Validate NSPredicate format

Asked Mar 16 '17 at 17:55

Active Mar 16 '17 at 17:55

Viewed 376 times

In my app user can create NSPredicates by using NSPredicateEditor. I want to validate that user entered correct RegEx in NSPredicateEditorRow by testing NSPredicate.

@IBAction func predicateChanged(_ sender: NSPredicateEditor) {
//I want to test sender.predicate

Is that possible?

asked Mar 16 '17 at 17:55

Shmidt

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Yes, it is possible in Objective-c and probably is possible in Swift. – Willeke Mar 17 '17 at 13:25
@Willeke and how exactly is it possible? – Shmidt Mar 17 '17 at 13:40
In Objective-C I do `[predicate evaluateWithObject:someObject];` inside a @try and @catch block. `someObject` is a `NSDictionary` or other object which responds to the keys in the predicate editor. – Willeke Mar 17 '17 at 22:20
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```@try``` and ```@catch``` doesn't catch anything, because ```evaluateWithObject``` doesn't throw na exception. – Shmidt Mar 17 '17 at 22:30
It does in my test app. – Willeke Mar 17 '17 at 22:43
@Willeke your test app is in Swift? – Shmidt Mar 17 '17 at 22:50
No, it's Objective-C – Willeke Mar 17 '17 at 23:27

Validate NSPredicate format

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