-1
我有一個UILabel
在一個表格視圖單元格,我需要不斷顯示兩個座標之間的英里之間。我有兩個座標(經度和緯度)。現在它成功顯示了兩個座標之間的距離,但是如何隨着人的移動而不斷更新UILabel
而無需不斷刷新桌面視圖?萬里之外桌面單元格
這裏是我的代碼:
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath, object: PFObject?) -> PFTableViewCell? {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cells", for: indexPath as IndexPath) as! MyCell
cell.object = object
let currentLocation = CLLocation()
locManager.distanceFilter = 50
if(CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedWhenInUse ||
CLLocationManager.authorizationStatus() == CLAuthorizationStatus.authorizedAlways){
let coordinate₀ = CLLocation(latitude: CLLocationDegrees(-41)!, longitude: CLLocationDegrees(52.3)!)
let coordinate₁ = CLLocation(latitude: currentLocation.coordinate.longitude, longitude: currentLocation.coordinate.latitude)
let distanceInMeters = coordinate₀.distance(from: coordinate₁)
if(distanceInMeters <= 1609)
{
cell.Distance.text = "\(Float(round(distanceInMeters * 3.28084)).cleanValue) ft"
}
else
{
cell.Distance.text = "\(Float(round(distanceInMeters/1609)).cleanValue) mi"
}
}
}
當我更改我的當前位置並重新加載視圖時,數英里之外的數字不會更改。我應該怎麼做 – john
可能有幾件事情可能會出錯。在計算代碼中放置一個斷點。驗證函數是否被調用,並且新的計算確實是正確的。 –