Love UIStoryboard? Love UIStoryboardSegue even more? Hate the way the don't work as closely together as they could do? Try JCSegueUserInfo.

Imagine the common pattern where you'd like to trigger a storyboard segue programatically, but would also like to set a few properties on the destination view controller. Currently, you'd have to do something like this:

...
    self.temporaryProperty = @"foo";
    self.anotherTemporaryProperty = @(1);
    [self performSegueWithIdentifier:@"MySegue" sender:self];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqual:@"MySegue"]) {
        SegueViewController *controller = segue.destinationViewController;
        controller.someProperty = self.temporaryProperty;
        controller.anotherProperty = self.anotherTemporaryProperty;   
        self.temporaryProperty = nil;
        self.anotherTemporaryProperty = nil;
    }
}

With JCSegueUserInfo you can do:

[self jc_performSegueWithIdentifier:@"MySegue"
                            sender:self
                          userInfo:@{ @"someProperty" : @"foo",
                                      @"anotherProperty" : @(1) }];

Much better!

-[UIViewController jc_performSegueWithIdentifier:sender:userInfo: accepts an NSDictionary which is used to set arbitrary properties on the destination view controller instance using the standard -[NSDictionary setValuesForKeysWithDictionary:] method. What we do is swizzle the normal -[UIViewController performSegueWithIdentifier:sender:] to allow these values to be set on the destination controller if they have be stored using the category method.

You can also store values to set when the segue is performed in advance, with -jc_setUserInfo:forSegueWithIdentifier:], and -jc_removeUserForSegueWithIdentifier:. These allow you to use this non-programatic segues; set the values when you have them and let UIKit take care of the segue in the normal fashion. Your values will be set on the desintation view controller.

Notes

We swizzle -[UIViewController performSegueWithIdentifier:sender:] in order to deliver this feature. This makes this library problematic with any other that swizzles the same method. Consider yourself warned

Enjoy!

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