How can I filter an array in SwiftUI?

Question

I am making an application in which I want to filter an array of workout data more times.

I used to do it by the help of filter, map, for loop in UIKit, but in SwiftUI no luck.

List {
    if workoutsModel.workoutsAreFiltered {
        ForEach(workoutsModel.workoutsFilter) { workoutFilter in
            if workoutFilter.isOn {
                ForEach(self.workoutsModel.workout) { workout in
                    if workoutFilter.name == workout.goal || workout.muscles.contains(workoutFilter.name) {
                        WorkoutsRow(workout: workout)
                    }
                }
            }
        }
    } else {
        ForEach(self.workoutsModel.workout) { workout in
            WorkoutsRow(workout: workout)
        }
    }
}

How about helping others out? A good answer deserves something, right? — user7014451
– user7014451, Commented Jul 8, 2019 at 1:41

idolize · Accepted Answer · 2019-07-09 00:08:40Z

2

You have to do the filtering in a place where you can execute arbitrary code (e.g. in the value passed to ForEach) -- not inside the actual body of the ForEach, as that doesn't expect to get back Void.

E.g.

List {
    if workoutsModel.workoutsAreFiltered {
        ForEach(workoutsModel.workoutsFilter) { workoutFilter in
            // Not sure if the `if workoutFilter.isOn` is allowed, so I've instead used it to only iterate an empty array
            ForEach(!workoutFilter.isOn ? [] : self.workoutsModel.workout.filter { workout in
                workoutFilter.name == workout.goal ||
                workout.muscles.contains(workoutFilter.name)
            }) { workout in
                WorkoutsRow(workout: workout)
            }
        }
    } else {
        ForEach(self.workoutsModel.workout) { workout in
            WorkoutsRow(workout: workout)
        }
    }
}

edited Jul 9, 2019 at 0:08

answered Jul 7, 2019 at 21:39

idolize

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1 Comment

idolize Over a year ago

Done. Sorry I posted too soon with just the code before I added explanation.

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