On Nov 26, 2009, at 9:18 AM, Tom Jones wrote:
> I thought I could just create a Global variable but that does not work.
Did you make it a pointer? You can't directly declare instances of any Cocoa
classes, only pointers to them.
So
MyCocoaClass gFoo;
is a syntax error, while
MyCocoaClass *gFoo;
works.
Of course, you need some initialization code that allocates a new object and
assigns it to foo. And you have to be sure that this code will run before
anyone else tries to use gFoo. This can be problematic. Putting this code into
your app delegate's awakeFromNib method is often sufficient, via something like
this:
- (void) awakeFromNib {
gFoo = [[MyCocoaClass alloc] init];
}
Another way is to do the initialization in a class's +initialize method.
—Jens_______________________________________________
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