相关疑难解决方法(0)

这怎么可能？

let exists = NSFileManager.defaultManager().fileExistsAtPath(path.absoluteString)
print("exists: \(exists)") //false

这是 path.absoluteString

//file:///Users/kuna/Library/Developer/CoreSimulator/Devices/92BD140D-5C14-43C4-80D6-904BB9594ED6/data/Containers/Data/Application/5B818832-BB19-4047-A7F8-1487F36868D6/Documents/wishlists/68/147/128/IMG_0006.PNG

你可以看到它应该在哪里:

到底是怎么回事？

我正在尝试在缓存目录中保存带有覆盖的地图快照,并在存在时检索它.但是,尽管创建了文件,但当我尝试检索它时,UIImage(contentsOfFile :)返回nil.我已经打印了写入和读取的文件路径,它们是相同的,并通过下载容器并检查目录并且文件确实存在来验证文件是否存在.

知道这里的问题是什么吗？

let cachesDirectory: URL = {
    let urls = FileManager.default.urls(for: .cachesDirectory, in: .userDomainMask)
    return urls[urls.endIndex - 1]
}()

let mapCachesDirectory = cachesDirectory.appendingPathComponent("map-snapshots", isDirectory: true)

func configureMap(data: NSSet?) {
    mapView.isZoomEnabled = false
    mapView.isScrollEnabled = false
    mapView.isUserInteractionEnabled = false

    guard let data = data as? Set<SessionData>, data.count > 0 else { return }

    activityIndicatorView.isHidden = false
    activityIndicatorView.startAnimating()

    DispatchQueue.global(qos: .userInitiated).async {
        var points = [CLLocationCoordinate2D]()
        for object in data {
            guard object.locationLatitude != 0, object.locationLatitude != 0 else { continue } …