Question

我花了一半的时间阅读所有“如何取消本地通知”的问题和答案。毕竟，我提出了自己的解决方案，但显然它无法正常工作。我有一个包含所有预定通知的tableview ....

在H文件上我有

@property (strong, nonatomic) UILocalNotification *theNotification;

然后在M文件上：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSArray *notificationArray = [[UIApplication sharedApplication] scheduledLocalNotifications];
    theNotification = [notificationArray objectAtIndex:indexPath.row];
    NSLog(@"Notification to cancel: %@", [theNotification description]); 
    // NSLOG Perfectly describes the notification to be cancelled. But then It will give me      "unrecognized selector"


    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Local Reminder"
                                                    message:@"Cancel local reminder ?"
                                                   delegate:self
                                          cancelButtonTitle:@"No"
                                          otherButtonTitles:@"Yes", nil];
    [alertView show];
    [alertView release];    
    [self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    if (buttonIndex == 0) {
        NSLog(@"Cancel");
    }else{ 
        NSLog(@"Ok");
        [[UIApplication sharedApplication] cancelLocalNotification:theNotification];
    }
}

如果我点击“确定”，我会得到： 2012-02-04 03：34：48.806第三次测试[8921：207] - [__ NSCFType encodeWithCoder：]：无法识别的选择器发送到实例0x890ae90 程序收到信号“SIGABRT”。

如果我能完全确定要取消的通知，为什么会给我这个？

Answer 1

在我的应用中，我这样做了：

- (IBAction)cancelLocalNotification:(id)sender 
{
    for (UILocalNotification *lNotification in [[UIApplication sharedApplication] scheduledLocalNotifications]) 
    {
        if ([[lNotification.userInfo valueForKey:@"FlightUniqueIDKey"] isEqualToString:flightNo]) 
        {
            [[UIApplication sharedApplication] cancelLocalNotification:lNotification];
        }
    }
}

当我安排本地通知时，我添加了一个密钥。 FlightNo是通知的唯一ID。

NSDictionary *infoDict = [NSDictionary dictionaryWithObject:flightNo forKey:@"FlightUniqueIDKey"];

localNotif.userInfo = infoDict;

Nick Farina的注释：这仅适用于预定通知;您似乎无法取消通过presentLocalNotificationNow提供的通知：

Answer 2

我发现了一种让它看起来更好一点的方法。如果要直接从表中删除localNotification，可以为每个单元格添加“取消”或“删除”按钮。像这样：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
NSArray *notificationArray = [[UIApplication sharedApplication] scheduledLocalNotifications];
UILocalNotification *notif = [notificationArray objectAtIndex:indexPath.row];
[cell.textLabel setText:notif.alertBody];

NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"MM/ d/ YYYY"];
NSString *dateOnRecord = [dateFormat stringFromDate:notif.fireDate];

[cell.detailTextLabel setText:dateOnRecord];

UIButton *cancelButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
cancelButton.frame = CGRectMake(200, 5, 80, 34);
[cancelButton setTitle:@"Cancel" forState:UIControlStateNormal];

cancelButton.titleLabel.textColor = [UIColor redColor];
cancelButton.backgroundColor = [UIColor colorWithRed:0.5 green:0.0 blue:0.0 alpha:1.0];
[cancelButton setTag:indexPath.row];
[cancelButton addTarget:self action:@selector(cancelNotification:) forControlEvents:UIControlEventTouchUpInside];
[cell.contentView addSubview:cancelButton];
[dateFormat release];
return cell;
}

然后你编码你的按钮：

-(void)cancelNotification:(id)sender {
NSArray *notificationArray = [[UIApplication sharedApplication] scheduledLocalNotifications];
UILocalNotification *notif = [notificationArray objectAtIndex:[sender tag]];
[[UIApplication sharedApplication] cancelLocalNotification:notif];
[self.tableView reloadData];
}

这只是另一种方式。对我来说似乎有点可视化。

取消本地通知无效

2 个答案: