Question

我正在尝试动态创建UITextField然后点击textField尝试显示选择器视图，但是有些人如何得到上述错误。并且它在循环中运行错误不会停止，除非我停止应用程序。

代码

-(void)textFieldDidBeginEditing:(UITextField *)textField
{


    CGRect textFieldRect =
    [self.view.window convertRect:textField.bounds fromView:textField];
    CGRect viewRect =
    [self.view.window convertRect:self.view.bounds fromView:self.view];
    CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height;
    CGFloat numerator =
    midline - viewRect.origin.y
    - MINIMUM_SCROLL_FRACTION * viewRect.size.height;
    CGFloat denominator =
    (MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION)
    * viewRect.size.height;
    CGFloat heightFraction = numerator / denominator;

    if (heightFraction < 0.0)
    {
        heightFraction = 0.0;
    }
    else if (heightFraction > 1.0)
    {
        heightFraction = 1.0;
    }

    UIInterfaceOrientation orientation =
    [[UIApplication sharedApplication] statusBarOrientation];
    if (orientation == UIInterfaceOrientationPortrait ||
        orientation == UIInterfaceOrientationPortraitUpsideDown)
    {
        animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction);
    }
    else
    {
        animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction);
    }

    CGRect viewFrame = self.view.frame;
    viewFrame.origin.y -= animatedDistance;

    [UIView beginAnimations:nil context:NULL];
    [UIView setAnimationBeginsFromCurrentState:YES];
    [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION];

    [self.view setFrame:viewFrame];

    [UIView commitAnimations];


    if (textField.tag < 10) {


        if ([[datatypeArray objectAtIndex:textField.tag] isEqualToString:@"Currency"])
        {



            [self showpicker:textField];



        }
        else if([[datatypeArray objectAtIndex:textField.tag ] isEqualToString:@"Date" ])
        {



            [self showpicker:textField];


        }
        else if([[datatypeArray objectAtIndex:textField.tag] isEqualToString:@"Text"])
        {



        }

    }
    else
    {


        [self showpicker:textField];


    }





}

-(void)showpicker:(UITextField *)textfield
{
      [textfield resignFirstResponder];

        if (textfield.tag >= 10 ) {

            currentTextField=textfield;
            pickerArray=arraycurrency;

            actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];

            [actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];
            CGRect pickerFrame = CGRectMake(0, 40, 0, 0);

            pickerView = [[UIPickerView alloc] initWithFrame:pickerFrame];
            pickerView.showsSelectionIndicator = YES;
            pickerView.dataSource = self;
            pickerView.delegate = self;
            [actionSheet addSubview:pickerView];

            UIToolbar *pickerToolbar;

            pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
            pickerToolbar.barStyle = UIBarStyleBlackOpaque;
            [pickerToolbar sizeToFit];

            NSMutableArray *barItems = [[NSMutableArray alloc] init];

            UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
            [barItems addObject:flexSpace];

            UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneButtonPressed:)];
            [barItems addObject:doneBtn];

            UIBarButtonItem *cancelBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancelButtonPressed:)];
            [barItems addObject:cancelBtn];

            [pickerToolbar setItems:barItems animated:YES];

            [actionSheet addSubview:pickerToolbar];

            [actionSheet addSubview:pickerView];

            [actionSheet showInView:self.view];
            [actionSheet showInView:[UIApplication sharedApplication].keyWindow];

            [actionSheet setBounds:CGRectMake(0, 0, 320, 485)];




        }
        else if ([[datatypeArray objectAtIndex:textfield.tag ] isEqualToString:@"Date" ])
        {

            [textfield resignFirstResponder];

            currentTextField=textfield;

            actionSheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles:nil];


            pickerDateView = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 44, 0, 0)];
            pickerDateView.datePickerMode = UIDatePickerModeDate;
            pickerDateView.hidden = NO;
            pickerDateView.date = [NSDate date];
            pickerDateView.userInteractionEnabled=YES;
            pickerDateView.timeZone=[NSTimeZone localTimeZone];


            UIToolbar *pickerToolbar;

            pickerToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
            pickerToolbar.barStyle = UIBarStyleBlackOpaque;
            [pickerToolbar sizeToFit];

            NSMutableArray *barItems = [[NSMutableArray alloc] init];

            UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:self action:nil];
            [barItems addObject:flexSpace];

            UIBarButtonItem *doneBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(doneButtonPressed:)];
            [barItems addObject:doneBtn];

            UIBarButtonItem *cancelBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:@selector(cancelButtonPressed:)];
            [barItems addObject:cancelBtn];

            [pickerToolbar setItems:barItems animated:YES];

            [actionSheet addSubview:pickerToolbar];
            [actionSheet addSubview:pickerDateView];

            [actionSheet showInView:[UIApplication sharedApplication].keyWindow];


            [actionSheet setBounds:CGRectMake(0,0,320, 464)];



        }
        else if ( [[datatypeArray objectAtIndex:textfield.tag] isEqualToString:@"Text"])
        {

            [textfield becomeFirstResponder];

        }
        else if((textfield.tag==0 || textfield.tag==1 || textfield.tag==2 || textfield.tag==3 || textfield.tag==4) &&
            [[datatypeArray objectAtIndex:textfield.tag] isEqualToString:@"Currency"]);
        {

            [textfield becomeFirstResponder];

        }

}

Answer 1

在点击UIPickerView

时，下面介绍了显示UItextField的简单代码

-(void)textFieldDidBeginEditing:(UITextField *)sender
    {
      [self willDisplayPickerView];
    }

//代码willDisplayPickerView方法：

    - (void)willDisplayPickerView
      {

        // Init the picker view.
 pickerView = [[UIPickerView alloc] init];

 // Set the delegate and datasource. Don't expect picker view to work
 // correctly if you don't set it.
 [pickerView setDataSource: self];
 [pickerView setDelegate: self];

 // Set the picker's frame. We set the y coordinate to 50px.
 [pickerView setFrame: CGRectMake(xPoint, 50.0f, pickerWidth, 200.0f)];

 // Before we add the picker view to our view, let's do a couple more
 // things. First, let the selection indicator (that line inside the
 // picker view that highlights your selection) to be shown.
 pickerView.showsSelectionIndicator = YES;

 // Allow us to pre-select the third option in the pickerView.
 [pickerView selectRow:2 inComponent:0 animated:YES];

 // OK, we are ready. Add the picker in our view.
 [self.view addSubview: pickerView];
    }

UIApplication beginIgnoringInteractionEvents]溢出。忽略

1 个答案: