在app 注册或者登录 需要验证码的地方、为了避免短时间内刷验证码、往往会加上一层验证。
倒计时结束后、可以重新获取!
代码实现如下:
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// _countdowntime 倒计时总时间;
//_timer 定时器
- ( void )starttime:(uibutton *)verificationcodebutton
{
__block nsinteger timeout = [_countdowntime integervalue];
dispatch_queue_t queue = dispatch_get_global_queue(dispatch_queue_priority_default, 0);
_timer= dispatch_source_create(dispatch_source_type_timer, 0, 0,queue);
dispatch_source_set_timer(_timer,dispatch_walltime(null, 0),1.0*nsec_per_sec, 0);
dispatch_source_set_event_handler(_timer, ^{
if (timeout<=0){
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
[verificationcodebutton settitle:@ "重新获取" forstate:uicontrolstatenormal];
verificationcodebutton.userinteractionenabled = yes;
verificationcodebutton.alpha = 1.0;
verificationcodebutton.backgroundcolor = [uicolor whitecolor];
});
} else {
nsstring *strtime = [nsstring stringwithformat:@ "%lds" , ( long )timeout];
dispatch_async(dispatch_get_main_queue(), ^{
[verificationcodebutton settitle:strtime forstate:uicontrolstatenormal];
verificationcodebutton.userinteractionenabled = no;
verificationcodebutton.backgroundcolor = [uicolor lighttextcolor];
});
timeout--;
}
});
dispatch_resume(_timer);
}
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总结
以上所述是小编给大家介绍的ios 验证码按钮倒计时功能,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://www.cnblogs.com/jukaiit/archive/2017/07/26/7238829.html