小编Ole*_*ndr的帖子

在我将Swift 1更新为Swift 2.0后,我遇到了一个问题.

我在这段代码的第一行收到以下错误:

方法不能标记为@objc,因为参数的类型不能在Objective-C中表示

@objc func personsToFirstStep(persons: [Person]) {
    for person in persons {
        if !self.persons.contains(person) && person.id != userID {
            self.persons.append(person)
        }
    }

    collectionView.reloadData()
    collectionViewPlaceholder.hidden = true
    collectionView.hidden = false
    collectionGradientView.hidden = false
} 

这个Person类:

class Person: Hashable {

    var intID: Int = 0
    var id: String = ""
    var name: String = ""
    var type: String = ""

    var hashValue: Int {
        return self.intID
    }

    init(id: String, name: String, type: String) {
        self.id = id
        self.intID = …

struct MyRect : CGRect {...}

是否有可能在swift中继承一个Structure？

我已经在Apple官方网站上找到了一个例子:这个例子扩展了CGRect结构以包含计算区域属性:

extension CGRect {
    var area: CGFloat {
        return width * height
    }
}
let rect = CGRect(x: 0.0, y: 0.0, width: 10.0, height: 50.0)
let area = rect.area

我如何定义结构的子类？

我在 Mac OS 上按了一些东西，现在我不能把所有的窗口放在一起（对接）。在 Windows 操作系统中，我们只需将另一个窗口拖到选项卡空间，我们就有 2 个选项卡。在 Mac OS 中，我们不能这样做。Unity中是否有任何重置？

“CMSampleBufferGetImageBuffer”已被属性“CMSampleBuffer.imageBuffer”替换

CMSampleBufferGet.ImageBuffer 不起作用:) 似乎 Swift 4.2 的参数也发生了变化。

guard let pixelBuffer: CVPixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return }

整个功能。万一 ...

    func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
//        print("Camera was able to capture a frame:", Date())

        guard let pixelBuffer: CVPixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return }
        guard let model = try? VNCoreMLModel(for: ARS().model) else { return }
        let request = VNCoreMLRequest(model: model) { (finishedReq, err) in

            guard let results = finishedReq.results as? [VNClassificationObservation] else { return } …

Swift 3.0来自at处有错误 Swift 5.0

代码：

//Create audio file name URL
let audioFilename = getDocumentsDirectory().appendingPathComponent("audioRecording.m4a")

//Create the audio recording, and assign ourselves as the delegate
audioRecorder = try AVAudioRecorder(url: audioFilename, settings: settings)

我认为它应该是这样的：

   func getDocumentsDirectory() -> URL
    {
        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
        let documentsDirectory = paths[0]
        return documentsDirectory
    }

这是对的吗？或不？