找到设备的相机分辨率iOS的方法

问题描述

使用设置 AVCaptureSessionPresetPhoto 找到要捕获的图像分辨率的最佳方法。

我想在捕获之前找到分辨率图片。

Whats the best method to find the image resolution going to be captured using setting AVCaptureSessionPresetPhoto.
I am trying to find the resolution before capturing the image.

推荐答案

使用下面的函数，您可以通过编程方式从 activeFormat 在捕获开始之前，但不是在添加输入和输出之前：


With the function below, you can programmatically get the resolution from activeFormat before capture begins, though not before adding inputs and outputs:https://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVCaptureDevice_Class/index.html#//apple_ref/occ/instp/AVCaptureDevice/activeFormat

private func getCaptureResolution() -> CGSize {
    // Define default resolution
    var resolution = CGSize(width: 0, height: 0)

    // Get cur video device
    let curVideoDevice = useBackCamera ? backCameraDevice : frontCameraDevice

    // Set if video portrait orientation
    let portraitOrientation = orientation == .Portrait || orientation == .PortraitUpsideDown

    // Get video dimensions
    if let formatDescription = curVideoDevice?.activeFormat.formatDescription {
        let dimensions = CMVideoFormatDescriptionGetDimensions(formatDescription)
        resolution = CGSize(width: CGFloat(dimensions.width), height: CGFloat(dimensions.height))
        if (portraitOrientation) {
            resolution = CGSize(width: resolution.height, height: resolution.width)
        }
    }

    // Return resolution
    return resolution
}

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