ios - 在 Swift 2 中，如何将 JSON 数组转换为 [Int32]

Question

我有以下代码读取 JSON 文件，然后将其数组转换为 [Float32] 或 [Int32]

let location = NSString(string:"/Users/myname/Documents/test.js").stringByExpandingTildeInPath
let rawData = NSData(contentsOfFile: location)
let modelData = try? NSJSONSerialization.JSONObjectWithData(rawData!, options: NSJSONReadingOptions.AllowFragments)

let dict = modelData as! NSDictionary
guard let vertices = dict["vertices"] as? [Float32] else {
    print("error casting vertices")
    return
}
guard let indices = dict["faces"] as? [Int32] else {
    print("error casting indices")
    return
}

JSON文件的内容是:

{
    "vertices" : [1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9],
    "faces" : [0,1,2]
}

JSON 文件已成功加载和解析，但是，vertices 到 [Float32] 的转换成功，而 faces 的转换[Int32] 失败。有没有办法将 faces 转换为 [Int32]？

Answer 1

只需将其转换为 [Int] 而不是 [Int32]。您可以像这样检查类型

dict["faces"] is [Int]