On Jan 23, 2012, at 5:17 AM, Ken Thomases wrote:
On Jan 22, 2012, at 1:24 PM, Jan E. Schotsman wrote:
Suppose I want to display a modeless choose file dialog with the
beginWithCompletionHandler method.
How can I pass some context info to the handler?
Blocks capture whatever local variables you reference within them.
If you reference instance variables, they capture "self" and then
access the ivars from that. Just use whatever value you want,
directly. That's the great thing about blocks.
That's great indeed, but I need the block to work with a method
parameter (an NSString object). Do I need to copy the NSString to an
ivar?
-method:(NSString *)someString
{
(void)(^handler)(NSInteger result) = { <uses someString > };
[openPanel beginWithCompletionHandler: handler];
}
I have a related question for the old beginForDirectory method:
if I try to pass on someString in a C struct (contextInfo) then the
compiler complains that ARC doesn't like object pointers in C structs.
I could serialize and unserialize the string. Or is there a better way?
Jan E.
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