从 swift 中的 MKLocalSearch 对象中检索第一个 'mapItem' 元素
Retrieve first 'mapItem' element from MKLocalSearch object in swift
首先我想说我是 swift 语言的新手。
我的问题几乎反映了这个问题:
但是,当我将其应用于外观相似的代码时,出现错误 "Value of type 'MKLocalSearch' has no member 'mapItems'"
就像上面的 link 一样,我想要第一个 mapItems (mapItems[0]) 结果。
有人可以帮助我吗?
这是我的代码:
let latitude = String(currentLocation.coordinate.latitude)
let longitude = String(currentLocation.coordinate.longitude)
var station1Unwrapped: String! = ""
var station2Unwrapped: String! = ""
var coord: CLLocationCoordinate2D!
coord = CLLocationCoordinate2DMake(currentLocation.coordinate.latitude, currentLocation.coordinate.longitude);
var region: MKCoordinateRegion!
region = MKCoordinateRegion(center: coord, latitudinalMeters: 100, longitudinalMeters: 100);
let request = MKLocalSearch.Request()
request.naturalLanguageQuery = "Train Station"
request.region = region
let search = MKLocalSearch(request: request)
search.start { response, error in
guard let response = response else {
print("There was an error searching for: \(String(describing: request.naturalLanguageQuery)) error: \(String(describing: error))")
return
}
print("Inside function")
let station1 = response.mapItems[0].name
}
var newLocVar = (search.mapItems[0] as! MKMapItem).name
print(newLocVar)
变量search
是MKLocalSearch
,所以它没有属性mapItems
。如果你想打印 MKMapItem's name
,你应该访问完成块中的 mapItems
,在那里你可以访问 response
即 MKLocalSearch.Response
。您写的 let station1 = response.mapItems[0].name
行完全正确,它包含找到的第一个 mapItems
的名称
首先我想说我是 swift 语言的新手。
我的问题几乎反映了这个问题:
但是,当我将其应用于外观相似的代码时,出现错误 "Value of type 'MKLocalSearch' has no member 'mapItems'"
就像上面的 link 一样,我想要第一个 mapItems (mapItems[0]) 结果。 有人可以帮助我吗?
这是我的代码:
let latitude = String(currentLocation.coordinate.latitude)
let longitude = String(currentLocation.coordinate.longitude)
var station1Unwrapped: String! = ""
var station2Unwrapped: String! = ""
var coord: CLLocationCoordinate2D!
coord = CLLocationCoordinate2DMake(currentLocation.coordinate.latitude, currentLocation.coordinate.longitude);
var region: MKCoordinateRegion!
region = MKCoordinateRegion(center: coord, latitudinalMeters: 100, longitudinalMeters: 100);
let request = MKLocalSearch.Request()
request.naturalLanguageQuery = "Train Station"
request.region = region
let search = MKLocalSearch(request: request)
search.start { response, error in
guard let response = response else {
print("There was an error searching for: \(String(describing: request.naturalLanguageQuery)) error: \(String(describing: error))")
return
}
print("Inside function")
let station1 = response.mapItems[0].name
}
var newLocVar = (search.mapItems[0] as! MKMapItem).name
print(newLocVar)
变量search
是MKLocalSearch
,所以它没有属性mapItems
。如果你想打印 MKMapItem's name
,你应该访问完成块中的 mapItems
,在那里你可以访问 response
即 MKLocalSearch.Response
。您写的 let station1 = response.mapItems[0].name
行完全正确,它包含找到的第一个 mapItems