iOS-登录发送验证码时60秒倒计时,直接用

__block NSInteger timeout= 60; //倒计时时间

KWeakSelf

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

dispatch_source_t _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); //每秒执行

dispatch_source_set_event_handler(_timer, ^{

if(timeout < 0){ //倒计时结束，关闭

dispatch_source_cancel(_timer);

dispatch_async(dispatch_get_main_queue(), ^{

KStrongSelf

//设置界面的按钮显示 根据自己需求设置

self.getCodeBtn.enabled = YES;

[self.getCodeBtn setTitle:@"获取验证码" forState:UIControlStateNormal];

});

}else{

self.getCodeBtn.enabled = NO;

NSString *strTime = [NSString stringWithFormat:@"%zd秒",timeout];

dispatch_async(dispatch_get_main_queue(), ^{

//设置界面的按钮显示 根据自己需求设置

[self.getCodeBtn setTitle:strTime forState:UIControlStateNormal];

});

timeout--;

}

});

dispatch_resume(_timer);