[英]How do I change a play button to a pause button when tapped on?
轻按时,我需要将播放按钮更改为暂停按钮,反之亦然。 我对此还很.swift
,所以我不知道如何识别.swift
文件中的按钮或如何以编程方式在.swift
文件中更改图标。
import UIKit
import AVFoundation
class ViewController: UIViewController {
var player = AVAudioPlayer()
var toggleState = 1
@IBAction func playPauseButton(sender: AnyObject) {
if toggleState == 1 {
player.play()
toggleState = 2
} else {
player.pause()
toggleState = 1
}
}
@IBAction func stopButton(sender: AnyObject) {
player.stop()
player.currentTime = 0
}
@IBAction func sliderChanged(sender: AnyObject) {
player.volume = sliderValue.value
}
@IBOutlet weak var sliderValue: UISlider!
override func viewDidLoad() {
super.viewDidLoad()
var audioPath = NSBundle.mainBundle().pathForResource("StarWars", ofType: "mp3")!
var error: NSError?
player = AVAudioPlayer(contentsOfURL: NSURL(string: audioPath), error: &error)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
您可以根据状态更改按钮的图像:
@IBAction func playPauseButton(sender: AnyObject) {
var playBtn = sender as UIButton
if toggleState == 1 {
player.play()
toggleState = 2
playBtn.setImage(UIImage(named:"pause.png"),forState:UIControlState.Normal)
} else {
player.pause()
toggleState = 1
playBtn.setImage(UIImage(named:"play.png"),forState:UIControlState.Normal)
}
}
传递给playPauseButton
的sender
对象是您的UIButton,它调用该方法。 因为它是作为AnyObject
类型的对象发送的, AnyObject
我们将其AnyObject
转换为UIButton
。 如果您不想AnyObject
,并且确定只有UIButton会调用此方法,则可以在function参数中简单地将AnyObject
替换为UIButton
。
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