Question

我正在制作一个应用，希望在其中多次过滤锻炼数据。

我曾经在UIKit中借助filter，map，for循环来做到这一点，但是在SwiftUI中却没有运气。

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)
        }
    }
}

Answer 1

您必须在可以执行任意代码的地方（例如，在传递给ForEach的值中）进行过滤-而不是在ForEach的实际正文中，因为那样做就不会了。期望回到Void。

例如

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)
        }
    }
}

如何在SwiftUI中过滤数组？

1 个答案: