Flutter entry code, mainly demonstrates how flutter and iOS interact with each other.
Flutter一个超简易的偏新手的入门代码，主要演示了flutter和iOS相互交互的方法。
- MethodChannel sends a request from flutter, calling the iOS method, in the example requesting the remaining battery power
MethodChannel从flutter发出请求，调用iOS的方法，示例里为请求电池剩余电量
- EventChannel flutter starts to monitor after being loaded, sends events from iOS actively, and flutter refreshes the title after receiving the event
EventChannel flutter启动后开始监听，从iOS主动发送事件，flutter接收到事件后刷新标题
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