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Swift 学习笔记 (六)

19 February 2019

by aiQG_

- as! 转换失败时会报运行错误
```swift
//基类转换为派生类
class Base{}
class Son: Base{}
let base: Base = Son()
let son = base as! Son

关于UIImageWriteToSavedPhotosAlbum函数的参数: 参考资料

Swift

return

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