要将OBJ或DAE文件转换为ARObject，可以使用以下代码示例：

import ARKit

func convertToARObject(objFile: String, mtlFile: String) -> ARReferenceObject? {
    guard let objURL = Bundle.main.url(forResource: objFile, withExtension: "obj") else {
        print("Error: Unable to find OBJ file.")
        return nil
    }
    
    guard let mtlURL = Bundle.main.url(forResource: mtlFile, withExtension: "mtl") else {
        print("Error: Unable to find MTL file.")
        return nil
    }
    
    let asset = MDLAsset(url: objURL)
    asset.loadTextures()
    
    let object = asset.object(at: 0)
    let referenceObject = try! ARReferenceObject(object: object, url: objURL, mtl: mtlURL)
    
    return referenceObject
}

// Usage:
if let arObject = convertToARObject(objFile: "myObject", mtlFile: "myMaterial") {
    // Use the AR object
    // For example, you can add it to an ARWorldMap or use it for object detection.
    // See ARKit documentation for more details.
}

请确保将OBJ和MTL文件添加到项目中，并将其命名为myObject.obj和myMaterial.mtl（或者根据需要更改文件名）。此外，还要确保正确导入ARKit框架。