- WWDC 2016 统一日志和活动追踪
- 日志可以在 Console.app 中查看
- 配置
OSLog - 将
Logger.Level的日志级别映射到OSLogType - 自定义元数据格式化器
将依赖项添加到 Package.swift...
.package(url: "https://github.com/Alexander-Ignition/OSLogging", from: "1.0.0"),
... 以及你的目标
.target(name: "ExampleApp", dependencies: ["OSLogging"]),
使用默认 OSLog 重写 LoggingSystem。
LoggingSystem.bootstrap { _ in OSLogHandler() }
let logger = Logger(label: "com.example.app")
logger.info("i found you!")
// 2019-10-20 08:47:35.498086+0300 ExampleApp[6533:150683] i found you!
为应用程序的不同部分选择子系统和类别
let logger = Logger(label: "com.exaple.app") { label in
OSLogHandler(subsystem: label, category: "auth")
}
logger.info("loose control")
// 2019-10-20 08:47:35.498582+0300 ExampleApp[6533:150683] [auth] loose control
自定义元数据格式
var logger = Logger(label: "com.exaple.app") { label in
var hanlder = OSLogHandler(subsystem: label, category: "session")
hanlder.formatter = { metadata in
metadata.map { "\($0):\($1)" } .joined(separator: ", ")
}
return hanlder
}
logger[metadataKey: "request-id"] = "1"
logger[metadataKey: "session-id"] = "a"
logger.warning("catch me if you can")
// 2019-10-20 08:47:35.499106+0300 ExampleApp[6533:150683] [session] session-id:a, request-id:1 catch me now