解决方法：项目 --> Capabilities --> Background Modes --> Background fetch & Remote notifications --> 选中解决方法：项目 --> Capabilities --> Background Mod
阅读背景：
You've implemented -[ application:didReceiveRemoteNotification:fetchCompletionHandler:], but you still need to add "remote-notification" to the list of your supported UIBackgrou
来源：互联网
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