KVO的监听与移除

[sunshineLixun]

Hello! 最近在看您写的MVCS框架 ，KVO模块有个地方不太理解：
[info.observedObject removeObserver:info.observingObject forKeyPath:info.keyPath]; 既然已经移除了kvo 。那下面这段代码看着不是很懂：

        NSObject *otherObject = nil;
        if (info.observedObject != registeredObject) {
            otherObject = info.observedObject;
        } else if (info.observingObject != registeredObject) {
            otherObject = info.observingObject;
        }
        
        NSMutableArray *infosForOtherObject = [otherObject mi_associatedObjectForKey:kMIKVOInfoKey];
        [infosForOtherObject removeObject:info];