Swift 中的 Google Anylytics SDK 使用 GAIDictionaryBuilder 引发错误

Question

错误信息是

xxx.swift:171:45: Cannot convert the expression's type 'NSMutableDictionary!' to type 'StringLiteralConvertible'

代码是

GAI.sharedInstance().defaultTracker.send(GAIDictionaryBuilder.createEventWithCategory("Category", action: "action", label: nil, value: nil).build())

谷歌分析 SDK 版本是

pod 'GoogleAnalytics-iOS-SDK', '3.0.9'