iphone - UILocalNotification 未触发

Question

我对 Cocoa Touch 和 Objective-C 非常陌生，但我已经掌握了相当重要的要点，并且正在尝试 UIKit。我有一个链接到按钮的操作，该按钮更改标签并触发 UILocalNotification，这是操作方法:

- (IBAction)changeLabel:(id)sender {
    self.LabelOne.text = @"WHAT UPPP!";
    self.NotifyOne.alertBody = @"Testtttttt";
    self.NotifyOne.alertAction = @"Got It.";
    self.NotifyOne.fireDate = nil;
}

没有错误或警告，但它只是没有触发。我的操作方法有问题吗？

更新
以下是包含 UILocalNotification 的应用程序委托(delegate)初始化:

@interface LearnAppDelegate : NSObject <UIApplicationDelegate> {
    UIButton *_ModifyLabelButton;
    UILabel *_LabelOne;
    UILocalNotification *_NotifyOne;
}

@property (nonatomic, retain) IBOutlet UILocalNotification *NotifyOne;

Answer 1

如果您希望它在没有时间表的情况下显示(例如，当您按下按钮时)，请使用 UIAlertView 或添加 [application presentLocalNotificationNow:self.NotifyOne];到您的代码。

更新

删除 IBOutlet 并使 UILocalNotification 的两个声明具有相同的名称。例如:

@interface LearnAppDelegate : NSObject <UIApplicationDelegate> {
    UIButton *_ModifyLabelButton;
    UILabel *_LabelOne;
    UILocalNotification *NotifyOne;
}

@property (nonatomic, retain) UILocalNotification *NotifyOne;

请记住在您的实现 (.m) 文件中synthesize。

也可以尝试这个:

- (IBAction)changeLabel:(id)sender {
    self.LabelOne.text = @"WHAT UPPP!";
    NotifyOne = [[UILocalNotification alloc] init];
    if (NotifyOne) {
        NotifyOne.alertBody = @"Testtttttt";
        NotifyOne.alertAction = NSLocalizedString(@"Got It.", nil);
        NotifyOne.fireDate = nil;
        NotifyOne.soundName = nil;
        NotifyOne.applicationIconBadgeNumber = 0;
        [application presentLocalNotificationNow:NotifyOne];
        [NotifyOne release];
        NotifyOne = nil;
    }
}