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：
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
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脚本之家网站的支持！
