Question

I’m trying to create a UISlider in code, it’s fairly simple what I’m doing:

self.slider = [[UISlider alloc] initWithFrame:CGRectMake(66.0, 15.0, 235.0, 23.0)];
self.slider.minimumValue = 0.0;
self.slider.maximumValue = 100.0;
self.slider.continuous = YES;

self.slider addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged];

[self.view addSubview:self.slider];

That code goes in my viewDidLoad method and that’s pretty much all I need, but the slider will not appear when my view is shown. Tried calling setNeedsDisplay on the view as well and it didn’t work.

Answer 1

If you’re creating your slider in code, then you shouldn’t have an IBOutlet to it, and the declaration should be strong (it’s probably being deallocated, since you only have a weak reference).

@property (strong, nonatomic)  UISlider *slider;