嘗試拍攝照片時通過的無效/無效連接

我嘗試使用自定義視圖拍攝照片（不使用UIImagePickerController），但每當我嘗試拍攝照片時，應用程序都會崩潰並引發此錯誤：嘗試拍攝照片時通過的無效/無效連接

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[AVCaptureStillImageOutput captureStillImageAsynchronouslyFromConnection:completionHandler:] - inactive/invalid connection passed.'

這是我的takePhoto()功能，這將導致錯誤：

func takePhoto(sender: UIButton!){ 
    var still: AVCaptureStillImageOutput = AVCaptureStillImageOutput() 
    var connection: AVCaptureConnection = AVCaptureConnection(inputPorts: self.input.ports, output: still) 

    if(connection.enabled){ 
     still.captureStillImageAsynchronouslyFromConnection(connection, completionHandler: {(buffer: CMSampleBuffer!, error: NSError!) -> Void in 
      println("picture taken")//this never gets executed 
     }) 
    } 
}

我也試過在takePhoto()功能設置connection變量：

self.output.connections[0] as AVCaptureConnection

以及

(self.session.outputs[0] as AVCaptureOutput).connections[0] as AVCaptureConnection

，我也得到了相同的結果。

在同一視圖作爲取照片按鈕，也有攝像頭的實時預覽（工作）：

func setupCamera(){ 
    self.session = AVCaptureSession() 
    self.session.sessionPreset = AVCaptureSessionPreset640x480 
    self.session.beginConfiguration() 
    self.session.commitConfiguration() 

    var error: NSError? 

    var devices: [AVCaptureDevice] = AVCaptureDevice.devices() as [AVCaptureDevice] 
    for device in devices{ 
     if(device.hasMediaType(AVMediaTypeVideo) && device.supportsAVCaptureSessionPreset(AVCaptureSessionPreset640x480)){ 

      //the input variable is initialized here 

      self.input = AVCaptureDeviceInput.deviceInputWithDevice(device as AVCaptureDevice, error: &error) as AVCaptureDeviceInput 

      if(self.session.canAddInput(self.input)){ 
       self.session.addInput(self.input) 
       break 
      } 
     } 
    } 

    var settings = [kCVPixelBufferPixelFormatTypeKey:kCVPixelFormatType_32BGRA] 

    //the output variable is initialized here 

    self.output = AVCaptureVideoDataOutput() 
    self.output.videoSettings = settings 
    self.output.alwaysDiscardsLateVideoFrames = true 

    if(self.session.canAddOutput(self.output)){ 
     self.session.addOutput(self.output) 
    } 

    var captureLayer = AVCaptureVideoPreviewLayer(session: self.session) 
    captureLayer.frame = CGRectMake(0, 64, self.view.frame.width, (self.view.frame.width * 4)/3) 
    self.view.layer.addSublayer(captureLayer) 

    self.session.startRunning() 
}

我在我的iPhone 5S測試這一點，一切正常，包括預覽功能在內的takePhoto()功能除外。

有沒有辦法做到這一點，或者我必須使用UIImagePickerController？

來源

2015-02-05 Jojodmo

設置相機時，請將stillImageOutput添加到AVCaptureSession。

self.stillImageOutput = AVCaptureStillImageOutput() 
let stillSettings = [AVVideoCodecJPEG:AVVideoCodecKey] 
self.stillImageOutput.outputSettings = stillSettings 

if(self.session.canAddOutput(self.stillImageOutput)){ 
    self.session.addOutput(self.stillImageOutput) 
}

然後拍照時，從stillImageOutput中獲取AVCaptureSession。

func takePhoto(sender: UIButton!){ 
    let connection = self.stillImageOutput.connectionWithMediaType(AVMediaTypeVideo) 

    if(connection.enabled){ 
     self.stillImageOutput.captureStillImageAsynchronouslyFromConnection(connection, completionHandler: {(buffer: CMSampleBuffer!, error: NSError!) -> Void in 
      println("picture taken") // Now, this is executed 
     }) 
    } 
}

來源

2015-02-08 04:41:22 gabbler

誰伸手從crashlytics什麼這個問題無法重現：

用戶拒絕訪問攝像機。檢查相機許可是否被授予。我得到了生產崩潰，結果是這種情況。

來源

2018-02-19 05:28:26

嘗試拍攝照片時通過的無效/無效連接

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