无法通过标记获取UIButton

Question

我有4个UIButtons，名为morningbutton，下午按钮，晚间按钮，其中有标记号1、2、3、4 ..and --它在viewDidLoad中分配。我在viewDidLoad中调用了viewDidLoad方法，并且正在调用它作为数据报警器，而通知按钮更改方法由UIButtons调用。

selectedButton是一个NSInteger

用户点击4个标记按钮中的1个(调用notificationButtonChanged)

用户更改日期选择器的值(userTimePickerValueChanged被调用)

当我点击一个基于标记的按钮时，notificationButtonChanged会被调用，并且当我在数据报警器中选择一个时间时，..but selectedButton将返回0，该时间应该存储在用户时间选择器更改的方法中。

如果我将selectedButton = afternoonButton.tag ..then放在第二种情况下执行，那么这4种情况应该如何执行。

我哪里出问题了？

    -(IBAction)notificationButtonChanged:(UIButton *)control
    {
    if (control.tag == 1)
    {
        [userTimePicker reloadInputViews];

        [components setHour:6];;
        [components setMinute:00];

        NSDate *date1 = [gregorian dateFromComponents:components];

        [components setHour:10];
        [components setMinute:00];

        NSDate *date2 = [gregorian dateFromComponents:components];

        [userTimePicker setDatePickerMode:UIDatePickerModeTime];

        [userTimePicker setMinimumDate:date1];
        [userTimePicker setMaximumDate:date2];

    }

    if (control.tag == 2)
    {
        [userTimePicker reloadInputViews];


        [components setHour:12];
        [components setMinute:00];

        NSDate *date1 = [gregorian dateFromComponents:components];

        [components setHour:14];
        [components setMinute:00];

        NSDate *date2 = [gregorian dateFromComponents:components];

        [userTimePicker setDatePickerMode:UIDatePickerModeTime];

        [userTimePicker setMinimumDate:date1];
        [userTimePicker setMaximumDate:date2];

    }

    if (control.tag == 3)
    {
        [userTimePicker reloadInputViews];


        [components setHour:15];
        [components setMinute:00];

        NSDate *date1 = [gregorian dateFromComponents:components];

        [components setHour:18];
        [components setMinute:00];

        NSDate *date2 = [gregorian dateFromComponents:components];

        [userTimePicker setDatePickerMode:UIDatePickerModeTime];

        [userTimePicker setMinimumDate:date1];
        [userTimePicker setMaximumDate:date2];


    }

    if (control.tag == 4)
    {
        [userTimePicker reloadInputViews];


        [components setHour:19];
        [components setMinute:00];

        NSDate *date1 = [gregorian dateFromComponents:components];

        [components setHour:22];
        [components setMinute:00];

        NSDate *date2 = [gregorian dateFromComponents:components];

        [userTimePicker setDatePickerMode:UIDatePickerModeTime];

        [userTimePicker setMinimumDate:date1];
        [userTimePicker setMaximumDate:date2];

    }
}

-(void) userTimePickerValueChanged:(UIButton *)sender
{
    selectedButton = [sender tag];

       switch (selectedButton)
    {
case 1:
    {
        NSUserDefaults *userSelectedMorningTime = [NSUserDefaults standardUserDefaults];

        NSDate *selectedMorningTime = [userTimePicker date];

        NSLog (@"SETTING: morningTimeKey");

        [userSelectedMorningTime setObject:selectedMorningTime forKey:@"morningTimeKey"];
        [userSelectedMorningTime synchronize];
    }
    break;
    case 2:
        {

            NSUserDefaults *userSelectedAfternoonTime = [NSUserDefaults standardUserDefaults];

            NSDate *selectedAfternoonTime = [userTimePicker date];

            NSLog (@"SETTING: afternoonTimeKey");

            [userSelectedAfternoonTime setObject:selectedAfternoonTime forKey:@"afternoonTimeKey"];
            [userSelectedAfternoonTime synchronize];


        }break;
        case 3:
        {


            NSUserDefaults *userSelectedEveningTime = [NSUserDefaults standardUserDefaults];

            NSDate *selectedEveningTime =[userTimePicker date];

            NSLog (@"SETTING: eveningTimeKey");

            [userSelectedEveningTime setObject:selectedEveningTime forKey:@"eveningTimeKey"];
            [userSelectedEveningTime synchronize];


        }break;
        case 4:
        {

            NSUserDefaults *userSelectedNightTime = [NSUserDefaults standardUserDefaults];

            NSDate *selectedNightTime =[userTimePicker date];

            NSLog (@"SETTING: nightTimeKey");

            [userSelectedNightTime setObject:selectedNightTime forKey:@"nightTimeKey"];
            [userSelectedNightTime synchronize];

        }
            break;
        default:
            break;
    }

}

viewDidLoad

- (void)viewDidLoad
{
    [super viewDidLoad];

    userTimePicker = [[UIDatePicker alloc]init];
    [userTimePicker addTarget: self
                   action: @selector(userTimePickerValueChanged:)forControlEvents: UIControlEventValueChanged];


    morningButton = [[UIButton alloc]init];
    morningButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    afternoonButton = [[UIButton alloc]init];
    afternoonButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    eveningButton = [[UIButton alloc]init];
    eveningButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

    nightButton =[[UIButton alloc]init];
    nightButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];


 }



    -(IBAction)settingsButtonChanged:(UIButton *)sender
{

    settingsView.frame = CGRectMake(25.0, 60.0, 280.0, 400.0);

    morningButton.tag = 1;
    morningButton.frame = CGRectMake(25.0, 20.0, 80.0, 40.0);
    morningButton.backgroundColor = [UIColor brownColor];
    [morningButton setTitle:@"Morning" forState:UIControlStateNormal];

    afternoonButton.tag =2;
    afternoonButton.frame = CGRectMake(185.0, 20.0, 80.0, 40.0);
    afternoonButton.backgroundColor = [UIColor grayColor];
    [afternoonButton setTitle:@"Afternoon" forState:UIControlStateNormal];

    eveningButton.tag = 3;
    eveningButton.frame = CGRectMake(25.0, 70.0, 80.0, 40.0);
    eveningButton.backgroundColor = [UIColor greenColor];
    [eveningButton setTitle:@"Evening" forState:UIControlStateNormal];


    nightButton.tag = 4;
    nightButton.frame = CGRectMake(185.0, 70.0, 80.0, 40.0);
    nightButton.backgroundColor = [UIColor orangeColor];
    [nightButton setTitle:@"Night" forState:UIControlStateNormal];


    userTimePicker.frame = CGRectMake(60.0, 194.0, 150.0, 180.0);
    userTimePicker.datePickerMode = UIDatePickerModeTime;

    [morningButton addTarget:self action:@selector(notificationButtonChanged:) forControlEvents:UIControlEventTouchUpInside];
    [afternoonButton addTarget:self action:@selector(notificationButtonChanged:) forControlEvents:UIControlEventTouchUpInside];
    [eveningButton addTarget:self action:@selector(notificationButtonChanged:) forControlEvents:UIControlEventTouchUpInside];
    [nightButton addTarget:self action:@selector(notificationButtonChanged:) forControlEvents:UIControlEventTouchUpInside];


    [self.view addSubview:remedyViewBackButton];
    [settingsView addSubview:morningButton];
    [settingsView addSubview:afternoonButton];
    [settingsView addSubview:eveningButton];
    [settingsView addSubview:nightButton];


    [settingsView addSubview:userTimePicker];
    [remedyView addSubview:remedyViewBackButton];
    [remedyView addSubview:settingsView];
}

Answer 1

由于没有为此设置标记，因此默认将其赋值为0。如果您给它分配了标记，那么在代码中的某个地方，您要将标记0重新分配到它，检查它正在重新分配的位置。指定超过1000的标记，然后尝试。意思是给他们分配1000,1001,1002,1003，仅仅是为了检查。

将您的代码更改为

- (void)viewDidLoad
{
    [super viewDidLoad];

    userTimePicker = [[UIDatePicker alloc]init];
    [userTimePicker addTarget: self
                   action: @selector(userTimePickerValueChanged:)forControlEvents: UIControlEventValueChanged];


    morningButton = [[UIButton alloc]init];
    morningButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

morningButton.tag=1;
    afternoonButton = [[UIButton alloc]init];
    afternoonButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
afternoonButton.tag=2;

    eveningButton = [[UIButton alloc]init];
    eveningButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];

 eveningButton.tag=3;

    nightButton =[[UIButton alloc]init];
    nightButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
nightButton.tag=4;


 }

也可以在所有的按钮上使用initWithFrame

Answer 2

当调用-(void)userTimePickerValueChanged:(UIButton *)sender时，发送方是日期选择器，而您将其错误地转换为UIButton*。该标记每次都是相同的值，日期选择器本身的标记可能是0。

不确定在该方法中要执行什么函数，但开关可能基于日期选择器的值，即所选日期。

Answer 3

如果我正确地理解了您正在做的事情，时间选择器将调用userTimePickerValueChanged，因此在

-(void) userTimePickerValueChanged:(UIButton *)sender

发送者将是时间选择者，而不是您的任何按钮。这就解释了为什么它不起作用。

要解决这个问题，您需要在类中定义一个属性，其中存储的按钮实际上触发了要显示的日期选择器。那你就会做：

-(IBAction)notificationButtonChanged:(UIButton *)control
{
if (control.tag == 1)
{
   self.pressedButtonTag = control.tag;
   ...

以及：

-(void) userTimePickerValueChanged:(UIButton *)sender
{
   switch (self.pressedButtonTag)
  {

如果您感到“懒惰”，并且不希望创建一个特定的属性来跟踪按下的按钮，则可以动态地重新分配datePicker.tag。

-(IBAction)notificationButtonChanged:(UIButton *)control {
  if (control.tag == 1) {
    userTimePicker.tag = control.tag;
    ...

以及：

-(void) userTimePickerValueChanged:(UIDatePicker *)sender {
   switch (sender.tag)
  {

请记住，第二个选项更像是一个黑客，所以我让您来决定您喜欢做什么，但是在第二个例子中添加注释来解释事情是如何工作的。