1)重命名你的模拟器，如果模拟器与相同的名称，但不同的iOS版本

Xcode -> Window -> Devices and Simulators -> Simulators.

2)打开react原生项目文件夹

3)编辑package.json

"scripts": {
    "start": "node node_modules/react-native/local-cli/cli.js start",
    "test": "jest",
    "flow": "node_modules/.bin/flow",
    "start-iphone6": "react-native run-ios --simulator \"iPhone 6 11.3\""
}

4)运行NPM start-iphone6

用于iPhone Xʀ模拟器

    "iosxr": "react-native run-ios --simulator=\"iPhone Xʀ\"",

只需将此添加到您的脚本包。json文件

这里使用的字母“ʀ”和“R”是不同的Unicode。

然后点击$ yarn iosxr在iPhone Xʀ模拟器上启动应用程序

这里是改变iOS模拟器的新路径，你只需要改变

default: 'iPhone 6' or something else 

路径:

<project_root>/node_modules/@react-native-community/cli/build/commands/runIOS/runIOS.js

使用此命令获取设备列表

xcrun simctl list devices

控制台

== Devices ==
-- iOS 13.5 --
    iPhone 6s (9981E5A5-48A8-4B48-B203-1C6E73243E83) (Shutdown) 
    iPhone 8 (FC540A6C-F374-4113-9E71-1291790C8C4C) (Shutting Down) 
    iPhone 8 Plus (CAC37462-D873-4EBB-9D71-7C6D0C915C12) (Shutdown) 
    iPhone 11 (347EFE28-9B41-4C1A-A4C3-D99B49300D8B) (Shutting Down) 
    iPhone 11 Pro (5AE964DC-201C-48C9-BFB5-4506E3A0018F) (Shutdown) 
    iPhone 11 Pro Max (48EE985A-39A6-426C-88A4-AA1E4AFA0133) (Shutdown) 
    iPhone SE (2nd generation) (48B78183-AFD7-4832-A80E-AF70844222BA) (Shutdown) 
    iPad Pro (9.7-inch) (2DEF27C4-6A18-4477-AC7F-FB31CCCB3960) (Shutdown) 
    iPad (7th generation) (36A4AF6B-1232-4BCB-B74F-226E025225E4) (Shutdown) 
    iPad Pro (11-inch) (2nd generation) (79391BD7-0E55-44C8-B1F9-AF92A1D57274) (Shutdown) 
    iPad Pro (12.9-inch) (4th generation) (ED90A31F-6B20-4A6B-9EE9-CF22C01E8793) (Shutdown) 
    iPad Air (3rd generation) (41AD1CF7-CB0D-4F18-AB1E-6F8B6261AD33) (Shutdown) 
-- tvOS 13.4 --
    Apple TV 4K (51925935-97F4-4242-902F-041F34A66B82) (Shutdown) 
-- watchOS 6.2 --
    Apple Watch Series 5 - 40mm (7C50F2E9-A52B-4E0D-8B81-A811FE995502) (Shutdown) 
    Apple Watch Series 5 - 44mm (F7D8C256-DC9F-4FDC-8E65-63275C222B87) (Shutdown) 

这里以不带ID的选择模拟器字符串为例。

iPad Pro(12.9英寸)(第四代)

最后的命令

iPhone

•iPhone 6s

react-native run-ios --simulator="iPhone 6s"

• 苹果手机 8

react-native run-ios --simulator="iPhone 8"

•iPhone 8 Plus

react-native run-ios --simulator="iPhone 8 Plus"

• 苹果手机 11

react-native run-ios --simulator="iPhone 11"

• 苹果手机 11 专业版

react-native run-ios --simulator="iPhone 11 Pro"

• iPhone 11 Pro Max

react-native run-ios --simulator="iPhone 11 Pro Max"

•iPhone SE(第二代)

react-native run-ios --simulator="iPhone SE (2nd generation)"

iPad

• iPad Pro（9.7 英寸）

react-native run-ios --simulator="iPad Pro (9.7-inch)"

•iPad(第7代)

react-native run-ios --simulator="iPad (7th generation)"

•iPad Pro(11英寸)(第二代)

react-native run-ios --simulator="iPad Pro (11-inch) (2nd generation)"

•第四代iPad Pro(12.9英寸)

react-native run-ios --simulator="iPad Pro (12.9-inch) (4th generation)"

•iPad Air(第三代)

react-native run-ios --simulator="iPad Air (3rd generation)"

使用——simulator标志指定一个模拟器。

以下是iOS 14.0之后可用的设备:

npx react-native run-ios --simulator="iPhone 8"
npx react-native run-ios --simulator="iPhone 8 Plus"
npx react-native run-ios --simulator="iPhone 11"
npx react-native run-ios --simulator="iPhone 11 Pro"
npx react-native run-ios --simulator="iPhone 11 Pro Max"
npx react-native run-ios --simulator="iPhone SE (2nd generation)"
npx react-native run-ios --simulator="iPhone 12 mini"
npx react-native run-ios --simulator="iPhone 12"
npx react-native run-ios --simulator="iPhone 12 Pro"
npx react-native run-ios --simulator="iPhone 12 Pro Max"
npx react-native run-ios --simulator="iPhone 13 Pro"
npx react-native run-ios --simulator="iPhone 13 Pro Max"
npx react-native run-ios --simulator="iPhone 13 mini"
npx react-native run-ios --simulator="iPhone 13"
npx react-native run-ios --simulator="iPod touch (7th generation)"
npx react-native run-ios --simulator="iPad Pro (9.7-inch)"
npx react-native run-ios --simulator="iPad (9th generation)"
npx react-native run-ios --simulator="iPad Air (4th generation)"
npx react-native run-ios --simulator="iPad Pro (11-inch) (3rd generation)"
npx react-native run-ios --simulator="iPad Pro (12.9-inch) (5th generation)"
npx react-native run-ios --simulator="iPad mini (6th generation)"

列出所有可用的iOS设备:

xcrun simctl list devices

目前没有办法设置默认值。

React Native Docs:在模拟器上运行

正如Ian L所回答的，我也使用NPM来管理我的脚本。

例子: { "脚本":{ “ios”:“react-native run-ios——模拟器=\"iPad Air 2\""， “设备”:“xcrun simctl list设备” ｝ ｝

这样，我可以很快得到我需要的东西:

列出所有设备:npm run devices 运行默认模拟器:npm Run ios