swift - 类型 'OSType' 不符合 Swift 2.0 中的协议(protocol) 'AnyObject'

Question

我刚刚使用 Swift 2.0 更新到 Xcode 7 beta。当我将我的项目更新到 Swift 2.0 时，我收到了这个错误:“Type 'OSType' does not conform to protocol 'AnyObject' in Swift 2.0”。我的项目在 Swift 1.2 中完美运行。这是代码出错的地方:

videoDataOutput = AVCaptureVideoDataOutput()
        // create a queue to run the capture on
        var captureQueue=dispatch_queue_create("catpureQueue", nil);
        videoDataOutput?.setSampleBufferDelegate(self, queue: captureQueue)

        // configure the pixel format            
        **videoDataOutput?.videoSettings = [kCVPixelBufferPixelFormatTypeKey: kCVPixelFormatType_32BGRA]** // ERROR here!

        if captureSession!.canAddOutput(videoDataOutput) {
            captureSession!.addOutput(videoDataOutput)
        }

我尝试将 kCVPixelFormatType_32BGRA 转换为 AnyObject，但没有成功。任何人都可以帮助我吗？对不起，我的英语不好!谢谢!

Answer 1

这是 Swift 1.2 中的 kCVPixelFormatType_32BGRA 定义:

var kCVPixelFormatType_32BGRA: Int { get } /* 32 bit BGRA */

这是它在 Swift 2.0 中的定义:

var kCVPixelFormatType_32BGRA: OSType { get } /* 32 bit BGRA */

实际上 OSType 是一个 UInt32，它不能隐式转换为 NSNumber:

When you write let ao: AnyObject = Int(1), it isn’t really putting an Int into an AnyObject. Instead, it’s implicitly converting your Int into an NSNumber, which is a class, and then putting that in.

https://stackoverflow.com/a/28920350/907422

那么试试这个:

videoDataOutput?.videoSettings = [kCVPixelBufferPixelFormatTypeKey: Int(kCVPixelFormatType_32BGRA)]

或

videoDataOutput?.videoSettings = [kCVPixelBufferPixelFormatTypeKey: NSNumber(unsignedInt: kCVPixelFormatType_32BGRA)