The data currently available in the receiver.
- iOS 2.0+
- macOS 10.0+
- tvOS 9.0+
- watchOS 2.0+
The data currently available through the receiver, up to the the maximum size that can be represented by an
If the receiver is a file, this method returns the data obtained by reading the file from the current file pointer to the end of the file. If the receiver is a communications channel, this method reads up to a buffer of data and returns it; if no data is available, the method blocks. Returns an empty data object if the end of file is reached. This method raises
NSFile if attempts to determine the file-handle type fail or if attempts to read from the file or channel fail.