//驗證碼倒計時
- (void)startTime {
__block int timeout= 59; //倒計時時間
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); //每秒執行
dispatch_source_set_event_handler(_timer, ^{
if (timeout <= 0) { //倒計時結束，關閉
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
//設置界面的按鈕顯示 根據自己需求設置
[_codeButton setTitle:@"獲取驗證碼" forState:UIControlStateNormal];
_codeButton.userInteractionEnabled = YES;
});
} else {
// int minutes = timeout / 60;
int seconds = timeout % 60;
NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];
dispatch_async(dispatch_get_main_queue(), ^{
//設置界面的按鈕顯示 根據自己需求設置
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[_codeButton setTitle:[NSString stringWithFormat:@"%@秒重發",strTime] forState:UIControlStateNormal];
[UIView commitAnimations];
_codeButton.userInteractionEnabled = NO;
});
timeout--;
}
});
dispatch_resume(_timer);
}
- (void)getCodeAction:(UIButton *)sender {
// 解決按鈕短時間內多次點擊只觸發一次事件方法
[[self class] cancelPreviousPerformRequestsWithTarget:self selector:@selector(startTime) object:_codeButton];
[self performSelector:@selector(startTime) withObject:_codeButton afterDelay:0.2f];
}
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