iOS封装一个同步倒计时

效果

倒计时.gif

用法

let btn = ZHCountdownButton.init()
btn.maxSec = 5
btn.setTitle("获取验证码2", for: .normal)
btn.setTitleColor(UIColor.red, for: .normal)
btn.sizeToFit()
btn.frame.origin = CGPoint.init(x: 100, y: 100)
btn.addTarget(self, action: #selector(btnClick(sender:)), for: .touchUpInside)

@objc fileprivate func btnClick(sender: ZHCountdownButton) {
        ZHCountdownButton.countdown = true
    }

地址
https://github.com/haoburongyi/ZHCountdownBtn