[英]Cannot assign value of type '[String]' to type 'String? Swift 2
我收到與此行“ point.title = r”和此行“ point.subtitle = z”相關聯的錯誤消息“無法將類型'[String]'的值分配給類型'String?'”。 我已經嘗試了很多東西,例如place.description,它使整個數組成為一個字符串...
//I have multiple arrays, lat, long and pass besides place.
var place = [String]()
//I have four of the chunks of code for each array
let json = try NSJSONSerialization.JSONObjectWithData(jSONData, options: .AllowFragments)
if let dataFile3 = json["data"] as? [[String: AnyObject]] {
for c in dataFile3 {
if let placeName = c["PlaceName"] {
place.append((placeName as? String)!)
for var (i,x) in zip(lat, long) {
for _ in place {
for _ in pass {
print(i)
print(x)
//print(i + ", " + x)
// String to double conversion, can I do this when I set the array as a string?
let lati = NSString(string: i).doubleValue
let longi = NSString(string: x).doubleValue
//I have a list of values array so I need to have a for loop that inputs the value over and over again.
var point = MGLPointAnnotation()
point.coordinate = CLLocationCoordinate2D(latitude: lati, longitude: longi)
point.title = place
point.subtitle = pass
mapView.addAnnotation(point)
}}}
//var i and x for loop
}
//viewDidLoad
}
//creates the markers popup for each point with data
func mapView(mapView: MGLMapView, annotationCanShowCallout annotation: MGLAnnotation) -> Bool {
// Always try to show a callout when an annotation is tapped.
return true
}
如何解決以上錯誤?
編輯:在Santosh的幫助下,這就是我所改變的...
let point = MGLPointAnnotation()
var i = lat
var x = long
//lat and long is served and then all the r,z points, then another lat, long...need to fix this and it may work.
for (i,x) in zip(lat, long) {
for aPlace in place {
for aPass in pass {
print(i)
print(x)
// String to double conversion, can I do this when I set the array as a string?
let lati = NSString(string: i).doubleValue
let longi = NSString(string: x).doubleValue
point.coordinate = CLLocationCoordinate2D(latitude: lati, longitude: longi)
point.title = aPlace
print(aPlace)
point.subtitle = aPass
print(aPass)
self.mapView.addAnnotation(point)
}}}
現在可以正常運行,或者至少報告正確的值,但是循環只是保持循環...
嘗試這個:
//I have four of the chunks of code for each array
let json = try NSJSONSerialization.JSONObjectWithData(jSONData, options: .AllowFragments)
if let dataFile3 = json["data"] as? [[String: AnyObject]] {
for c in dataFile3 {
if let placeName = c["PlaceName"] {
place.append((placeName as? String)!)
for var (i,x) in zip(lat, long) {
for aPlace in place {
for aPass in pass {
print(i)
print(x)
//print(i + ", " + x)
// String to double conversion, can I do this when I set the array as a string?
let lati = NSString(string: i).doubleValue
let longi = NSString(string: x).doubleValue
//I have a list of values array so I need to have a for loop that inputs the value over and over again.
var point = MGLPointAnnotation()
point.coordinate = CLLocationCoordinate2D(latitude: lati, longitude: longi)
point.title = aPlace
point.subtitle = aPass
mapView.addAnnotation(point)
}}}
//var i and x for loop
}
//viewDidLoad
}
}
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