UISlider error : Property 'value' not found on object of type '__strong id'

Question

.h 文件：

@property (strong, nonatomic) IBOutlet UISlider *sliderr;
@property (strong, nonatomic) IBOutlet UILabel *lbl2;

.m 文件：

- (IBAction)slidersact:(id)sender {
    self.lbl2.text = [NSString stringWithFormat:@"%.0f", sender.value];
                                                      [error with ^^]
}

- (void)viewDidLoad {
    [super viewDidLoad];

    self.sliderr.minimumValue = 0.0f;
    self.sliderr.maximumValue = 100.0f;
    self.lbl2.text = @"0";
}

错误：

Property 'value' not found on object of type '__strong id'

Answer 1

id 是任何对象，您需要使用您的控件名称来标识您的对象，例如 - (IBAction)slidersact:(UISlider *)sender 而不是 - (IBAction)slidersact:(id)sender

 - (IBAction)slidersact:(UISlider *)sender {
  self.lbl2.text = [NSString stringWithFormat:@"%.0f", sender.value];
}

UISlider error : Property 'value' not found on object of type '__strong id'

UISlider error : Property 'value' not found on object of type '__strong id'

ios

objective-c

uislider