代碼示例 簡(jiǎn)單粗暴 直接用就可以了 :)
- (void)startTime:(UIButton *)button
{
__block int timeout = 60; //倒計(jì)時(shí)時(shí)間
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t timeNew = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue);
dispatch_source_set_timer(timeNew, dispatch_walltime(NULL, 0), 1.0 * NSEC_PER_SEC, 0); //每秒執(zhí)行
dispatch_source_set_event_handler(timeNew, ^{
if (timeout <= 0) { //倒計(jì)時(shí)結(jié)束，關(guān)閉
dispatch_source_cancel(timeNew);
dispatch_async(dispatch_get_main_queue(), ^{
[button setTitle:@"獲取驗(yàn)證碼" forState:UIControlStateNormal];
button.userInteractionEnabled = YES;
button.backgroundColor = [UIColor colorWithRed:44/256.0 green:136/256.0 blue:242/256.0 alpha:1];
});
} else {
NSString *strTime = [NSString stringWithFormat:@"%.2d", timeout];
dispatch_async(dispatch_get_main_queue(), ^{
[button setTitle:[NSString stringWithFormat:@"獲取驗(yàn)證碼(%@)", strTime] forState:UIControlStateNormal];
button.userInteractionEnabled = NO;
});
timeout--;
}
});
dispatch_resume(timeNew);
}
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