我一直在尝试在我的应用程序中使用 UIActionSheet。这个想法是,如果您以某种状态退出应用程序,它会在启动时弹出并询问您是否要继续或重置。这是代码:
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
continueYesNo = [prefs boolForKey:@"keyContinueMeeting"];
if (continueYesNo) {
NSString *message_continue = [[NSString alloc] initWithFormat:@"Do you want to Continue the Prior Meeting"];
UIActionSheet *actionSheet = [[UIActionSheet alloc]
initWithTitle:message_continue
delegate:self
cancelButtonTitle:@"Reset"
destructiveButtonTitle:@"Continue"
otherButtonTitles:nil];
[actionSheet showInView:self.view];
[actionSheet release];
[message_continue release];
}
这是在 viewDidLoad 中。实际的代码操作是:
- (void)actionSheet:(UIActionSheet *)actionSheet didDismissWithButtonIndex:(NSInteger)buttonIndex
{
Wasted_TimeAppDelegate *delegate = [[UIApplication sharedApplication] delegate];
NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
if (buttonIndex != [actionSheet cancelButtonIndex]) {
delegate.continueMeeting = YES;
[prefs setBool:YES forKey:@"keyContinueMeeting"];
[ [NSUserDefaults standardUserDefaults] synchronize];
} else {
delegate.continueMeeting = NO;
[prefs setBool:NO forKey:@"keyContinueMeeting"];
[ [NSUserDefaults standardUserDefaults] synchronize];
}
}
这一切看起来都很简单,但由于某种原因,它在 iPhone 上运行没有问题,但在 iPad 上,程序此时崩溃。