iOS处理unrecognized selector

处理unrecognized selector 这个方法 利用runtime 机制当中的消息转发机制

拯救报错三步

1Method resolution

objc+resolveInstanceMethod:+resolveClassMethod:

Message Forwarding

2Fast forwarding

-forwardingTargetForSelector:Runtime nilselfNormal FowardingFastNSInvocation

3Normal forwarding

RuntimenilRuntime-doesNotRecognizeSelector:RuntimeNSInvocation-forwardInvocation: