ios 简单的倒计时验证码数秒过程实现

1. timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFireMethod:) userInfo:nil repeats:YES];

1. //倒计时方法验证码实现倒计时60秒，60秒后按钮变换开始的样子
2. -(void)timerFireMethod:(NSTimer *)theTimer {
3. if (seconds == 1) {
4. [theTimer invalidate];
5. seconds = 60;
6. [validCodeBtn_ setTitle:@"获取验证码" forState: UIControlStateNormal];
7. [validCodeBtn_ setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
8. [validCodeBtn_ setEnabled:YES];
9. }else{
10. seconds--;
11. NSString *title = [NSString stringWithFormat:MSG_DYNAMIC_CODE_WAIT,seconds];
12. [validCodeBtn_ setTitleColor:[UIColor grayColor] forState:UIControlStateNormal];
13. [validCodeBtn_ setEnabled:NO];
14. [validCodeBtn_ setTitle:title forState:UIControlStateNormal];
15. }
16. }
17. //如果登陆成功，停止验证码的倒数，
18. - (void)releaseTImer {
19. if (timer) {
20. if ([timer respondsToSelector:@selector(isValid)]) {
21. if ([timer isValid]) {
22. [timer invalidate];
23. seconds = 60;
24. }
25. }
26. }
27. }