[英]UIImageView image change delay when tapped
我有一個帶有點擊手勢識別器的UIImageView。 點擊時,我希望UIImageView在2張圖像之間交替顯示。 我擁有的代碼可以實現這一點,但是當UIImageView很快被反復輕按時,UIImageView似乎會滯后並落后。
我的代碼:
@IBOutlet weak var moneyButton: UIImageView!
let benchUpImage = UIImage(named: "benchUp")
let benchDownImage = UIImage(named: "benchDown")
var benchIsDown = false
func moneyButtonPressed(sender: UITapGestureRecognizer){
if benchIsDown == false{
moneyButton.image = benchDownImage
benchIsDown = true
}else{
moneyButton.image = benchUpImage
benchIsDown = false
}
}
斯威夫特3.0
您可以簡單地允許用戶稍稍延遲一下。 考慮將代碼替換為以下代碼之一
var canUserTap = true
let delayTime = 0.4 //setDelayTimming in seconds
@IBAction func moneyButtonPressed( _ sender : UITapGestureRecognizer){
if(canUserTap){
if benchIsDown == false{
moneyButton.image = benchDownImage
benchIsDown = true
}else{
moneyButton.image = benchUpImage
benchIsDown = false
}
canUserTap = false
Timer.scheduledTimer(timeInterval: delayTime,
target:self,
selector:#selector(allowUserTap(_:)),
userInfo:nil,
repeats:false)
}
}
func allowUserTap(_ timer:Timer){
canUserTap = true
}
我認為您的代碼存在的問題是您不處理識別器的狀態。 因此,多次輕擊可以使圖像在每種狀態(開始,結束等)都發生變化。 嘗試僅將更改的代碼置於狀態“ end”:
func moneyButtonPressed(sender: UITapGestureRecognizer){
if sender.state == .Ended {
if benchIsDown == false{
moneyButton.image = benchDownImage
benchIsDown = true
}else{
moneyButton.image = benchUpImage
benchIsDown = false
}
}
}
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