F) (Shutdown) (unavailable, runtime profile not found)
iPhone 5 (9C328DC5-2E4F-47AB-ABBA-1C881DE48795) (Shutdown) (unavailable, runtime profile not found)
iPhone 5s (8D91EB18-594B-4288-BBF4-BF2655308706) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 Plus (70F1B2D6-966D-49F0-B6CE-BCF995F425CB) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 (53510FD4-EEE0-487E-B20E-F9F8AC65BA57) (Shutdown) (unavailable, runtime profile not found)
iPad 2 (3B316D24-6497-45C1-BE0D-690FA831D6A3) (Shutdown) (unavailable, runtime profile not found)
iPad Retina (55ED45DA-3ACB-479C-9FF9-F0905B47A497) (Shutdown) (unavailable, runtime profile not found)
iPad Air (52AE24F1-92AE-4198-A196-32A4691903D8) (Shutdown) (unavailable, runtime profile not found)
Resizable iPhone (1E16E2F4-BC24-4F3D-AB1F-C07A6FA52E6F) (Shutdown) (unavailable, runtime profile not found)
Resizable iPad (95254D91-345C-446E-8CC7-72382C0AB8AD) (Shutdown) (unavailable, runtime profile not found)
-- Unavailable: com.apple.CoreSimulator.SimRuntime.iOS-8-2 --
iPhone 4s (4370C11F-7486-4E16-AD62-04BC6ECF23CC) (Shutdown) (unavailable, runtime profile not found)
iPhone 5 (1635F9A2-5CD6-4669-B69B-493EDA2736BF) (Shutdown) (unavailable, runtime profile not found)
iPhone 5s (AD9B417C-BB60-4A94-A080-4E9A00577762) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 Plus (A1575F64-44E1-4999-985E-88B890354A36) (Shutdown) (unavailable, runtime profile not found)
iPhone 6 (44F34FBC-924E-4226-AF8B-C9C76C618457) (Shutdown) (unavailable, runtime profile not found)
iPad 2 (180A9123-2F6C-423D-A124-CAAEEC8661D5) (Shutdown) (unavailable, runtime profile not found)
iPad Retina (0BBD9657-498C-4823-BA0B-4A5EA7305224) (Shutdown) (unavailable, runtime profile not found)
iPad Air (57E7ED1B-89BB-4C0E-A167-7D6FDD97E838) (Shutdown) (unavailable, runtime profile not found)
Resizable iPhone (C56D2AC5-9F7A-4C8B-BCED-997A32D7342B) (Shutdown) (unavailable, runtime profile not found)
Resizable iPad (27E051F5-F718-4BDC-99AA-F8C66B66505E) (Shutdown) (unavailable, runtime profile not found)
核心模拟器日志的适用部分是：
May 5 14:31:07 Fangorn-Farm-3.local CoreSimulatorService[6031] <Notice>: com.apple.CoreSimulator.CoreSimulatorService 117.15~1 starting.
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/14E7FDD6-751B-4A81-9CAF-B7F8359C553F/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/57028519-A154-4768-87D7-589111236C12/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/726D5E5A-A5C2-4EEA-B18E-C5174AE7EFD4/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/79272BA7-45B9-47C4-A74E-91A9A1C02141/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/A4526FAE-721D-488F-B9F6-D0D6A31EE579/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/ACE62A2C-E3E0-408F-A198-983D244107E7/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/DB987632-15E5-4CB4-B20C-1FF8FF4606C6/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/E1F83FA1-F630-4CDB-9E2D-8792797BEA5E/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/E45166AD-7ED3-4001-B01C-3B8F8497ECEA/device.plist
May 5 14:31:08 Fangorn-Farm-3.local CoreSimulatorService[6031] <Error>: Unable to load device.plist: /Users/montegoulding/Library/Developer/CoreSimulator/Devices/FE7A9682-FF80-4F7E-9817-A1B2CFDA0328/device.plist
May 5 14:31:08 Fangorn-Farm-3.local com.apple.dt.Xcode[754] <Warning>: CoreSimulatorService connection interrupted. Resubscribing to notifications.
~/Library/Developer/CoreSimulator/Devices/.default_created.plist的内容是：
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-7-0</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>B4E0D353-F942-459E-995C-49183245ECAA</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>B03E0F6B-3110-40CD-98F8-190726489B56</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>6D7E2406-9C7A-40DC-B217-D0B0FE3CEAEE</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>12AE8BFB-0540-4BC0-AB56-459304D05E2A</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>1DA1B3F7-48D5-484E-95F9-CF913DF85B63</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>A1B771C1-834F-4E05-A04F-7E9A3505D46E</string>
</dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-7-1</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>DCAB9F55-9D6B-473E-9433-D2D48203B4DB</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>650CF55A-2BD7-425A-8939-CADEADB7068A</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>8F74FE32-DE70-4C4B-9D81-21856C9866DA</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>0DB72F1A-A5D0-4556-A49E-B96853B439F2</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>22BFA786-5AE0-4ABA-9062-DE358CFB0D6C</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>2F59F49A-AAF8-40C3-BB60-30C729A979F3</string>
</dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-8-0</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPad</key>
<string>89A63BCF-A654-44BE-8362-5544F5FA1CAF</string>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone</key>
<string>CFD3BE4E-1205-4EF6-BF4B-F1CFE5490040</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>7503B827-8037-4465-AE57-02AFB54CE204</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>61747A6D-BDDC-4906-87DA-CB8FD0678A93</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>6629BF4B-6CBA-43A3-8EA2-93272933D086</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>73837B7E-8E11-4616-AE13-23F60728FBF3</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>2E3268E4-2E35-44BC-AF3D-F32306D44F13</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>C8ECDF4C-DE68-4A73-9ECA-546E85A3DA80</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6</key>
<string>8E37DC02-393F-4695-980C-8679A5D56E46</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus</key>
<string>BB59A82C-BC47-4B51-A3B8-F0123394292A</string>
</dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-8-1</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPad</key>
<string>95254D91-345C-446E-8CC7-72382C0AB8AD</string>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone</key>
<string>1E16E2F4-BC24-4F3D-AB1F-C07A6FA52E6F</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>3B316D24-6497-45C1-BE0D-690FA831D6A3</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>52AE24F1-92AE-4198-A196-32A4691903D8</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>55ED45DA-3ACB-479C-9FF9-F0905B47A497</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>FE578030-E512-4643-9F28-FCDCCD74279F</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>9C328DC5-2E4F-47AB-ABBA-1C881DE48795</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>8D91EB18-594B-4288-BBF4-BF2655308706</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6</key>
<string>53510FD4-EEE0-487E-B20E-F9F8AC65BA57</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus</key>
<string>70F1B2D6-966D-49F0-B6CE-BCF995F425CB</string>
</dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-8-2</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPad</key>
<string>27E051F5-F718-4BDC-99AA-F8C66B66505E</string>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone</key>
<string>C56D2AC5-9F7A-4C8B-BCED-997A32D7342B</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>180A9123-2F6C-423D-A124-CAAEEC8661D5</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>57E7ED1B-89BB-4C0E-A167-7D6FDD97E838</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>0BBD9657-498C-4823-BA0B-4A5EA7305224</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>4370C11F-7486-4E16-AD62-04BC6ECF23CC</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>1635F9A2-5CD6-4669-B69B-493EDA2736BF</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>AD9B417C-BB60-4A94-A080-4E9A00577762</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6</key>
<string>44F34FBC-924E-4226-AF8B-C9C76C618457</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus</key>
<string>A1575F64-44E1-4999-985E-88B890354A36</string>
</dict>
<key>com.apple.CoreSimulator.SimRuntime.iOS-8-3</key>
<dict>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPad</key>
<string>726D5E5A-A5C2-4EEA-B18E-C5174AE7EFD4</string>
<key>com.apple.CoreSimulator.SimDeviceType.Resizable-iPhone</key>
<string>14E7FDD6-751B-4A81-9CAF-B7F8359C553F</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-2</key>
<string>79272BA7-45B9-47C4-A74E-91A9A1C02141</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Air</key>
<string>FE7A9682-FF80-4F7E-9817-A1B2CFDA0328</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPad-Retina</key>
<string>E45166AD-7ED3-4001-B01C-3B8F8497ECEA</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-4s</key>
<string>DB987632-15E5-4CB4-B20C-1FF8FF4606C6</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5</key>
<string>E1F83FA1-F630-4CDB-9E2D-8792797BEA5E</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-5s</key>
<string>57028519-A154-4768-87D7-589111236C12</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6</key>
<string>ACE62A2C-E3E0-408F-A198-983D244107E7</string>
<key>com.apple.CoreSimulator.SimDeviceType.iPhone-6-Plus</key>
<string>A4526FAE-721D-488F-B9F6-D0D6A31EE579</string>
</dict>
<key>version</key>
<integer>0</integer>
</dict>
</plist>
如果您重命名或移动 Xcode.app，就会发生这种情况。尝试将其重命名回之前的名称或重新启动。如果这不能解决问题，您应该查看 'xcrun simctl list' 和 ~/Library/Developer/CoreSimulator/Devices 以查看您是否有任何设备。
同时检查 ~/Library/Logs/CoreSimulator 是否有任何错误日志。
从添加的日志记录和提供的信息来看，问题是您在某个时候为您创建了 iOS 8.3 设备（这就是 UUID 出现在 .default_created.plist 文件中的原因），但是他们的 device.plist 文件被删除了，所以系统（正确地）不再列出他们。
我不确定 device.plist 文件是如何从您的系统中删除的，但是您可以通过以下方式返回到原始状态：
sudo killall -9 com.apple.CoreSimulator.CoreSimulatorService
rm -rf ~/Library/*/CoreSimulator
试试这个...
1.Run 来自应用程序的模拟器（或来自 spotlight）
2.Hardware ----> 设备 ---> 管理设备。
3.A 弹出窗口将打开，在该屏幕的左下角，您会找到“+”，使用 + 为不同的 ios 版本添加新模拟器
在我的例子中，我下载了 iOS 8.2 版本的模拟器，并且在项目中 iOS 部署目标高于下载版本，所以它没有显示，一旦你将它更改为低于下载版本它会开始显示。如果您遇到任何问题，请告诉我。