ios - 访问 nsmutablearray xcode 中的图像

Question

我正在将单个图像转换为 UIImagePNGRepresentation，但我不断收到线程断点 ate let data = UIImagePNGRepresentation(tile as! UIImage)! ImageNameList 是一个 nsmutable 图像数组

var imageNameList: [String] {
    var imageNameList2:[String] = [] //[NSMutableArray]()
    for i in 0...149 {
        let imageName = String(format: "pic_%03d", Int(i))
        imageNameList2.append(imageName)
    }
    return imageNameList2
}

let table = PFObject(className: "Cool")
        let tilesPF = imageNameList.map({ tile in
            let data = UIImagePNGRepresentation(tile)! //cannot convert type string to type uiimage
            let file = PFFile(data: data)

            let tile = PFObject(className: "RealCool")
            tile["tile"] = file
        })

Answer 1

UIImage不是 PFObject 的子类，所以 Actor tile as! UIImage永远不可能成功。 Swift 编译器应该已经向您发出警告:“从 'PFObject' 转换为不相关类型 'UIImage' 总是失败”。