RestKit RKObjectMapping Swift 可选 [英] RestKit RKObjectMapping Swift Optional

问题描述

我有一个名为 Activity 的 swift 模型，它可以选择附加一个 coordinate.

I have a swift model called Activity that can optionally have a coordinate attached to it.

import MapKit

class Activity: NSObject {

    var coordinate: CLLocationCoordinate2D?

    class func objectMapping() -> RKObjectMapping {
        let mapping = RKObjectMapping(forClass: self)

        let coordinateMapping = RKAttributeMapping(fromKeyPath: "coordinate", toKeyPath: "coordinate")
        coordinateMapping.valueTransformer = RKCLLocationCoordinate2DValueTransformer()
        mapping.addPropertyMapping(coordinateMapping)

        return mapping
    }
}

当启动我的应用程序时，这给了我:

When launching my application this however gives me:

2015-05-05 12:14:30.741 Sample[54338:531558] *** 由于未捕获的异常NSUnknownKeyException"而终止应用程序，原因:[setValue:forUndefinedKey:]:此类不是键值编码-符合关键坐标.'

2015-05-05 12:14:30.741 Sample[54338:531558] *** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[ setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key coordinate.'

如果我将 coordinate 更改为非可选并提供应用程序运行的默认值.

If I change coordinate to be non-optional and supply a default the application runs.

所以我的问题是如何在 Optionals 方面快速使用 RestKit?

So my question is how do I use RestKit in swift in regards to Optionals?

推荐答案

使您的财产动态

dynamic var coordinate: CLLocationCoordinate2D?

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