UIstoryboard：模态选择的“动画”选项在6.0之前的iOS版本上不可用

Question

I'm getting the above warnings using Xcode 5 with a deployment target set to iOS 5.0.

I'm not sure whether to simply ignore these warnings OR find an alternative way of providing this functionality for iOS5.

As far as I can see I have a number of imperfect solutions:

Option 1: present the MainStoryboard programmatically for iOS6+; replace modal segues on a different storyboard for iOS5 with

presentViewController:animated:completion:

Option2: would be to drop modal segues entirely from the storyboard(s), calling any segues within IBAction methods

Option3: ignore the warnings (would the app still be accepted?).

(Yes, I'm aware of "target iOS6+ only" as an option)

I'd appreciate advice from those who've found ways to solve this problem.

Update: solved this thanks to Mikael's answer below: I subclassed UIStoryboardSegue as below

#import "StandardModalSegue.h"

@implementation StandardModalSegue
- (void) perform {
    //my conditional version of NSLog()
    myLog(kLogVC, 2, @"%@ to %@",self.sourceViewController ,self.destinationViewController);
    //iOS5 replacement for presentModalViewController:animated:
    [self.sourceViewController presentViewController:self.destinationViewController animated:YES completion:nil];
}
@end

and used it in storyboard thus

PS: accepting Mikael's answer, this here to help newbies like me!

Answer 1

It's the animate checkbox in interface builder that creates this error. If you want to get rid of it and not animate your modal segue you need to create a custom segue and override -(void) perform

All you have to do is keep the segues you have now but set them to custom. Then you create a subclass of UIStoryboardSegue. In the implementation file you put:

- (void)perform
{
// Add your own animation code here.

    [[self sourceViewController] presentModalViewController:[self destinationViewController] animated:NO];
}

You can then use this segue like any other segue. If it's attached to a UIButton it gets called automatically and you do not need performSegue. If not you can use the performSegue that is compatible with iOS5 or even choose a performSegue depending on the version of OS.