最近一个项目有获取手机短信跟邮箱验证码功能, 所以要加一个UIButton倒计时功能
例子代码如下:
代码语言：javascript复制 1 //获取验证码按钮
2 - (IBAction)getButtonClick:(UIButton *)sender;
3
4 #pragma mark - 获取验证码
5 - (IBAction)getButtonClick:(UIButton *)sender
6 {
7 //正常状态下的背景颜色
8 UIColor *mainColor = [UIColorcolorWithRed:84/255.0green:180/255.0blue:98/255.0alpha:1.0f];
9 //倒计时状态下的颜色
10 UIColor *countColor = [UIColorlightGrayColor];
11 [selfsetTheCountdownButton:sender startWithTime:5title:@"获取验证码"countDownTitle:@"s"mainColor:mainColor countColor:countColor];
12 }
13
14 #pragma mark - button倒计时
15 - (void)setTheCountdownButton:(UIButton *)button startWithTime:(NSInteger)timeLine title:(NSString *)title countDownTitle:(NSString *)subTitle mainColor:(UIColor *)mColor countColor:(UIColor *)color {
16 //倒计时时间
17 __block NSInteger timeOut = timeLine;
18 dispatch_queue_t queue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);
19 dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER,0, 0, queue);
20 //每秒执行一次
21 dispatch_source_set_timer(_timer,dispatch_walltime(NULL,0), 1.0 * NSEC_PER_SEC,0);
22 dispatch_source_set_event_handler(_timer, ^{
23
24 //倒计时结束，关闭
25 if (timeOut == 0) {
26 dispatch_source_cancel(_timer);
27 dispatch_async(dispatch_get_main_queue(), ^{
28 button.backgroundColor = mColor;
29 [button setTitle:titleforState:UIControlStateNormal];
30 button.userInteractionEnabled =YES;
31 });
32 } else {
33 int seconds = timeOut % 60;
34 NSString *timeStr = [NSStringstringWithFormat:@"%0.1d", seconds];
35 dispatch_async(dispatch_get_main_queue(), ^{
36 button.backgroundColor = color;
37 [button setTitle:[NSStringstringWithFormat:@"%@%@",timeStr,subTitle]forState:UIControlStateNormal];
38 button.userInteractionEnabled =NO;
39 });
40 timeOut--;
41 }
42 });
43 dispatch_resume(_timer);
44 }
