新数据类型

NATIVE TYPE	32-BIT BACKING TYPE	64-BIT BACKING TYPE
`System.nint`	`System.Int32` (`int`)	`System.Int64` (`long`)
`System.nuint`	`System.UInt32` (`uint`)	`System.UInt64` (`ulong`)
`System.nfloat`	`System.Single` (`float`)	`System.Double` (`double`)

OLD TYPE IN SYSTEM.DRAWING	NEW DATA TYPE	DESCRIPTION
`RectangleF`	`CGRect`	Holds floating point rectangle information.
`SizeF`	`CGSize`	Holds floating point size information (width, height)
`PointF`	`CGPoint`	Holds a floating point, point information (X, Y)

检查平台架构

if (IntPtr.Size == ) {

    Console.WriteLine ("32-bit App");

} else if (IntPtr.Size == ) {

    Console.WriteLine ("64-bit App");

}

Arrays and System.Collections.Generic

集合索引需要显示转换

public List<string> Names = new List<string>();

...

public string GetName(nint index) {

    return Names[(int)index];

}

DateTime 与 NSDate需要显示转换

下面两个扩展方法帮助实现隐式转换：

public static DateTime NSDateToDateTime(this NSDate date)

{

    // NSDate has a wider range than DateTime, so clip

    // the converted date to DateTime.Min|MaxValue.

    double secs = date.SecondsSinceReferenceDate;

    if (secs < -)

        return DateTime.MinValue;

    if (secs > )

        return DateTime.MaxValue;

    return (DateTime) date;

}

public static NSDate DateTimeToNSDate(this DateTime date)

{

    if (date.Kind == DateTimeKind.Unspecified)

        date = DateTime.SpecifyKind (date, /* DateTimeKind.Local or DateTimeKind.Utc, this depends on each app */)

    return (NSDate) date;

}

NSAction Replaced with Action

Custom delegates replaced with Action<T>

Task<bool> replaced with Task<Tuple<Boolean,NSError>>

巴特西

Xamarin.iOS Unified API 注意要点

新数据类型

检查平台架构

Arrays and System.Collections.Generic

DateTime 与 NSDate需要显示转换

NSAction Replaced with Action

Custom delegates replaced with Action<T>

Task<bool> replaced with Task<Tuple<Boolean,NSError>>

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