Xamarin表单密码和确认密码验证

Question

我有一个Xamarin Forms申请,我有一个注册表格,我需要验证密码和确认密码字段应该是相同的.

有没有办法实现这个使用Xamarin Behaviour？

我已经实施Xamarin Behaviour了如下Required Field验证和Email Regex验证 -

public class RequiredValidatorBehavior : Behavior<Entry>
    {
        static readonly BindablePropertyKey IsValidPropertyKey = BindableProperty.CreateReadOnly("IsValid", typeof(bool), typeof(RequiredValidatorBehavior), false);
        static readonly BindableProperty IsValidProperty = IsValidPropertyKey.BindableProperty;

        public bool IsValid
        {
            get { return (bool)base.GetValue(IsValidProperty); }
            private set { base.SetValue(IsValidPropertyKey, value); }
        }

        protected override void OnAttachedTo(Entry bindable)
        {
            bindable.Unfocused += HandleFocusChanged;
            base.OnAttachedTo(bindable);
        }
        protected override void OnDetachingFrom(Entry bindable)
        {
            bindable.Unfocused -= HandleFocusChanged;
            base.OnDetachingFrom(bindable);
        }
        void HandleFocusChanged(object sender, FocusEventArgs e)
        {
            IsValid = !string.IsNullOrEmpty (((Entry)sender).Text);
        }
    }

实施Behaviour中XAML Content Page-

<Entry x:Name="password" Placeholder="New Password">
    <Entry.Behaviors>
        <local:RequiredValidatorBehavior x:Name="passwordValidator"/>   
    </Entry.Behaviors>
</Entry>

问题是 - 我是Xamarin开发新手,并且不知道如何获得两者Password和Confirm Password字段的值,Behaviour以便我可以比较它们.我不希望在提交表单时单击按钮来比较它们,应在用户键入字段时比较字段.任何代码,帮助或指导都是可观的.

Answer 1

https://forums.xamarin.com/discussion/34695/xaml-how-do-you-pass-a-control-view-reference-into-a-behavior

这会对你有所帮助.您将使用Compare Validator行为,如下所示.

<behaviors:CompareValidator x:Name="ComparePasswordsValidator" 
        CompareToEntry="{Binding Source={x:Reference PasswordEntry}}" /> 

最后解决方案:

XAML-

<Entry x:Name="password" Placeholder="New Password" IsPassword="true">
    <Entry.Behaviors>
        <local:RequiredValidatorBehavior x:Name="passwordValidator"/>   
    </Entry.Behaviors>
</Entry>
<Entry x:Name="confirmPassword" Placeholder="Confirm Password" IsPassword="true">
    <Entry.Behaviors>
        <local:ConfirmPasswordBehavior x:Name="confirmPasswordBehavior" CompareToEntry="{Binding Source={x:Reference password}}" />
    </Entry.Behaviors>
</Entry>

行为-

    public class ConfirmPasswordBehavior : Behavior<Entry>
    {
        static readonly BindablePropertyKey IsValidPropertyKey = BindableProperty.CreateReadOnly("IsValid", typeof(bool), typeof(ConfirmPasswordBehavior), false);
        public static readonly BindableProperty IsValidProperty = IsValidPropertyKey.BindableProperty;

        public static readonly BindableProperty CompareToEntryProperty = BindableProperty.Create("CompareToEntry", typeof(Entry), typeof(ConfirmPasswordBehavior), null);

        public Entry CompareToEntry
        {
            get { return (Entry)base.GetValue(CompareToEntryProperty); }
            set { base.SetValue(CompareToEntryProperty, value); }
        }
        public bool IsValid
        {
            get { return (bool)base.GetValue(IsValidProperty); }
            private set { base.SetValue(IsValidPropertyKey, value); }
        }
        protected override void OnAttachedTo(Entry bindable)
        {
            bindable.TextChanged += HandleTextChanged;
            base.OnAttachedTo(bindable);
        }
        protected override void OnDetachingFrom(Entry bindable)
        {
            bindable.TextChanged -= HandleTextChanged;
            base.OnDetachingFrom(bindable);
        }
        void HandleTextChanged(object sender, TextChangedEventArgs e)
        {
            var password = CompareToEntry.Text;
            var confirmPassword = e.NewTextValue;
            IsValid = password.Equals (confirmPassword);
        }
    }