下面一段代码给大家分享swift 3.0 实现短信验证码倒计时功能，具体实例代码如下所示：
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class TCCountDown {
private var countdownTimer: Timer?
var codeBtn = UIButton()
private var remainingSeconds: Int = 0 {
willSet {
codeBtn.setTitle("重新获取\(newValue)秒", for: .normal)
if newValue <= 0 {
codeBtn.setTitle("获取验证码", for: .normal)
isCounting = false
}
}
}
var isCounting = false {
willSet {
if newValue {
countdownTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.updateTime), userInfo: nil, repeats: true)
remainingSeconds = 60
codeBtn.setTitleColor(BtnCodeColor, for: .normal)
} else {
countdownTimer?.invalidate()
countdownTimer = nil
codeBtn.setTitleColor(MainColor, for: .normal)
}
codeBtn.isEnabled = !newValue
}
}
@objc private func updateTime() {
remainingSeconds -= 1
}
}
//调用方法
var countDown = TCCountDown()//实例化
countDown.isCounting = true//开启倒计时
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以上所述是小编给大家介绍的swift 3.0 实现短信验证码倒计时功能，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持！
原文链接：http://blog.csdn.net/qq_25592881/article/details/56671945