应用在后台时短信倒计时继续运行
把应用放置后台,短信验证码的倒计时继续运行的方法
button的点击事件里写{
[sender startTimer];//倒计时开始
}
- (void)startTimer
{
__blockint timeout = Timeout;//倒计时时间
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);//每秒执行
dispatch_source_set_event_handler(_timer, ^{
if(timeout<=0){//倒计时结束，关闭
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
//设置界面的按钮显示根据自己需求设置
[selfsetTitle:@"发送验证码"forState:UIControlStateNormal];
[selfsetTitleColor:[RGBColorcolorWithHexString:@"282828"]forState:(UIControlStateNormal)];
self.layer.borderColor = [RGBColorcolorWithHexString:@"52a6f1"].CGColor;
self.userInteractionEnabled =YES;
});
}
else{
// int minutes = timeout / 60;
int seconds = timeout %1000;
NSString *strTime = [NSStringstringWithFormat:@"%.2d", seconds];
dispatch_async(dispatch_get_main_queue(), ^{
//设置界面的按钮显示根据自己需求设置
NSLog(@"____%@",strTime);
[selfsetTitle:[NSStringstringWithFormat:@"%@S",strTime]forState:UIControlStateNormal];
[selfsetTitleColor:[RGBColorcolorWithHexString:@"999999"]forState:(UIControlStateNormal)];
self.layer.borderColor = [RGBColorcolorWithHexString:@"999999"].CGColor;
self.userInteractionEnabled =NO;
});
timeout--;
}
});
dispatch_resume(_timer);
}
在AppDelegate.m的这个方法里面加入如下代码,如果不写的话,倒计时在应用放置后台时就会停止,
- (void)applicationDidEnterBackground:(UIApplication *)application {
UIApplication* app = [UIApplicationsharedApplication];
__block UIBackgroundTaskIdentifier bgTask;
bgTask = [app beginBackgroundTaskWithExpirationHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
if (bgTask !=UIBackgroundTaskInvalid)
{
bgTask = UIBackgroundTaskInvalid;
}
});
}];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), ^{
dispatch_async(dispatch_get_main_queue(), ^{
if (bgTask !=UIBackgroundTaskInvalid)
{
bgTask = UIBackgroundTaskInvalid;
}
});
});
}
应用进入后台时,短信倒计时仍然继续