带有纬度和经度的 CLLocation 对象答案

【问题标题】：CLLocation object in swift with latitude and longitude带有纬度和经度的 CLLocation 对象
【发布时间】：2017-11-12 09:50:56
【问题描述】：

我会尝试设置 CLLocation 对象的纬度和经度属性，但运行时出现此错误：

无法将 CLlocation 对象转换为 EMTrackPoint 对象

for element in objectsArray {
    let item = CLLocation(latitude: element.latitude, longitude: element.longitude) as! EMTrackPoint

    item.mElevation = element.ele
    item.mOrientation = element.orientation
    item.mDate = Date()
    if element.poiActive != ""{
         GPXActive.add(element.poiActive.components(separatedBy: ","))
    }
    GPXDanger.add(element.dangerActive.components(separatedBy: ","))
    item.mActivePOIs = GPXActive
    item.mActiveDangers = GPXDanger
    GPXPoints.add(item)
}

Objective C 中的EMTrackPoint 类：

@interface EMTrackPoint : CLLocation

@property (nonatomic, assign) double mElevation;
@property (nonatomic, retain) NSDate *mDate;
@property (nonatomic, retain) NSMutableArray *mActivePOIs;
@property (nonatomic, retain) NSMutableArray *mActiveDangers;
@property (nonatomic, assign) double mOrientation;
@property (nonatomic, assign) double mSpeed;

请帮忙。

【问题讨论】：

标签： objective-c swift cllocation

【解决方案1】：

每个EMTrackPoint 也是一个CLLocation 那么为什么不首先初始化一个EMTrackPoint 实例而不是进行类型转换：

for element in objectsArray {
    let item = EMTrackPoint(latitude: element.latitude, longitude: element.longitude)
    item.mElevation = element.ele
    item.mOrientation = element.orientation
    item.mDate = Date()
    ...

【讨论】：