I am having trouble creating a function "touchesBegan" and then creating a UIPoint and UITouch constant or variable that holds an x and y coordinate. I have the exact code I want in Objective-C but I do not know what it's equivalent is in Swift. Here is the Objective-C code which I want to basically translate into Swift code...
NOTE: This is a Single View Application, NOT a game... Thanks in advance.
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
UITouch *touch = [touches anyObject];
CGPoint point = [touch locationInView:self.view];
if (point.x < 160) {
var = 10;
}
else{
var = 20;
}
}
As of Swift 1.2, use this
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent)
{
var touch = touches.first as! UITouch
var point = touch.locationInView(self)
if point.x < 160 {
var = 10;
}
else{
var = 20;
}
}
Where's the problem?
var touch = touches.anyObject() as! UITouch
var point = touch.locationInView(self.view)
if point.x < 160 {
var variableName = 10;
}
else{
var variableName = 20;
}
Swift 1.2 changed the syntax for touchesBegan. See the UIResponder Reference.
func touchesBegan(_ touches: Set<NSObject>, withEvent event: UIEvent)
And don't forget to reference the super.
super.touchesBegan(touches, withEvent: event)
Here is an edited example of implementing this code from techotopia.com which might give you more information on the other three touches functions.
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
var touch = touches.anyObject() as! UITouch
var point = touch.locationInView(self.view)
// Insert if statements
super.touchesBegan(touches, withEvent: event)
}
Related
My code:
var location = CGPoint(x:0,y:0)
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch = touches.anyObject() as? UITouch
location = touch.locationInView(self.view)
Button.center = location
}
Gives an error on this line:
let touch = touches.anyObject() as? UITouch
How to fix it?
Try this : -
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
for touch in touches {
if let touch = touches.first as? UITouch {
if touch.tapCount == 2{
//Do Something here
}
}
}
}
try this
if let touch = touches.first as? UITouch
{
}
I have a label called date2 and I want to drag him only to right or left.
I have got 2 issues - first - I have copied a code by the internet but the Xcode show a bug:
#IBOutlet var date2: UILabel!
var location = CGPoint(x: 0, y: 0)
override func touchesBegan(touches: NSSet, withEvent event: UIEvent?) {
let touch : UITouch! = touches.anyObject() as! UITouch
location = touch.locationInView(self.view)
date2.center = location
}
The second thing is - that the code is to move the label anywhere and not only to the right and left.
Try this code.
#IBOutlet var date2: UILabel!
override func touchesBegan(touches: NSSet, withEvent event: UIEvent?) {
let touch : UITouch! = touches.anyObject() as UITouch
var location = date2.center
location.x = touch.locationInView(self.view).x
date2.center = location
}
I think it solves ur both issues.
When I scroll through on this scene with my code, it is extremely glitchy looking. Everything kind of jumps around very quickly until you let go. Is there a better way of doing this?
var lastTouch: CGPoint!
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch : UITouch = touches.first!
lastTouch = touch.locationInNode(self)
}
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch : UITouch = touches.first!
let touchLocation : CGPoint = touch .locationInNode(self)
self.camera!.position = CGPointMake(self.camera!.position.x + (lastTouch!.x - touchLocation.x), self.camera!.position.y + (lastTouch!.y - touchLocation.y))
lastTouch = touchLocation;
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
let touch : UITouch = touches.first!
let touchLocation : CGPoint = touch .locationInNode(self)
self.camera!.position = CGPointMake(self.camera!.position.x + (lastTouch!.x - touchLocation.x), self.camera!.position.y + (lastTouch!.y - touchLocation.y))
print(touches.count)
lastTouch = touchLocation;
}
I can upload a gif/video if really necessary. Is this just a bug with SKCameraNode as it is so new? If anyone knows what I am doing wrong I'd love to hear. Thanks!
EDIT: Click here to see a video of the issue
I have found the answer, as it was a very simple mistake. As the camera node moved, the location in which you are touching would also move. I created a node that moves with the camera and get the touch's location in that node.
I'm trying to get the coordinates of a touch on the screen, but every time it just gives me 0, 0. I could only find basic help with this function in the new version of Swift, and nothing on this problem. What am I doing wrong here?
override func touchesEnded(touches: Set<NSObject>, withEvent event: UIEvent) {
let touch = touches.first as! UITouch
let location = touch.locationInView(self.view)
NSLog("location: %d, %d", location.x, location.y)
}
Thanks!
As per swift 1.2
override func touchesEnded(touches: Set<NSObject>!, withEvent event: UIEvent!) {
if let touch = touches.first as? UITouch {
let location = touch.locationInView(self.view)
println("Location: \(location)")
}
}
As per swift 1.1
override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
let touch = touches.anyObject() as? UITouch
let location = touch?.locationInView(self.view)
println("Location: \(location)")
}
Tested.
I'm trying to pick up a bit of Swift lang and I'm wondering how to convert the following Objective-C into Swift:
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[super touchesBegan:touches withEvent:event];
UITouch *touch = [touches anyObject];
if ([touch.view isKindOfClass: UIPickerView.class]) {
//your touch was in a uipickerview ... do whatever you have to do
}
}
More specifically I need to know how to use isKindOfClass in the new syntax.
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
???
if ??? {
// your touch was in a uipickerview ...
}
}
The proper Swift operator is is:
if touch.view is UIPickerView {
// touch.view is of type UIPickerView
}
Of course, if you also need to assign the view to a new constant, then the if let ... as? ... syntax is your boy, as Kevin mentioned. But if you don't need the value and only need to check the type, then you should use the is operator.
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
super.touchesBegan(touches, withEvent: event)
let touch : UITouch = touches.anyObject() as UITouch
if touch.view.isKindOfClass(UIPickerView)
{
}
}
Edit
As pointed out in #Kevin's answer, the correct way would be to use optional type cast operator as?. You can read more about it on the section Optional Chaining sub section Downcasting.
Edit 2
As pointed on the other answer by user #KPM, using the is operator is the right way to do it.
You can combine the check and cast into one statement:
let touch = object.anyObject() as UITouch
if let picker = touch.view as? UIPickerView {
...
}
Then you can use picker within the if block.
I would use:
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
super.touchesBegan(touches, withEvent: event)
let touch : UITouch = touches.anyObject() as UITouch
if let touchView = touch.view as? UIPickerView
{
}
}
Another approach using the new Swift 2 syntax is to use guard and nest it all in one conditional.
guard let touch = object.AnyObject() as? UITouch, let picker = touch.view as? UIPickerView else {
return //Do Nothing
}
//Do something with picker