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ios - 如何在 Swift 3 中使用 unsafeDowncast

我目前正在将一个fork的框架升级到Swift3。publicconvenienceinit(object:Object,keyPath:String,options:NSKeyValueObservingOptions=[],block:@escaping(_object:Object,_change:Change,_kvo:KVObserver)->Void){self.init(__object:object,keyPath:keyPath,options:options,block:{(object,change,kvo)inblock(unsafeDowncast(objec