以编程方式创建 ARReferenceImage

Question

我正在从数据库下载图像并希望将它们用作 ARReferenceImage，而不是手动将它们添加到 Xcode 资产文件夹。

代码

    let image = #imageLiteral(resourceName: "mike")
    let cgImage = image.cgImage

    guard let referenceImages = ARReferenceImage.init(cgImage, orientation: .portrait, physicalWidth: 100) else {
        fatalError("Failed to load image")
    }

错误

对成员的引用不明确 'init(_:orientation:physicalWidth:)'

Answer 1

CGImagePropertyOrientation 不支持 .portrait 请使用以下支持：

public enum CGImagePropertyOrientation : UInt32 {


    case up // 0th row at top,    0th column on left   - default orientation

    case upMirrored // 0th row at top,    0th column on right  - horizontal flip

    case down // 0th row at bottom, 0th column on right  - 180 deg rotation

    case downMirrored // 0th row at bottom, 0th column on left   - vertical flip

    case leftMirrored // 0th row on left,   0th column at top

    case right // 0th row on right,  0th column at top    - 90 deg CW

    case rightMirrored // 0th row on right,  0th column on bottom

    case left // 0th row on left,   0th column at bottom - 90 deg CCW
}

您的代码：

 let referenceImages = ARReferenceImage(cgImage!, orientation: CGImagePropertyOrientation.up, physicalWidth: 100)

或

let referenceImages = ARReferenceImage.init(cgImage!, orientation: CGImagePropertyOrientation.up, physicalWidth: 100)

Answer 2

CGImagePropertyOrientation 没有名为 .portrait.

的成员

根据documentation有.up、.upMirrored、.down、.downMirrored、.leftMirrored、.right , .rightMirrored, .left。如果您在初始化程序中使用其中之一，它应该可以工作。

例如：

let referenceImage = ARReferenceImage(cgImage, orientation: .up, physicalWidth: 100)

以编程方式创建 ARReferenceImage

Create ARReferenceImage programmatically

ios

swift

arkit