回答編集履歴
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コード追記
test
CHANGED
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@@ -9,3 +9,137 @@
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原因は提示されているコード以外の部分にあるように思えるのですが、如何でしょうか。
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（例えば、1秒毎にインクリメントしているのがフィールド変数のcountだったりとか…）
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```cs
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public class CClass : INotifyPropertyChanged
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{
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public ICommand StartTimerCommand { get; }
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public event PropertyChangedEventHandler PropertyChanged = delegate { };
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int count;
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public CClass()
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{
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StartTimerCommand = new Command(() =>
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{
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Device.StartTimer(
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TimeSpan.FromSeconds(1),
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() => { Counter++; return true; });
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});
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}
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public int Counter
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{
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get
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{
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return this.count;
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}
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set
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{
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if (this.count != value)
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{
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this.count = value;
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OnPropertyChanged("Counter");
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}
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}
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}
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protected virtual void OnPropertyChanged(string propertyName)
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{
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PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
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}
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}
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```
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```xaml
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<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
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xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
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xmlns:local="clr-namespace:App1"
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x:Class="App1.MainPage">
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<ContentPage.BindingContext>
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<local:CClass />
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</ContentPage.BindingContext>
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<StackLayout VerticalOptions="Center">
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<Label Text="{Binding Counter, Mode = TwoWay, StringFormat='{0}'}"
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x:name="CountLabel"
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BackgroundColor="Aqua"
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HorizontalTextAlignment="Center"
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VerticalTextAlignment="Center"/>
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<Button Text="Start"
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Command="{Binding StartTimerCommand}"
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VerticalOptions="Center"
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HorizontalOptions="Center" />
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</StackLayout>
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</ContentPage>
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```
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