Sets the contents of this document by reading from a file wrapper of a specified type.
- macOS 10.4+
The file wrapper from which the document contents are read.
The string that identifies the document type.
On return, if the document contents could not be read, a pointer to an error object that encapsulates the reason they could not be read.
YES if the document contents could be read; otherwise,
The default implementation of this method invokes
For backward binary compatibility with OS X v10.3 and earlier, the default implementation of this method instead invokes
[self load if
load is overridden.