Swift - 转换AutoreleasingUnsafeMutablePointer <anyobject？>值</anyobject？>

Question

到目前为止，我有这段代码：

var thumbnailErr: NSError?
var thumbnailDictionary: AutoreleasingUnsafeMutablePointer<AnyObject?> = nil
let getItemSucceeded = url.getPromisedItemResourceValue(thumbnailDictionary, forKey: NSURLThumbnailDictionaryKey, error: &thumbnailErr)
if getItemSucceeded {

}

现在我想将thumbnailDictionary转换为Dictionary或NSDictionary。这就是我在Objective-C中的表现：

BOOL thumbnailSucceeded = [urlFromPath getPromisedItemResourceValue:thumbnailDictionary forKey:NSURLThumbnailDictionaryKey error:&thumbnailErr];
if (thumbnailSucceeded) {
    NSDictionary *dict = (__bridge NSDictionary *)(void *)thumbnailDictionary;
}

我不能为我的生活弄清楚如何在Swift中做到这一点。帮助

Answer 1

知道了。无需传入AutoreleasingUnsafeMutablePointer。

var thumbnailErr: NSError?
var thumbnailDictionary: AnyObject?
let getItemSucceeded = url.getPromisedItemResourceValue(&thumbnailDictionary, forKey: NSURLThumbnailDictionaryKey, error: &thumbnailErr)
if getItemSucceeded {
    let dict = thumbnailDictionary as NSDictionary
}