iOS&Swift&OC 闭包和Block的相互转化

一、Swift的闭包 -> OC的block

   将closure类型转化为block类型（Swift的闭包 -> OC的block）
    let closure = {
        (str: String)->Void in

    }
    let block = closure as @convention(block) (String) -> Void
    let blockObject = unsafeBitCast(block, to: AnyObject.self)
    转化完毕blockObject就是一个block了，就可以在OC中正常使用了，也可以放入params中传递了
    let params = ["callback":blockObject] as [AnyHashable:Any]

二、OC的block -> Swift的闭包

    将block转化为closure类型（OC的block -> Swift的闭包）
    callblock是OC的带一个字符串参数的block
    let testBlock = actionParams["callblock"]
    typealias ClosureType = @convention(block) (String) -> Void
    let blockPtr = UnsafeRawPointer(Unmanaged<AnyObject>.passUnretained(testBlock as AnyObject).toOpaque())
    let closure = unsafeBitCast(blockPtr, to: ClosureType.self)

    closure就是转化过后的闭包
    closure("测试")

文章部分内容借鉴链接：(https://www.jianshu.com/p/cd822c503e69)

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