我需要在后台将视频发布到服务器。到目前为止，我在发布时一直使用这种模式:-(BOOL)loginUser:(user*)user{BOOLret=NO;AppDelegate*appDelegate=(AppDelegate*)[[UIApplicationsharedApplication]delegate];[appDelegate.waitViewstartWithMessage:@"Signingin..."];[self.objectManagerpostObject:userusingBlock:^(RKObjectLoader*loader){loader.delegat

placesClient给出了持有nil值的错误，在阅读了googleplaces文档后我读到了这个声明:Thisclassshouldbeaccessedthroughthe[GMSPlacesClientsharedClient]method.我想知道如何实现sharedClient方法以便根据placesID搜索给定地点的信息？varplacesClient:GMSPlacesClient!funclookUpPlaceID(){letplaceID="ChIJPXw5JDZM6IAR4rTXaFQDGys"//WhatvalueshouldplacesClientbeholdi