init(source:injectionTime:forMainFrameOnly:inContentWorld:)
Declaration
init(source: String, injectionTime: WKUserScriptInjectionTime, forMainFrameOnly: Bool, inContentWorld contentWorld: WKContentWorld)init(source: String, injectionTime: WKUserScriptInjectionTime, forMainFrameOnly: Bool, inContentWorld contentWorld: WKContentWorld)