Question

When I try to run it though, I get an error which says “Semantic issue: Property ‘text’ not found on object of type ‘UISlider'”

What’s wrong here?

Here is the code from the header file:

    #import <UIKit/UIKit.h>

@interface BIDViewController : UIViewController

@property (strong, nonatomic) IBOutlet UITextField *nameField;
@property (strong, nonatomic) IBOutlet UITextField *numberField;
@property (strong, nonatomic) IBOutlet UISlider *sliderLabel;

- (IBAction)textFieldDoneEditing:(id)sender;
- (IBAction)backgroundTap:(id)sender;
- (IBAction)sliderChanged:(id)sender;



@end

Implementation file:

    #import "BIDViewController.h"

@implementation BIDViewController
@synthesize sliderLabel;
@synthesize nameField;
@synthesize numberField;

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)viewDidUnload
{
    [self setNameField:nil];
    [self setNumberField:nil];
    [self setSliderLabel:nil];
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

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

- (IBAction)backgroundTap:(id)sender
 {
    [nameField resignFirstResponder];
    [numberField resignFirstResponder];
 }

- (IBAction)sliderChanged:(id)sender
{
    UISlider *slider = (UISlider *)sender;
    int progressAsInt = (int)roundf(slider.value);
    sliderLabel.text = [NSString stringWithFormat:@"%d",progressAsInt];
}

@end

Answer 1

I suspect your sliderLabel has been declared as an object of class UISlider, when it should be UILabel. Can you verify the sliderLabel’s @property declaration in your header file?