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Presenting VCs as Sheets — Completion Handler?
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Presenting VCs as Sheets — Completion Handler?


  • Subject: Presenting VCs as Sheets — Completion Handler?
  • From: Seth Willits <email@hidden>
  • Date: Mon, 24 Aug 2015 18:56:38 -0700

Naturally we're all accustomed to the pattern:

[sheet beginSheetModalForWindow:window completionHandler:^(NSInteger response){
	...
}];



But with the new "presentation" API, there's no built-in mechanism for handling the sheet being closed. To have a similar pattern as before would require:


otherVC.completionHandler = ^(NSInteger response){
	...
};
[someVC presentViewControllerAsSheet:otherVC];



@implementation OtherViewController

// @property void (^completionHandler)(NSInteger response);

- (IBAction)ok:(id)sender
{
	[self dismissController:nil];
	if (self.completionHandler) {
		self.completionHandler(NSOKButton);
		self.completionHandler = nil; // Gotta kill the likely circular reference.
	}
}

....

@end




No doubt it's flexible, but it's a bit verbose. I just want to double-check I didn't miss some other pattern we're supposed to be using.



--
Seth Willits




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