CODEWITHSUNDEEP
iosiphoneswiftuibuttonuiviewanimation
Garret Kaye
Garret Kaye

Reputation: 2562

How to make a button disappear when it is tapped while it is animating

I created a button and set some animations too it but now I can not tap it or interact with it while it is in motion and if it lets me tap it I get an error. My goal is to make the button disappear while it is moving when you click on it. Please help!! Thanks in advance!

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    // Create button
    let button   = UIButton.buttonWithType(UIButtonType.System) as UIButton
    button.frame = CGRectMake(100, 100, 100, 100)
    button.setTitle("Test Button", forState: UIControlState.Normal)
    button.addTarget(self, action: "buttonAction", forControlEvents: UIControlEvents.TouchUpInside)

    self.view.addSubview(button)

    UIView.animateWithDuration(4, delay: 3, options: UIViewAnimationOptions.AllowUserInteraction | UIViewAnimationOptions.LayoutSubviews | UIViewAnimationOptions.Autoreverse, animations: {
        button.frame = CGRectMake(100, 300, 100, 100)
        }, completion: nil)

    // Create a function that makes the button dissapear when it is tapped
    func buttonAction() {

        button.alpha = 0
    }

}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

Upvotes: 0

Views: 1483

Answers (4)

Marco
Marco

Reputation: 324

Perhaps you could track if your object is moving using a boolean variable.

Then, try using "hidden" a property of button:

var moving: Bool!

if moving == true {
        button.hidden = true
    } else {
        button.hidden = false
    }

Hope you can figure it out.

Upvotes: 0

rdelmar
rdelmar

Reputation: 104082

You can't use animateWithDuration to animate your button's position if you want to interact with it while it moves. The touch point of the button actually moves immediately to the final position (you can touch there when it's in motion, and you will see that it calls its action method). You need to use a timer (or a CADisplayLink) to incrementally move your button with each call.

Also, as others have pointed out, you need to change your button's action to "buttonAction:" so the button will send itself as the argument. You can use a CADisplayLink like so,

import UIKit

class ViewController: UIViewController {

    var button: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()

        button = UIButton.buttonWithType(UIButtonType.System) as UIButton
        button.frame = CGRectMake(100, 100, 100, 100)
        button.setTitle("Test Button", forState: UIControlState.Normal)
        button.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)

        self.view.addSubview(button)

        var displayLink = CADisplayLink(target: self, selector: "handleDisplayLink:")
        displayLink.addToRunLoop(NSRunLoop.currentRunLoop(), forMode: NSDefaultRunLoopMode)
    }


    func handleDisplayLink(displayLink: CADisplayLink) {
        var buttonFrame = button.frame
        buttonFrame.origin.y += 1
        button.frame = buttonFrame
        if button.frame.origin.y >= 300 {
            displayLink.invalidate()
        }
    }


    func buttonAction(sender: UIButton) {
        sender.alpha = 0
    }

}

Upvotes: 0

salabaha
salabaha

Reputation: 2478

In order to fix crash you are having you need to move buttonAction func out of viewDidLoad scope and modify it like this: 

func buttonAction(button: UIButton) {

    button.alpha = 0
}

Also you need to change button.addTarget(...) param action from this "buttonAction" to this "buttonAction:". See code below

button.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)

Upvotes: 2

Sir Godart
Sir Godart

Reputation: 33

You will have to create an outlet by 'ctrl + drag' your button from IB to your ViewController. Next you can create an IBaction() function.

@IBAction func likedThis(sender: UIButton) {
//your code
}

The code you put inside this function will automatically be triggered when you press the button.

Upvotes: 0

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