blocks|key|3981200|text|您正在处理的swift+(不是objective-c)对象不是一个数组，而是一个字典。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3981201|import+Swift
print(type(of:+[12:+2,+22:+180]))
//+Dictionary<Int,+Int>|code-block|syntax|javascript|3981202|它所期望的数组是您想要的所有格式替换参数的数组；在本例中，该数组的长度为1，并且只包含字典。您可以将其转换为您的NativeScript+JavaScript/TypeScript：|offset|length|style|CODE|3981203|const+expr+=+NSExpression.expressionWithFormatArgumentArray(
++"mgl_interpolate:withCurveType:parameters:stops:($zoomLevel,+'exponential',+1.75,+%25@)",
++[{12:+2,+22:+180}]);|3981204|entityMap^0|0|0|10|1|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

The swift (not objective-c) object you're dealing with there is not an array, but a dictionary.

<pre><code>import Swift
print(type(of: [12: 2, 22: 180]))
// Dictionary&lt;Int, Int&gt;
</code></pre>

The array that it's expecting is an array of all of the format substitution parameters that you want; in this case, that array is of length <code>1</code> and contains just the dictionary. You could translate this into your NativeScript JavaScript/TypeScript:

<pre><code>const expr = NSExpression.expressionWithFormatArgumentArray(
 "mgl_interpolate:withCurveType:parameters:stops:($zoomLevel, 'exponential', 1.75, %@)",
 [{12: 2, 22: 180}]);
</code></pre>

blocks|key|3981249|text|好了，只是循环回来完成这个线程，我已经/终于/想出了如何让它在不崩溃的情况下工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3981250|该方法需要一个包含NSDictionary类型的数组，并且对于this+issue和this+one，NSDictionary的NativeScript类型定义似乎是不正确的。|offset|length|3981251|因此，经过几天的反复试验，将Objective-C调用转换为：|3981252|layer.circleRadius+=+[NSExpression+expressionWithFormat:+@"mgl_interpolate:withCurveType:parameters:stops:($zoomLevel,+'exponential',+1.75,+%25@)",
@{@12:+@2,+@22:+@180}];|code-block|syntax|javascript|3981253|转换为TypeScript/NativeScript是完全违反直觉的：|3981254|let+nsDict+=+new+(NSDictionary+as+any)(+[+2,+180+],+[+12,+22+]+);
let+nsArray+=+NSArray.arrayWithArray(+[+nsDict+]+);

layer.circleRadius+=+NSExpression.expressionWithFormatArgumentArray(
++"mgl_interpolate:withCurveType:parameters:stops:($zoomLevel,+'exponential',+1.75,+%25@)",+nsArray+);|3981255|这将编译并运行。请注意，键位于值之后的单独数组中，而不是反过来。|3981256|如果您使用上面建议的NSDictionary方法，您会得到一个编译错误，因为很明显类型不支持这种表示法。|3981257|升级到最新的NativeScript和核心模块确实允许它编译建议的NSArray()+[]引用，但结果代码会导致异常:即：|3981258|const+expr+=+NSExpression.expressionWithFormatArgumentArray(+"mgl_interpolate:withCurveType:parameters:stops:($zoomLevel,+'exponential',+1.75,+%25@)",+[{12:+2,+22:+180}]);|3981259|崩溃并引发异常。|3981260|据我所知，该数组没有正确地封送到NSDictionary实例中。与使用NSArray.arrayWithArray(+...+)相同；|3981261|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/NativeScript/NativeScript/issues/1814|1|https://github.com/NativeScript/NativeScript/issues/6001^0|0|V|A|0|16|8|1|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1C|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|1D|8|@]|9|@$D|1E|E|1F|1|1G]|$D|1H|E|1I|1|1J]]|A|$]]|$1|F|3|G|5|6|7|1K|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|1L|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1M|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|1N|8|@]|9|@]|A|$K|L]]|$1|Q|3|R|5|6|7|1O|8|@]|9|@]|A|$]]|$1|S|3|T|5|6|7|1P|8|@]|9|@]|A|$]]|$1|U|3|V|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|W|3|X|5|J|7|1R|8|@]|9|@]|A|$K|L]]|$1|Y|3|Z|5|6|7|1S|8|@]|9|@]|A|$]]|$1|10|3|11|5|6|7|1T|8|@]|9|@]|A|$]]|$1|12|3|-4|5|6|7|1U|8|@]|9|@]|A|$]]]|13|$14|$5|15|16|17|A|$18|19]]|1A|$5|15|16|17|A|$18|1B]]]]

Ok, just to loop back and finish up this thread, I have /finally/ figured out how to get this to work without crashing. 

The method requires an array with an NSDictionary type in it and it appears the NativeScript type definition for NSDictionary is incorrect per <a href="https://github.com/NativeScript/NativeScript/issues/1814" rel="nofollow noreferrer">this issue</a> and <a href="https://github.com/NativeScript/NativeScript/issues/6001" rel="nofollow noreferrer">this one</a>. 

So after a few days of trial and error, converting the Objective-C call:

<pre><code>layer.circleRadius = [NSExpression expressionWithFormat: @"mgl_interpolate:withCurveType:parameters:stops:($zoomLevel, 'exponential', 1.75, %@)",
@{@12: @2, @22: @180}];
</code></pre>

into TypeScript/NativeScript is completely counterintuitive:

<pre><code>let nsDict = new (NSDictionary as any)( [ 2, 180 ], [ 12, 22 ] );
let nsArray = NSArray.arrayWithArray( [ nsDict ] );

layer.circleRadius = NSExpression.expressionWithFormatArgumentArray(
 "mgl_interpolate:withCurveType:parameters:stops:($zoomLevel, 'exponential', 1.75, %@)", nsArray );
</code></pre>

This compiles and works. Note that the keys are in a separate array that follow the values, not the other way around.

If you use the NSDictionary approach suggested above you get a compile error because apparently the typing doesn't support that notation.

Upgrading to the latest NativeScript and core modules did allow it to compile the suggested NSArray() [] reference but the resulting code causes an exception:, namely:

<pre><code>const expr = NSExpression.expressionWithFormatArgumentArray( "mgl_interpolate:withCurveType:parameters:stops:($zoomLevel, 'exponential', 1.75, %@)", [{12: 2, 22: 180}]);
</code></pre>

crashes with an exception. 

The array, as far as I am able to tell, is not correctly marshalled into an NSDictionary instance. Same for using NSArray.arrayWithArray( [ ... ] );

I am working on expanding the <a href="https://github.com/EddyVerbruggen/nativescript-mapbox" rel="nofollow noreferrer">NativeScript-Mapbox plugin</a> to include the ability to render circles that resize as the map is zoomed. I am working off the <a href="https://docs.mapbox.com/ios/api/maps/4.8.0/Classes/MGLCircleStyleLayer.html" rel="nofollow noreferrer">example on this page</a>.

On iOS, I am running into problem trying to translate this NSExpression call into NativeScript:

<pre><code>layer.circleRadius = [NSExpression expressionWithFormat: @"mgl_interpolate:withCurveType:parameters:stops:($zoomLevel, 'exponential', 1.75, %@)",
@{@12: @2, @22: @180}];
</code></pre>

It looks to me that the NativeScript analogue to this call listed in tns-platform-declarations .. objc!Foundation.d.ts NSExpression definition is:

<pre><code>static expressionWithFormatArgumentArray(expressionFormat: string, _arguments: NSArray&lt;any&gt;): NSExpression;
</code></pre>

Is this the correct method?

If so, how do I turn [12: 2, 22: 180] into an NSArray type?

Lacking documentation, I have tried creating an array of arrays and passing it to:

<pre><code>new NSArray( {objects: myArray} );
</code></pre>

but it crashes horribly with a segfault. 

Clearly, I am missing something.

How to call Objective-C NSExpression( format: ....) from NativeScript?

NativeScript

Objective-C

TypeScript

Swift

我正在对进行扩展，以包括渲染随着地图缩放而调整大小的圆的功能。我在上工作。在iOS上，我在尝试将此NSExpression调用转换为NativeScript时遇到了问题：layer.circleRadius = [NSExpression expressionWithFormat: @"mgl_interpolate:...

问如何调用Objective-C NSExpression(格式：....)从NativeScript？
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