I'm trying to move a label to a random location which I have been able to do so using this code.
let buttonWidth = self.samea.frame.width
let buttonHeight = self.samea.frame.height
// Find the width and height of the enclosing view
let viewWidth = self.samea.superview!.bounds.width
let viewHeight = self.samea.superview!.bounds.height
// Compute width and height of the area to contain the button's center
let xwidth = viewWidth - buttonWidth
let yheight = viewHeight - buttonHeight
// Generate a random x and y offset
let xoffset = CGFloat(arc4random_uniform(UInt32(xwidth)))
let yoffset = CGFloat(arc4random_uniform(UInt32(yheight)))
// Offset the button's center by the random offsets.
self.newButtonX = xoffset + buttonWidth/2
self.newButtonY = yoffset + buttonHeight/2
self.samea.center.x = self.newButtonX!
self.samea.center.y = self.newButtonY!
The problem is, I have some buttons and labels on the storyboard and I do not want the button to spawn on top of those. Not sure how to do that. Any help is appreciated !
You can create an array property of all the UIButton and UILabel outlets that you have, populate it in your viewDidLoad(_:) method. Then when you're generating your random values, you can put them in a while loop and cycle through the values.
Something like this.
let buttonsAndLabels = [UIView]()
var xoffset: CGFloat
var yoffset: CGFloat
var isOccupied = true
while isOccupied {
xoffset = CGFloat(arc4random_uniform(UInt32(xwidth)))
yoffset = CGFloat(arc4random_uniform(UInt32(yheight)))
let frame = CGRect(x: xoffset, y: yoffset, width: buttonWidth, height: buttonHeight)
isOccupied = false
for view in buttonsAndLabels {
if view.frame.intersects(frame) {
isOccupied = true
}
}
}
Related
I have one UIScrollView (IBOutlet) with success constraint inside a storyboard. then I programmatically create UIButton and put them as a subview to UIScrollView. how do I programmatically set these UIButton constraints so their height and size would tally with their super view?
class ViewController: UIViewController {
#IBOutlet weak var aScrollView: UIScrollView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var xCoord: CGFloat = 5
let yCoord: CGFloat = 5
let buttonWidth:CGFloat = 100
let buttonHeight: CGFloat = 100
let gapBetweenButtons: CGFloat = 10
var itemCount = 0
// MARK: - filter buttons
for i in 0..<6 {
itemCount = i
let aButton = UIButton(type: .custom)
aButton.frame = CGRect(x: xCoord, y: yCoord, width: buttonWidth, height: buttonHeight)
aButton.backgroundColor = UIColor.blue
aButton.layer.cornerRadius = aButton.frame.size.width / 2
aButton.clipsToBounds = true
xCoord += buttonWidth + gapBetweenButtons
aScrollView.addSubview(aButton)
}
}
Try this --
This is just an idea about how to add constraint programmatically.
For more understanding you can go through below link - https://developer.apple.com/reference/appkit/nslayoutanchor
let myButton = UIButton()
self.aScrollView.addSubview(myButton)
self.view.translatesAutoresizingMaskIntoConstraints = false
let margins = self.view.layoutMarginsGuide
myButton.leadingAnchor.constraint(equalTo: forView. aScrollView.leadingAnchor, constant: 5).active = true
myButton.topAnchor.constraint(equalTo: forView. aScrollView.topAnchor, constant: 5).active = true
myButton.heightAnchor.constraintEqualToConstant(100.0).active = true
myButton.widthAnchor.constraintEqualToConstant(100.0).active = true
Change your code to:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
var xCoord: CGFloat = 5
let yCoord: CGFloat = 5
let gapBetweenButtons: CGFloat = 10
let buttonCount = 6
let buttonWidth = (aScrollView.frame.width - CGFloat(buttonCount - 1) * gapBetweenButtons - xCoord - xCoord) / CGFloat(buttonCount) // - (2 * xCoord) = - (margin left + margin right).
let buttonHeight = buttonWidth
var itemCount = 0
// MARK: - filter buttons
for i in 0..<buttonCount {
itemCount = i
let aButton = UIButton(type: .custom)
aButton.frame = CGRect(x: xCoord, y: yCoord, width: buttonWidth, height: buttonHeight)
aButton.backgroundColor = UIColor.blue
aButton.layer.cornerRadius = aButton.frame.size.width / 2
aButton.clipsToBounds = true
xCoord += buttonWidth + gapBetweenButtons
aScrollView.addSubview(aButton)
}
}
This is how to do it. I made a video tutorial for you add unbutton programmatically to scrollview in iOS, swift. please refer the link.
add a scrollview (add constraints -> top, bottom, left, right).
then add a view to your scroll view (add constraints -> top, bottom, left, right, width, height and set width and height as you need. explain in the video)
add those two views as subviews.
then add the button and its constraints programmatically.
follow the video tutorial. add UIButton(outlet) to scrollview programmatically
I have an array of buttons and when I append them to a view I want the to be positioned around a image view which is in the center. Based on how many objects there are in the array, I want them to be evenly spaced around the whole circle. Below is my attempt to do so. What am I doing wrong and how should I fix it? There is more than one button behind the moose.
var userbutton = [UIButton]()
var upimage = [UIImage]()
var locationpic = [AnyObject]()
func locationsSet(){
for (index, users) in upimage.enumerate() {
let userbutton = UIButton()
userbutton.addTarget(self, action: "buttonAction:", forControlEvents: .TouchUpInside)
userbutton.frame = CGRectMake(100, 100, 50, 50)
userbutton.layer.cornerRadius = userbutton.frame.size.width/2
userbutton.clipsToBounds = true
userbutton.setImage(users, forState: .Normal)
let radians = CGFloat(M_PI) * 2.0 / CGFloat(upimage.count) * CGFloat(index)
let centerx = self.view.bounds.width / 2.0
let radius = currentuserpic.frame.size.width / 2.0
let centery = self.view.bounds.height / 2.0
let pointx = centerx + cos(radians) * (radius + 40)
let pointy = (centery) + (sin(radians)) * (radius + 40)
userbutton.center.x = pointx
userbutton.center.y = pointy
self.userbutton.append(userbutton)
self.view.addSubview(userbutton)
print("x\(pointx)")
print("y\(pointy)")
}
}
How I would do this:
Create an extension to UIView to get the diagonal and radius. These are handy because we want our "satellites" to have predictable placing even when the "planet" isn't square.
extension UIView {
var diagonal : CGFloat {
return sqrt(pow(self.frame.width, 2) + pow(self.frame.height, 2))
}
var radius : CGFloat {
return diagonal / 2
}
}
This will return a point based on an angle and a distance from an origin.
It uses dreadful trigonometry.
func getPoint(fromPoint point: CGPoint, atDistance distance: CGFloat, withAngleRadians angle:CGFloat) -> CGPoint {
let x = point.x
let y = point.y
let dx = (distance * cos(angle))
let dy = (distance * sin(angle))
return CGPoint(x: (dx + x), y: (dy + y))
}
Now the real function. Generate a bunch of points in a circle pattern. I used a running sum for the angle instead of multiplying each time by the index. This just returns the centre points for the views.
func encirclePoint(point : CGPoint, distance:CGFloat, inParts parts: Int) -> [CGPoint] {
let angle = 2 * CGFloat(M_PI) / CGFloat(parts) // critical part, you need radians for trigonometry
var runningAngle : CGFloat = -(CGFloat(M_PI) / 2) // start at the top
var points : [CGPoint] = []
for _ in 0..<parts {
let circlePoint = getPoint(fromPoint: point, atDistance: distance, withAngleRadians: runningAngle)
points.append(circlePoint)
runningAngle += angle
}
return points
}
Now you can create a simple function that takes a view, a margin and an array of "satellite" views. It will set their centre and add them to the superview of the view we used to input. It makes sense not to add them to the view itself since they might not be placed inside it.
func encircleView(view : UIView, withSubViews subViews : [UIView], withMargin margin : CGFloat) {
guard !(subViews.isEmpty) else { // if there are no subviews : abort
return
}
let distance = view.radius + margin
let points = encirclePoint(view.center, distance: distance, inParts: subViews.count)
guard subViews.count == points.count, let uberView = view.superview else { // if the count is not the same or there is no superview: abort
return
}
for (point, subView) in zip(points, subViews) { subView.center = point }
}
Notice how I did nothing except for the centre calculations in these functions. Styling them goes in another function. This makes it super easy to maintain and debug.
I might even let the last function just return the subviews with updated frames and add them later.
Or negative margin :)
Gist
A full circle is 2 * pi radians. You need to divide that by the number of items you have and multiply that by the index of the item you are currently processing. Use trig to find the location on the circle:
for (index, users) in upimage.enumerate() {
let radians = CGFloat(M_PI) * 2.0 / CGFloat(upimage.count) * CGFloat(index)
......
let centerx = self.view.bounds.width / 2.0
let radius = currentuserpic.frame.size.width / 2.0
let centery = self.view.bounds.height / 2.0
let pointx = centerx + cos(radians) * radius
let pointy = centery + sin(radians) * radius
......
}
I have an array of buttons and when I append them to a view I want the to be positioned around a image view which is in the center. Based on how many objects there are in the array, I want them to be evenly spaced around the whole circle. Below is my attempt to do so. What am I doing wrong and how should I fix it? There is more than one button behind the moose.
var userbutton = [UIButton]()
var upimage = [UIImage]()
var locationpic = [AnyObject]()
func locationsSet(){
for (index, users) in upimage.enumerate() {
let userbutton = UIButton()
userbutton.addTarget(self, action: "buttonAction:", forControlEvents: .TouchUpInside)
userbutton.frame = CGRectMake(100, 100, 50, 50)
userbutton.layer.cornerRadius = userbutton.frame.size.width/2
userbutton.clipsToBounds = true
userbutton.setImage(users, forState: .Normal)
let radians = CGFloat(M_PI) * 2.0 / CGFloat(upimage.count) * CGFloat(index)
let centerx = self.view.bounds.width / 2.0
let radius = currentuserpic.frame.size.width / 2.0
let centery = self.view.bounds.height / 2.0
let pointx = centerx + cos(radians) * (radius + 40)
let pointy = (centery) + (sin(radians)) * (radius + 40)
userbutton.center.x = pointx
userbutton.center.y = pointy
self.userbutton.append(userbutton)
self.view.addSubview(userbutton)
print("x\(pointx)")
print("y\(pointy)")
}
}
How I would do this:
Create an extension to UIView to get the diagonal and radius. These are handy because we want our "satellites" to have predictable placing even when the "planet" isn't square.
extension UIView {
var diagonal : CGFloat {
return sqrt(pow(self.frame.width, 2) + pow(self.frame.height, 2))
}
var radius : CGFloat {
return diagonal / 2
}
}
This will return a point based on an angle and a distance from an origin.
It uses dreadful trigonometry.
func getPoint(fromPoint point: CGPoint, atDistance distance: CGFloat, withAngleRadians angle:CGFloat) -> CGPoint {
let x = point.x
let y = point.y
let dx = (distance * cos(angle))
let dy = (distance * sin(angle))
return CGPoint(x: (dx + x), y: (dy + y))
}
Now the real function. Generate a bunch of points in a circle pattern. I used a running sum for the angle instead of multiplying each time by the index. This just returns the centre points for the views.
func encirclePoint(point : CGPoint, distance:CGFloat, inParts parts: Int) -> [CGPoint] {
let angle = 2 * CGFloat(M_PI) / CGFloat(parts) // critical part, you need radians for trigonometry
var runningAngle : CGFloat = -(CGFloat(M_PI) / 2) // start at the top
var points : [CGPoint] = []
for _ in 0..<parts {
let circlePoint = getPoint(fromPoint: point, atDistance: distance, withAngleRadians: runningAngle)
points.append(circlePoint)
runningAngle += angle
}
return points
}
Now you can create a simple function that takes a view, a margin and an array of "satellite" views. It will set their centre and add them to the superview of the view we used to input. It makes sense not to add them to the view itself since they might not be placed inside it.
func encircleView(view : UIView, withSubViews subViews : [UIView], withMargin margin : CGFloat) {
guard !(subViews.isEmpty) else { // if there are no subviews : abort
return
}
let distance = view.radius + margin
let points = encirclePoint(view.center, distance: distance, inParts: subViews.count)
guard subViews.count == points.count, let uberView = view.superview else { // if the count is not the same or there is no superview: abort
return
}
for (point, subView) in zip(points, subViews) { subView.center = point }
}
Notice how I did nothing except for the centre calculations in these functions. Styling them goes in another function. This makes it super easy to maintain and debug.
I might even let the last function just return the subviews with updated frames and add them later.
Or negative margin :)
Gist
A full circle is 2 * pi radians. You need to divide that by the number of items you have and multiply that by the index of the item you are currently processing. Use trig to find the location on the circle:
for (index, users) in upimage.enumerate() {
let radians = CGFloat(M_PI) * 2.0 / CGFloat(upimage.count) * CGFloat(index)
......
let centerx = self.view.bounds.width / 2.0
let radius = currentuserpic.frame.size.width / 2.0
let centery = self.view.bounds.height / 2.0
let pointx = centerx + cos(radians) * radius
let pointy = centery + sin(radians) * radius
......
}
I have been doing it great with the answer in this question:
Strange #IBAction conflict or bug? (Swift)
But since I put iAds, the random position stop working that well, now the button is showed sometimes at his real place in Main.storyboard and sometimes at a random place inside the screen, this is only when iAd is showing
here is the code:
var newButtonX: CGFloat?
var newButtonY: CGFloat?
#IBAction func buttonPressed(sender: AnyObject) {
let buttonWidth = button.frame.width
let buttonHeight = button.frame.height
// Find the width and height of the enclosing view
let viewWidth = button.superview!.bounds.width
let viewHeight = button.superview!.bounds.height
// Compute width and height of the area to contain the button's center
let xwidth = viewWidth - buttonWidth
let yheight = viewHeight - buttonHeight
// Generate a random x and y offset
let xoffset = CGFloat(arc4random_uniform(UInt32(xwidth)))
let yoffset = CGFloat(arc4random_uniform(UInt32(yheight)))
// Offset the button's center by the random offsets.
newButtonX = xoffset + buttonWidth / 2
newButtonY = yoffset + buttonHeight / 2
circle.center.x = newButtonX!
circle.center.y = newButtonY!
}
override func viewDidLayoutSubviews() {
if let buttonX = newButtonX {
button.center.x = buttonX
}
if let buttonY = newButtonY {
button.center.y = buttonY
}
}
Just solve it, I use the iAd bannerview on the Main.storyboard and now it works fine
I'm creating a very simple app for iPhone.
Just don't know how to make the button (image) move to random position (but on the screen) when it's touched, in Swift.
I'm using Xcode 6.
Use this for the #IBAction of your button:
#IBAction func moveButton(button: UIButton) {
// Find the button's width and height
let buttonWidth = button.frame.width
let buttonHeight = button.frame.height
// Find the width and height of the enclosing view
let viewWidth = button.superview!.bounds.width
let viewHeight = button.superview!.bounds.height
// Compute width and height of the area to contain the button's center
let xwidth = viewWidth - buttonWidth
let yheight = viewHeight - buttonHeight
// Generate a random x and y offset
let xoffset = CGFloat(arc4random_uniform(UInt32(xwidth)))
let yoffset = CGFloat(arc4random_uniform(UInt32(yheight)))
// Offset the button's center by the random offsets.
button.center.x = xoffset + buttonWidth / 2
button.center.y = yoffset + buttonHeight / 2
}
Warning: If you have AutoLayout enabled, your button could snap back to its original location when the subviews are laid out. See the solution to this problem here.