AdAssetDelegate
@objc(AASDKAdAssetDelegate)
public protocol AdAssetDelegateInforms its delegate of AdAsset networking events. Optional.
Can be used to track the status of an AdAsset during buffering / pre-caching, if available.
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                  Called when the asset data is fully downloaded. DeclarationSwift @objc optional func adAssetDidFinishDownloadingData(_ asset: AdAsset)Parametersassetasset owner 
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                  Called when a new slice of data has been downloaded for the asset. Progress can be calculated as a 0…1 range e.g bytesDownloaded/bytesExpectedDeclarationSwift @objc optional func adAsset(_ asset: AdAsset, didDownloadDataWith bytesDownloaded: Int64, outOf bytesExpected: Int64)Parametersassetasset owner bytesDownloadeddownloaded data progress so far, in bytes bytesExpectedexpected data to download, in bytes 
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                  Called when an error was encountered during data download for the asset. DeclarationSwift @objc optional func adAsset(_ asset: AdAsset, downloadingFailedWith error: Error)Parametersassetasset owner errorthe error 
