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27 lines
1.0 KiB
C
27 lines
1.0 KiB
C
8 years ago
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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NS_ASSUME_NONNULL_BEGIN
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@interface NSItemProvider (OWS)
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// NSItemProvider.loadItem(forTypeIdentifier:...) is unsafe to call from Swift,
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// since it can yield values of arbitrary type. It has a highly unusual design
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// in which its behavior depends on the _type_ of the completion handler.
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// loadItem(forTypeIdentifier:...) tries to satisfy the expected type of the
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// completion handler. This "hinting" only works in Objective-C. In Swift,
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// The type of the completion handler must agree with the param type.
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//
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// Therefore we use an Objective-C category to hint to NSItemProvider that we
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// prefer an instance of NSData.
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//
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// See: https://developer.apple.com/documentation/foundation/nsitemprovider/1403900-loaditemfortypeidentifier
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- (void)loadDataForTypeIdentifier:(NSString *)typeIdentifier
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options:(nullable NSDictionary *)options
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completionHandler:(nullable NSItemProviderCompletionHandler)completionHandler;
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@end
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NS_ASSUME_NONNULL_END
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