Type Casting Sample Code And Issues

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Type Casting Sample Code
https://github.com/xiruanliuwei/SwiftCodes/commit/ae24daedea3b4e695749c00acbe71e8b24dc518d

1. "as?" returns "optional form"
2. What is optional binding?
原文链接:https://www.f2er.com/swift/321853.html

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