Question

您好我正在编写一个相机应用程序，当您按下照片按钮而不显示照片时，照片将被保存到相机中。我差不多完成了，但我遇到了一段代码应该与swift一起工作的问题，但是不能使用swift 2。

  func didTakePhoto() {
    if let videoConection = stillImageOutput2?.connectionWithMediaType(AVMediaTypeVideo){
        videoConection.videoOrientation = AVCaptureVideoOrientation.Portrait
        stillImageOutput2?.captureStillImageAsynchronouslyFromConnection(videoConection, completionHandler: { (sampleBuffer, ErrorType) -> Void in
            if sampleBuffer != nil {
                let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer)
                let dataProvider = CGDataProviderCreateWithCFData(imageData)
                let cgImageRef = CGImageCreateWithJPEGDataProvider(dataProvider, nil, true, .RenderingIntentDefault)

                var savedImage = UIImage(CGImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.Right)

            }
        })
    }
}

@IBAction func takePhotoBtn(sender: UIButton) {
    didTakePhoto()
    UIImageWriteToSavedPhotosAlbum(savedImage, nil, nil, nil)
}

当我尝试使用我刚刚在保存它的函数中创建的图像时，它不起作用。我该如何解决这个问题？

Answer 1

您的代码结构如下：

func didTakePhoto() {
     // ...
     var savedImage = UIImage(CGImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.Right)
}
@IBAction func takePhotoBtn(sender: UIButton) {
    didTakePhoto()
    UIImageWriteToSavedPhotosAlbum(savedImage, nil, nil, nil)
}

所以savedImage在本地声明，因此完全局限于didTakePhoto()的世界。在takePhotoBtn的世界中，不存在savedImage - 因此您会遇到编译器错误。

你有两个选择。您可以在两个方法都能看到的更高级别声明savedImage：

var savedImage:UIImage!
func didTakePhoto() {
     // ...
     savedImage = UIImage(CGImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.Right)
}
@IBAction func takePhotoBtn(sender: UIButton) {
    didTakePhoto()
    UIImageWriteToSavedPhotosAlbum(savedImage, nil, nil, nil)
}

或者，您可以didTakePhoto 返回 savedImage作为结果：

func didTakePhoto() -> UIImage {
     // ...
     let savedImage = UIImage(CGImage: cgImageRef!, scale: 1.0, orientation: UIImageOrientation.Right)
     return savedImage
}
@IBAction func takePhotoBtn(sender: UIButton) {
    UIImageWriteToSavedPhotosAlbum(didTakePhoto(), nil, nil, nil)
}

Answer 2

我在我的项目中使用此代码段：

func saveImage(image: UIImage) 
   let destinationPath = documentsPath.stringByAppendingPathComponent("test.png")
   UIImagePNGRepresentation(rotateImage(image))!.writeToFile(destinationPath, atomically: true)

 }


func rotateImage(image: UIImage) -> UIImage {
    print(image.imageOrientation.hashValue )
    if (image.imageOrientation == UIImageOrientation.Up ) {

        return image //UIImage(CGImage: image, scale: 0.5, orientation: UIImageOrientation.Up)
    }

    UIGraphicsBeginImageContext(image.size)

    image.drawInRect(CGRect(origin: CGPoint.zero, size: image.size))
    let copy = UIGraphicsGetImageFromCurrentImageContext()

    UIGraphicsEndImageContext()
    return copy
}

如何设置图像以便我可以将其保存在swift 2中

2 个答案: