下面一段代碼給大家分享swift/172288.html">swift 3.0 實現短信驗證碼倒計時功能，具體實例代碼如下所示：
class TCCountDown {private var countdownTimer: Timer?var codeBtn = UIButton()private var remainingSeconds: Int = 0 { willSet { codeBtn.setTitle("重新獲取/(newValue)秒", for: .normal) if newValue <= 0 { codeBtn.setTitle("獲取驗證碼", 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} } //調用方法 var countDown = TCCountDown()//實例化 countDown.isCounting = true//開啟倒計時以上所述是小編給大家介紹的swift 3.0 實現短信驗證碼倒計時功能，希望對大家有所幫助，如果大家有任何疑問請給我留言，小編會及時回復大家的。在此也非常感謝大家對VEVB武林網網站的支持！
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