Question

我有一个＆＃34;地点＆＃34;具有坐标和名称的对象。

例如：

let places = [place(name: "Eiffel Tower", latitude: 48.8582, longitude: 2.2945), place(name: "Statue of Liberty", latitude: 40.6892, longitude: -74.0444), place(name: "Tower of London", latitude: 51.5081, longitude: -0.0761)]

从这个数组中，我想使用map创建一个新的MKPointAnnotations数组。我知道它是这样开始的：

let placeAnnotations = places.map{ (place -> MKPointAnnotation // but that's about all I know for sure!}

...我不知道如何在不提交语法错误的情况下设置MKPointAnnotation的.coordinate和.title属性。谢谢！

Answer 1

是的，你正走在正确的轨道上。这是完整的代码：

let places = [place(name: "Eiffel Tower", latitude: 48.8582, longitude: 2.2945), place(name: "Statue of Liberty", latitude: 40.6892, longitude: -74.0444), place(name: "Tower of London", latitude: 51.5081, longitude: -0.0761)]

let annotations = places.map { aPlace -> MKPointAnnotation in
    let annotation = MKPointAnnotation()
    annotation.coordinate = CLLocationCoordinate2D(latitude: aPlace.latitude, longitude: aPlace.longitude)
    return annotation
}

println(annotations)

在swift中使用map函数来制作MKPointAnnotations

1 个答案: