使用GCD機(jī)制來實(shí)現(xiàn)倒計(jì)時(shí)功能贱勃。實(shí)現(xiàn)的是類似注冊(cè)頁(yè)面發(fā)送驗(yàn)證碼的倒計(jì)時(shí)。
- (void)getCodeSuccess
{
__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 _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(zhí)行
dispatch_source_set_event_handler(_timer, ^{
if(timeout<=0){ //倒計(jì)時(shí)結(jié)束纹安，關(guān)閉
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
//設(shè)置界面的按鈕顯示 根據(jù)自己需求設(shè)置
[_BTN_code setBackgroundImage:[UIImage imageNamed:@"send_yanzhengma"] forState:UIControlStateNormal];
[_BTN_code setTitle:@"發(fā)送驗(yàn)證碼" forState:UIControlStateNormal];
_BTN_code.userInteractionEnabled = YES;
});
}else{
// int minutes = timeout / 60;
int seconds = timeout % 60;
NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];
dispatch_async(dispatch_get_main_queue(), ^{
//設(shè)置界面的按鈕顯示 根據(jù)自己需求設(shè)置
NSLog(@"____%@秒",strTime);
[_BTN_code setBackgroundImage:[UIImage imageNamed:@"send_yanzhengma"] forState:UIControlStateNormal];
[_BTN_code setTitle:[NSString stringWithFormat:@"%@秒后重新發(fā)送",strTime] forState:UIControlStateNormal];
_BTN_code.userInteractionEnabled = NO;
});
timeout--;
}
});
dispatch_resume(_timer);
}
