实在对不起大家，让大家等了这么久才等到这边文章。这段时间有点忙，学习压力有点大。我的Xamarin项目已经放弃，但是大家放心，我还是会把我这段时间所学的全部贴上去的，我也不想这样就抛弃了Xamarin，最起码C#还是比较重要的。这里我再暴露Xamarin的两个坑：
- 1、Xamarin做一些简单功能是没有问题，最好不要涉及需要导入第三方库的功能，Android还比较容易，但是对iOS来说就不同了，需要将第三方库打包成framework,而且framework还要合并，这个教程网上很多，大家可以感受一下。可以看官网https://developer.xamarin.com/guides/cross-platform/macios/binding/ 百度&Google也是可以搜索到相关博客的。
- 2、对Xamarin的生成的APP安装包没有要求的同学可以忽略。Xamarin在iOS上是将C#转成OC运行，而在Android上则是安装一个C#的编译器，以此来运行。我目测了一下，在iOS上应用程序只有3.5M左右，而在Android上能达到65M左右。看看我的github上工程有多大
![Uploading Snip20160925_2_440677.png . . .]
半天没下载下来.png
所以慎入！！！！！！！
Xamarin ListView###
在APP中用的最多的估计也就是表视图了，其他控件相对来说比较简单，我只说ListView，而且今天我只讲最复杂的ListView。其实Android的ListView与之十分相似。但是这里还有一个TableView，大家不要混淆，tableView的Cell需要手动添加，不会根据list自动生成。
我们今天就看自定义ListView。说道自定义ListView无非就是自定义ListView的cell。我们看代码，在代码里分析
方法一####
<ListView x:Name = "customerListView"
SeparatorVisibility = "None"
ItemSelected = "customerListViewItemSelected">
<ListView.RowHeight>
<OnPlatform x:TypeArguments="x:Int32"
iOS="80"
Android="80"
WinPhone="90" />
</ListView.RowHeight>
<ListView.ItemTemplate>
<DataTemplate>
<ViewCell>
<ContentView>
<Frame OutlineColor = "Accent"
Padding = "5">
<StackLayout Orientation = "Vertical">
<Label Text = "{Binding name}"
FontSize = "18"
TextColor = "Black"
HorizontalOptions = "StartAndExpand"/>
<StackLayout Orientation = "Horizontal">
<Label Text = "客户类别"
FontSize = "12"
TextColor = "Gray"
HorizontalOptions = "StartAndExpand"/>
<Label Text = "{Binding customerType}"
FontSize = "12"
TextColor = "Black"
HorizontalOptions = "StartAndExpand"/>
<Label Text = "投资产品(个)"
FontSize = "12"
TextColor = "Gray"
HorizontalOptions = "StartAndExpand"/>
<Label Text = "{Binding investProductCount}"
FontSize = "12"
TextColor = "Black"
HorizontalOptions = "StartAndExpand"/>
</StackLayout>
<StackLayout Orientation = "Horizontal">
<Label Text = "投资份额(份)"
FontSize = "12"
TextColor = "Gray"
HorizontalOptions = "StartAndExpand"/>
<Label Text = "{Binding investShareTotal}"
FontSize = "12"
TextColor = "Black"
HorizontalOptions = "StartAndExpand"/>
<Label Text = "投资金额(元)"
FontSize = "12"
TextColor = "Gray"
HorizontalOptions = "StartAndExpand"/>
<Label Text = "{Binding investShareAmountTotal}"
FontSize = "12"
TextColor = "Black"
HorizontalOptions = "StartAndExpand"/>
</StackLayout>
</StackLayout>
</Frame>
</ContentView>
</ViewCell>
</DataTemplate>
</ListView.ItemTemplate>
</ListView>
这里的ListView.ItemTemplate就是cell的自定义，照着格式写就可以了，至于里面Binding这个暂且不说，下一届我们将具体描述，ItemSelected = "customerListViewItemSelected"就是绑点CS文件里的点击事件。
void customerListViewItemSelected(object sender, SelectedItemChangedEventArgs e)
{
JFCustomerDetailPage customerDetailPage = new JFCustomerDetailPage();
customerDetailPage.customerModel = (JFCustomer)e.SelectedItem;
this.Navigation.PushAsync(customerDetailPage);
}
这是CS文件里选中某一行的方法，是不是很简单，你或许会问，如果ListView要刷新数据怎么办？直接把原数据删掉再放入新数据就可以了。
customerListView.ItemsSource = null;
customerListView.ItemsSource = converted.Items;
方法二####
public class JFTradeCell : ViewCell
{
public JFTradeCell()
{
Label tradeInfoLab = new Label
{
VerticalOptions = LayoutOptions.CenterAndExpand,
HorizontalOptions = LayoutOptions.StartAndExpand,
FontSize = 15,
};
tradeInfoLab.SetBinding(Label.TextProperty, "tradeDataInfo");
Label tradeDateLab = new Label
{
VerticalOptions = LayoutOptions.CenterAndExpand,
HorizontalOptions = LayoutOptions.StartAndExpand,
FontSize = 13,
TextColor = Color.Gray,
};
tradeDateLab.SetBinding(Label.TextProperty, "tradeDate");
Label perNetValueLab = new Label
{
VerticalOptions = LayoutOptions.CenterAndExpand,
HorizontalOptions = LayoutOptions.StartAndExpand,
FontSize = 13,
TextColor = Color.Gray,
};
perNetValueLab.SetBinding(Label.TextProperty, new Binding(
"unitPriceView",
stringFormat: "单位净值：{0}"));
Label tradeAmountLab = new Label
{
VerticalOptions = LayoutOptions.CenterAndExpand,
HorizontalOptions = LayoutOptions.EndAndExpand,
FontSize = 13,
TextColor = Color.Gray,
};
tradeAmountLab.SetBinding(Label.TextProperty, new Binding(
"tradeAmount",
stringFormat: "总金额：{0}"));
StackLayout tradeMoneyStackLayout = new StackLayout()
{
VerticalOptions = LayoutOptions.CenterAndExpand,
HorizontalOptions = LayoutOptions.FillAndExpand,
Orientation = StackOrientation.Horizontal,
Children =
{
perNetValueLab,
tradeAmountLab,
}
};
StackLayout cellMainStackLayout = new StackLayout()
{
Padding = 5,
VerticalOptions = LayoutOptions.FillAndExpand,
HorizontalOptions = LayoutOptions.FillAndExpand,
HeightRequest = 90,
Orientation = StackOrientation.Vertical,
Children =
{
tradeInfoLab,
tradeMoneyStackLayout,
tradeDateLab,
}
};
this.View = cellMainStackLayout;
}
}
用的时候这样用
tradeRecordList = new ListView
{
HasUnevenRows = true,
ItemTemplate = new DataTemplate(typeof(JFTradeCell)),
};
tradeRecordList.ItemSelected += tradeRecordListViewItemSelected;
我想到这里差不多会用了吧，看，你是不是会自定义View了，好吧，我把自定义View也交给你吧，在上述自定义cell的基础上将Viewcell换成contentView就可以了。
结语###
希望微软能将Xamarin完善起来，这样才有其发展之道。我也会持续更新我所学的内容，望大神指点。
