一些背景
在这个屏幕上,您可以添加和删除人员。不是所有字段都是必需的,因此单元格高度是动态的。
问题
如果我先添加一个填写了所有字段的人员,然后再添加一个没有填写所有字段的人员,接着删除第一个人员,则第二个人员将占据第一个人员的位置,但使用第一个人员的布局。
重要提示
在我删除第一个人员后,如果我向上滚动直到剩余单元格离开屏幕,那么它会自动修复。
代码
这是表格源码
namespace xXxx.xXxx.iOS
{
public class SiniestroParticipantesSource : MvxTableViewSource
{
private readonly SiniestroParticipantesViewModel viewModel;
public SiniestroParticipantesSource(UITableView tableView, SiniestroParticipantesViewModel viewModel)
: base(tableView)
{
this.UseAnimations = true;
this.AddAnimation = UITableViewRowAnimation.Top;
this.RemoveAnimation = UITableViewRowAnimation.Middle;
this.viewModel = viewModel;
tableView.RegisterNibForCellReuse(UINib.FromName(PersonaDenunciaCellView.Key, NSBundle.MainBundle), PersonaDenunciaCellView.Key);
}
public override void RowSelected(UITableView tableView, NSIndexPath indexPath)
{
tableView.DeselectRow(indexPath, true);
var itemPersona = this.viewModel.Personas[indexPath.Section];
this.viewModel.AgregarCommand.Execute(itemPersona);
}
protected override UITableViewCell GetOrCreateCellFor(UITableView tableView, NSIndexPath indexPath, object item)
{
var cell = (PersonaDenunciaCellView)tableView.DequeueReusableCell(PersonaDenunciaCellView.Key, indexPath);
return cell;
}
public override nint RowsInSection(UITableView tableview, nint section)
{
return 1;
}
public override nint NumberOfSections(UITableView tableView)
{
return this.viewModel.Personas.Count;
}
protected override object GetItemAt(NSIndexPath indexPath)
{
return this.viewModel.Personas[indexPath.Section];
}
}
}
这是单元格视图。
namespace xXxx.xXxx.iOS
{
public partial class PersonaDenunciaCellView : MvxTableViewCell
{
public static readonly NSString Key = new NSString("PersonaDenunciaCellView");
public static readonly UINib Nib;
static PersonaDenunciaCellView()
{
Nib = UINib.FromName("PersonaDenunciaCellView", NSBundle.MainBundle);
}
protected PersonaDenunciaCellView(IntPtr handle) : base(handle)
{
this.DelayBind(() =>
{
var set = this.CreateBindingSet<PersonaDenunciaCellView, PersonaDenunciaItemViewModel>();
set.Bind(btnRemove).To(vm => vm.RemoveCommand);
set.Bind(lblNombre).To(vm => vm.Persona.Persona.Nombre);
set.Bind(lblTipoDoc).To(vm => vm.Persona.Persona.TipoDoc.Descripcion);
set.Bind(tipoDocVisibilityConst).For("Priority").To(vm => vm.Persona.Persona.Nrodoc).WithConversion("iOSVisibility", true);
set.Bind(lblNrodoc).To(vm => vm.Persona.Persona.Nrodoc);
set.Bind(nroDocVisibilityConst).For("Priority").To(vm => vm.Persona.Persona.Nrodoc).WithConversion("iOSVisibility", true);
set.Bind(lblMailContacto).To(vm => vm.Persona.MailContacto);
set.Bind(mailContactoVisibilityConst).For("Priority").To(vm => vm.Persona.MailContacto).WithConversion("iOSVisibility", true);
set.Bind(lblTelContacto).To(vm => vm.Persona.TelContacto);
set.Bind(telContactoVisibilityConst).For("Priority").To(vm => vm.Persona.TelContacto).WithConversion("iOSVisibility", true);
set.Bind(lblLesionado).To(vm => vm.Persona.Lesionado).WithConversion("Lesionado");
set.Bind(vehiculoVisibilityConst).For("Priority").To(vm => vm.Persona.Patente).WithConversion("iOSVisibility", true);
set.Bind(viewVehiculo).For("Visibility").To(vm => vm.Persona.Patente).WithConversion("Visibility");
set.Bind(lblPatente).To(vm => vm.Persona.Patente);
set.Bind(lblCiaSeguroDesc).To(vm => vm.Persona.CiaSeguroDesc);
set.Apply();
});
}
}
}
单元格视图模型
namespace xXxx.xXxx.Core.ViewModels.Items
{
public class PersonaDenunciaItemViewModel:MvxViewModel
{
private readonly IMvxMessenger messenger;
private readonly IUserInteraction userInteraction;
public string Index { get; set; }
public PersonaDenunciaItemViewModel (SiniestroCarga.PersonaDenuncia persona, IMvxMessenger messenger, IUserInteraction userInteraction, string index)
{
this.messenger = messenger;
this.userInteraction = userInteraction;
this.Persona = persona;
this.Index = index;
}
private SiniestroCarga.PersonaDenuncia persona;
public SiniestroCarga.PersonaDenuncia Persona
{
get
{
return this.persona;
}
set
{
this.persona = value;
this.RaisePropertyChanged(() => this.Persona);
}
}
private ICommand removeCommand;
public ICommand RemoveCommand
{
get
{
return this.removeCommand = this.removeCommand ?? new MvxCommand(this.RemovePersona);
}
}
private void RemovePersona()
{
this.userInteraction.Confirm("Are you sure?", () =>
{
this.messenger.Publish(new RemovePersonaDenunciaMessage(this, this.Persona, this.Index));
}, null, "OK", "Cancel");
}
}
}
最后一个消息者。Publish被订阅到另一个ViewModel上。
OnRemovePersonaDenuncia = message =>
{
var listPersonas = new ObservableCollection<PersonaDenunciaItemViewModel>(this.Personas);
listPersonas.Remove(this.Personas.First(p => p.Index == message.Index));
this.Personas = listPersonas;
}
更新
将RemoveCommand的实现更改为以下内容
this.Personas.Remove(this.Personas.First(p => p.Index == message.Index));
当我按下删除按钮时,模拟器会无错误关闭。在Xamarin Studio中的应用程序跟踪显示如下信息:
*** Assertion failure in -[UITableView _endCellAnimationsWithContext:], /BuildRoot/Library/Caches/com.apple.xbs/Sources/UIKit_Sim/UIKit-3512.60.7/UITableView.m:1700