How to have for loop that iterates through indexes as in objective-C (Swift)?

Question

I am developing a Google Maps app and I have the following code:

func drawPolygon(){
var cord: Array<CLLocationCoordinate2D> = []
let path = GMSMutablePath()
// get path for polygon
for marker in markersArray {
let lat = coord.insert(marker.componentsSeparatedByString(",")[i] as NSString).doubleValue, atIndex:[i][0]
let lng = coord.insert(marker.componentsSeparatedByString(",")[i+1] as NSString).doubleValue, atIndex:[i][1]
path.addCoordinate(CLLocationCoordinate2DMake(coord[i][0]))
path.addCoordinate(CLLocationCoordinate2DMake(coord[i][1]))
}

As you can see I would like to increment the index by one every time so all coordinates get inserted. How do I achieve this?

Steffen Lund Andersen · Accepted Answer · 2017-03-30 18:27:23Z

2

There is a build in mechanism for that.

func drawPolygon(){
var cord: Array<CLLocationCoordinate2D> = []
let path = GMSMutablePath()
// get path for polygon
for (marker, i) in markersArray.enumerated() {
let lat = coord.insert(marker.componentsSeparatedByString(",")[i] as NSString).doubleValue, atIndex:[i][0]
let lng = coord.insert(marker.componentsSeparatedByString(",")[i+1] as NSString).doubleValue, atIndex:[i][1]
path.addCoordinate(CLLocationCoordinate2DMake(coord[i][0]))
path.addCoordinate(CLLocationCoordinate2DMake(coord[i][1]))
}

answered Mar 30, 2017 at 18:27

Steffen Lund Andersen

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Comments

nikdange_me · Accepted Answer · 2017-03-30 18:23:45Z

1

    func drawPolygon(){
    var cord: Array<CLLocationCoordinate2D> = []
    let path = GMSMutablePath()
    // get path for polygon
//initailizing i = 0;
    var i = 0
    for marker in markersArray {
    let lat = coord.insert(marker.componentsSeparatedByString(",")[i] as NSString).doubleValue, atIndex:[i][0]
    let lng = coord.insert(marker.componentsSeparatedByString(",")[i+1] as NSString).doubleValue, atIndex:[i][1]
    path.addCoordinate(CLLocationCoordinate2DMake(coord[i][0]))
    path.addCoordinate(CLLocationCoordinate2DMake(coord[i][1]))
//incrementing i with +1
    i = i+1;
    }
    }

answered Mar 30, 2017 at 18:23

nikdange_me

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1 Comment

konyv12 Over a year ago

Thank you so much!

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