Swift - 转换AutoreleasingUnsafeMutablePointer<AnyObject?>值

Question

Swift - 转换AutoreleasingUnsafeMutablePointer<AnyObject?>值

11

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 {

}

我现在想把thumbnailDictionary转换成字典或NSDictionary。这是我在Objective-C中的做法：

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

我真的无法想出如何在Swift中做到这一点。求助？

- arcticmatt

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- arcticmatt · Accepted Answer

收到了。传递AutoreleasingUnsafeMutablePointer是不必要的。

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