显示具有不同时间的多个警报

Question

显示来自核心数据的不同时间不同消息的警报。我试过这段代码 显示警报2秒3秒，4秒等...

 if (fetchedObjectsData.count > 0) {
    NSLog(@"Return data Count is ====== %lu",(unsigned long)[fetchedObjectsData count]);

    for (int i=0; i <[fetchedObjectsData count] ; i++)
    {
        NSManagedObject *firstManagedObject = (NSManagedObject *)[fetchedObjectsData objectAtIndex:i];
        NSString * distance = [firstManagedObject valueForKey:@"distance"];
        NSString * typeAlert = [firstManagedObject valueForKey:@"type"];
        NSString * displayTime = [firstManagedObject valueForKey:@"display_time"];
        NSString * content = [firstManagedObject valueForKey:@"content"];
        NSString * title = [firstManagedObject valueForKey:@"title"];
        NSLog(@"How much time you here === %d",i);

    if ([distance intValue]>=0 && [distance intValue]<5)
    {
        if ([typeAlert isEqualToString:@"1"]&& [displayTime isEqualToString:@"0"])
        {
            NSLog(@"typeAlert 1 0 === %d",i);

        }
       if ([typeAlert isEqualToString:@"1"]&& ![displayTime isEqualToString:@"0"])
       {
            NSLog(@"typeAlert 1 1 === %d",i);

           dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, [displayTime intValue] * NSEC_PER_SEC);
           dispatch_after(popTime, dispatch_get_main_queue(), ^(void){

               UIAlertController *alertController = [UIAlertController
                                                     alertControllerWithTitle:title
                                                     message:content
                                                     preferredStyle:UIAlertControllerStyleAlert];

               [self.window.rootViewController presentViewController:alertController animated:YES completion:nil];
           });


       }}}

}else {

    NSLog(@"there's no  with same id. Use insert method");
}

在app delegate类上显示这些警报 标题和消息来自核心数据表

我需要一个接一个地显示警报，就像2秒警报显示之后的下一个警报一样，在3秒内停留