Swift Playground编译器错误：编译器无法在合理的时间内对该表达式进行类型检查；

问题描述

当我编写在SwiftPlayground上运行的代码时，出现了此编译错误：“编译器无法在合理的时间内对该表达式进行类型检查”

public func toPlaygroundValue() -> PlaygroundValue {
    let dict: [:] = [
        "pitch": .floatingPoint(Double(pitch)),"roll":  .floatingPoint(Double(roll)),"yaw":   .floatingPoint(Double(yaw)),"vgx":   .floatingPoint(Double(vgx)),"vgy":   .floatingPoint(Double(vgy)),"vgz":   .floatingPoint(Double(vgz)),"tof":   .floatingPoint(Double(tof)),"h":     .floatingPoint(Double(h)),"bat":   .integer(bat),"baro":  .floatingPoint(Double(baro)),"time":  .floatingPoint(Double(time)),"agx":   .floatingPoint(Double(agx)),"agy":   .floatingPoint(Double(agy)),"agz":   .floatingPoint(Double(agz)),"marker": PlaygroundValue.dictionary([
            "id":   .integer(marker.id),"x":  .floatingPoint(Double(marker.x)),"y":  .floatingPoint(Double(marker.y)),"z":   .floatingPoint(Double(marker.z)),]),"temp": PlaygroundValue.dictionary([
            "temph":   .integer(temp.temph),"templ":   .integer(temp.templ),"mpry":PlaygroundValue.dictionary([
            "x":  .floatingPoint(Double(mpry.x)),"y":  .floatingPoint(Double(mpry.y)),"z":   .floatingPoint(Double(mpry.z)),"sn": .string(sn),]
    let value: PlaygroundValue = PlaygroundValue.dictionary(dict)
    return value
}

解决方法

为变量提供数据类型可能会有所帮助： 使用let dict：[String：PlaygroundValue] = [...]而不是let dict：[：] = [...]