CODEWITHSUNDEEP
swiftcoordinatestouchscreen
Lukas Köhl
Lukas Köhl

Reputation: 1579

Getting the coordinates from the location I touch the touchscreen

I try to get the coordinates from the location where I hit the touchscreen to do put a specific UIImage at this point.

How can I do this?

Upvotes: 30

Views: 50657

Answers (6)

krjw
krjw

Reputation: 4450

For SwiftUI I created a new swift file called HostingController.swift

import Foundation
import UIKit
import SwiftUI

class HostingController: UIHostingController<ContentView> {

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        if let touch = touches.first {
            let position = touch.location(in: view)
            print(position)
        }
    }
}

Then I changed the following lines of code in the SceneDelegate.swift

window.rootViewController = UIHostingController(rootView: ContentView())

to

window.rootViewController = HostingController(rootView: ContentView())

SwiftUI is basically wrapped in a ViewController via the UIHostingController. At least thats how I think it is.

I hope this helps!

Greetings krjw

Upvotes: 2

Mundi
Mundi

Reputation: 80265

In a UIResponder subclass, such as UIView:

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    let touch = touches.anyObject()! as UITouch
    let location = touch.locationInView(self)
}

This will return a CGPoint in view coordinates.

Updated with Swift 3 syntax

override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
    let touch = touches.first!
    let location = touch.location(in: self)
}

Updated with Swift 4 syntax

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    let touch = touches.first!
    let location = touch.location(in: self.view)
}

Upvotes: 47

vikash kumar
vikash kumar

Reputation: 61

Latest swift4.0, For ViewController

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first {
    let location = touch.location(in: self.view)
    print(location.x)
    print(location.y)
  }
}

Upvotes: 0

Mike Lee
Mike Lee

Reputation: 2639

Swift 4.0

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let position = touch.location(in: view)
        print(position)
    }
}

source

Upvotes: 3

LittleNose
LittleNose

Reputation: 321

Taking this forward for Swift 3 - I'm using:

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if let touch = touches.first {
        let position = touch.location(in: self)
        print(position.x)
        print(position.y)
    }
}

Happy to hear any clearer or more elegant ways to produce the same result

Upvotes: 22

kb920
kb920

Reputation: 3089

This is work in Swift 2.0

override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
    if let touch = touches.first {
        let position :CGPoint = touch.locationInView(view)
        print(position.x)
        print(position.y)

    }
}

Upvotes: 15

Related Questions