Recent questions tagged swift4

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swift4 - How can I use Swift’s Codable to encode into a dictionary?

I have a struct that implements Swift 4's Codable. Is there a simple built-in way to encode that struct into a dictionary? let ... now dict is ["a": 1, "b": 2] Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift4 - Using Decodable in Swift 4 with Inheritance

Should the use of class inheritance break the Decodability of class. For example, the following code class Server : ... can't express Codable in both classes. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift4 - How do I write dispatch_after GCD in Swift 3, 4, and 5?

In Swift 2, I was able to use dispatch_after to delay an action using grand central dispatch: var dispatchTime: ... preferred way to write this in modern Swift? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift4 - The use of Swift 3 @objc inference in Swift 4 mode is deprecated?

Briefly, while using Xcode 9 Beta, I have run into the following warning: The use of Swift 3 @objc ... understanding of what is happening with my code. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift4 - How can I use String substring in Swift 4? 'substring(to:)' is deprecated: Please use String slicing subscript with a 'partial range from' operator

I have the following simple code written in Swift 3: let str = "Hello, playground" let index = str.index(of: ... with partial range from be used in Swift 4? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift4 - Unable to Extract Data from the Dictionary<String, Any> in swift

I have a Dictionary<String, Any> Data in the following format. I need to extract the values from it.I am ... /65944473/unable-to-extract-data-from-the-dictionarystring-any-in-swift...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift4 ，如何获取UIImage 图片的大小？

swift 获取UIimage 图片大小 **let** data: Data = UIImageJPEGRepresentation(image!,0.5)! **let** imageSize: Float = Float(data.count/1024) print("图片原 ... ) kb") 这个方法好像有问题输入 1 输入 0.5 都不准...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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swift4 ，如何获取UIImage 图片的大小？

swift 获取UIimage 图片大小 **let** data: Data = UIImageJPEGRepresentation(image!,0.5)! **let** imageSize: Float = Float(data.count/1024) print("图片原 ... ) kb") 这个方法好像有问题输入 1 输入 0.5 都不准...

asked Jan 27, 2021 in Technique[技术] by 深蓝 (71.8m points)

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