Can't bridge NSData and UIImage to Blob according to Documentation in Swift3

[Stanley-Tian]

The docs below seems outdated, any idea to make it work in swift 3 ?

extension NSData: Value {
    class var declaredDatatype: String {
        return Blob.declaredDatatype
    }
    class func fromDatatypeValue(blobValue: Blob) -> Self {
        return self(bytes: blobValue.bytes, length: blobValue.bytes.count)
    }
    var datatypeValue: Blob {
        return Blob(bytes: bytes, length: length)
    }
}

// assumes NSData conformance, above
extension UIImage: Value {
    public class var declaredDatatype: String {
        return Blob.declaredDatatype
    }
    public class func fromDatatypeValue(blobValue: Blob) -> UIImage {
        return UIImage(data: NSData.fromDatatypeValue(blobValue))!
    }
    public var datatypeValue: Blob {
        return UIImagePNGRepresentation(self)!.datatypeValue
    }

}

[jberkel]

6152ee3

[Stanley-Tian]

@jberkel Sadly still not working, Here is what I got after I paste the code into my project

extension Data: Value { // error: Redundant conformance of 'Data' to protocol 'Value'
    class var declaredDatatype: String { // error: Class properties are only allowed within classes; use 'static' to declare a static property
        return Blob.declaredDatatype
    }
    class func fromDatatypeValue(blobValue: Blob) -> Self { // error: Class methods are only allowed within classes; use 'static' to declare a static method
        return self(bytes: blobValue.bytes, length: blobValue.length)
    }
    var datatypeValue: Blob {
        return Blob(bytes: bytes, length: length)// error: Struct method cannot return 'Self'; did you mean to use the struct type 'Data'?
    }
}

extension UIImage: Value {
    public class var declaredDatatype: String {
        return Blob.declaredDatatype
    }
    public class func fromDatatypeValue(blobValue: Blob) -> UIImage { // error: Method 'fromDatatypeValue(blobValue:)' has different argument names from those required by protocol 'Value' ('fromDatatypeValue')
        return UIImage(data: Data.fromDatatypeValue(blobValue))!
    }
    public var datatypeValue: Blob {
        return UIImagePNGRepresentation(self)!.datatypeValue
    }

}

After trying all "Fix-it" and replace blobValue.length to blobValue.bytes.count I still got this error

extension Data: Value { **// error: Redundant conformance of 'Data' to protocol 'Value'**
    static var declaredDatatype: String {
        return Blob.declaredDatatype
    }
    static func fromDatatypeValue(blobValue: Blob) -> Data {
        return self(bytes: blobValue.bytes, length: blobValue.bytes.count) **// error:  Cannot invoke 'self' with an argument list of type '(bytes: [UInt8], length: Int)'**
    }
    var datatypeValue: Blob {
        return Blob(bytes: bytes, length: count) **// error: 'bytes' is unavailable: use withUnsafeBytes instead**
    }
}

extension UIImage: Value {
    public class var declaredDatatype: String {
        return Blob.declaredDatatype
    }
    public class func fromDatatypeValue(_ blobValue: Blob) -> UIImage {
        return UIImage(data: Data.fromDatatypeValue(blobValue))!
    }
    public var datatypeValue: Blob {
        return UIImagePNGRepresentation(self)!.datatypeValue
    }

}

[jberkel]

@Stanley-Tian ok, i'll have a look and double check. I think the first extension might not be required anymore.

[Stanley-Tian]

@jberkel thanks! Seems the second extension is working !