Iphone 更改已设置的UILocalNotification的声音名称

对于尚未创建的通知（新通知），它会被更改，但是对于已经创建的通知，以前的声音会保持不变

我试过：

NSString *soundName = cell.titleLabel.text;

NSArray *notifications = [[UIApplication sharedApplication] scheduledLocalNotifications];

for (UILocalNotification *notif in notifications) {
    notif.soundName = [NSString stringWithFormat:@"%@.mp3", soundName];
}

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但它不起作用…

您必须重新安排已安排的通知。但是，请确保删除先前计划的项目

NSArray *notifications = [[UIApplication sharedApplication] scheduledLocalNotifications];
[[UIApplication sharedApplication] cancelAllLocalNotifications];

for (UILocalNotification *notif in notifications) {
    notif.soundName = [NSString stringWithFormat:@"%@.mp3", soundName]; 
    [[UIApplication sharedApplication] scheduleLocalNotification:notification];
}