Question

我需要能够在警报中显示开关是否打开以及其他详细信息，所有细节都显示正常但是当我尝试添加notificationStatus字符串时它会给我一个错误。 “使用未声明的标识符'notificationStatus'”

-(void) procrastinationNotificationSwitchOnOrOff {

    if (_procrastinationNotificationSwitch.on) {
        _notificationOnOffLabel.text = @"Procrastination Notification On";
        NSString *notificationStatus = @"NOTIFICATION ON";
        NSLog(notificationStatus);
    }
    else {
        _notificationOnOffLabel.text = @"Procrastination Notification Off";
        NSString *notificationStatus = @"NOTIFICATION OFF";
        NSLog(notificationStatus);
    }
}


-(void) presentMessage:(NSString *)message {
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Class Stuff" message:message delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];
    [alert show];

}

-(void) notificationStatus:(NSString *)stat {
   NSString *status = [NSString stringWithFormat:@"%@", stat];

}


-(IBAction)returnKeyButton:(id)sender {
    [sender resignFirstResponder];

    NSString *classNameString = self.className.text;
    NSLog(classNameString);
    NSString *assignmentTitleString = self.assignmentTitle.text;
    NSLog(assignmentTitleString);
    NSString *assignmentDescriptionString = self.assignmentDescription.text;
    NSLog(assignmentDescriptionString);
    NSString *totalStrings = [NSString stringWithFormat:@"%@ %@ %@ %@", classNameString, assignmentTitleString, assignmentDescriptionString, notificationStatus];
    NSLog(totalStrings);

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
    dateFormatter.timeZone = [NSTimeZone defaultTimeZone];
    dateFormatter.timeStyle = NSDateFormatterShortStyle;
    dateFormatter.dateStyle = NSDateFormatterShortStyle;

    NSString *dateTimeString = [dateFormatter stringFromDate: dateTimePicker.date];
    NSLog(@"Alarm Set Button Tapped : %@", dateTimeString );
    [self presentMessage:totalStrings];
}


- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [_procrastinationNotificationSwitch addTarget:self action:@selector(procrastinationNotificationSwitchOnOrOff) forControlEvents:UIControlEventValueChanged];
}

Answer 1

您的方法procrastinationNotificationSwitchOnOrOff中有一个局部变量notificationStatus。您还有notificationStatus。您没有属性或实例变量notificationStatus。

添加属性notificationStatus。摆脱方法notificationStatus。始终使用self.notificationStatus读取和写入notificationStatus。问题解决了。

Answer 2

我认为通过使用方法

让你感到困惑

-(void) notificationStatus:(NSString *)stat {
   NSString *status = [NSString stringWithFormat:@"%@", stat];

}

最好将它变成局部变量，如果你想操纵它，可以使用getter和setter。

使用NSString显示在另一个字符串中？

2 个答案: