/
UIPageViewControllerDataSource.cs
executable file
·104 lines (91 loc) · 2.32 KB
/
UIPageViewControllerDataSource.cs
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using System;
using System.Collections.Generic;
using System.Linq;
using UIKit;
namespace AircraftForSale
{
public class MultiStepProcessDataSource : UIPageViewControllerDataSource
{
private readonly List<IMultiStepProcessStep> _steps;
public MultiStepProcessDataSource(List<IMultiStepProcessStep> steps)
{
if (steps == null)
{
throw new ArgumentNullException(nameof(steps));
}
if (!steps.Any())
{
throw new ArgumentException("steps cannot be empty.", nameof(steps));
}
if (steps.Any(s => !(s is UIViewController)))
{
throw new ArgumentException("all steps must be a UIViewController", nameof(steps));
}
_steps = steps;
for (int i = 0; i < _steps.Count; i++)
{
var step = _steps[i];
step.StepIndex = i;
}
}
public List<IMultiStepProcessStep> Steps => _steps;
public override UIViewController GetPreviousViewController(UIPageViewController pageViewController,
UIViewController referenceViewController)
{
var step = referenceViewController as IMultiStepProcessStep;
if (step == null)
{
return null;
}
//var index = 0;
//if (step is MyProfileViewController)
//{
// index = Steps.FindIndex(s => s is MyProfileViewController);
//}
//else
//{
// if (step is FavoriteClassificationsViewController)
// {
// index = Steps.FindIndex(s => s is FavoriteClassificationsViewController);
// }
// else {
var index = Steps.IndexOf(step);
// }
//}
if (index <= 0)
{
return null;
}
return _steps[index - 1] as UIViewController;
}
public override UIViewController GetNextViewController(UIPageViewController pageViewController,
UIViewController referenceViewController)
{
var step = referenceViewController as IMultiStepProcessStep;
if (step == null)
{
return null;
}
//var index = 0;
//if (step is MyProfileViewController)
//{
// index = Steps.FindIndex(s => s is MyProfileViewController);
//}
//else
//{
// if (step is FavoriteClassificationsViewController)
// {
// index = Steps.FindIndex(s => s is FavoriteClassificationsViewController);
// }
// else {
var index = Steps.IndexOf(step);
// }
//}
if (index + 1 == _steps.Count)
{
return null;
}
return _steps[(step.StepIndex + 1)] as UIViewController;
}
}
}