UISlider 设置增量

UISlider *slier = [[UISlider alloc]initWithFrame:CGRectMake(wu500.right, 0, 210, 50)];    slier.minimumValue = 500;    slier.maximumValue = 4000;    slier.thumbTintColor = [UIColor redColor];    [self.view addSubview:slier];    [slier addTarget:self action:@selector(sliderValueChanges:) forControlEvents:UIControlEventValueChanged];

- (void)sliderValueChanges:(UISlider *)slider{    [slider setValue:((int)((slider.value + 250) / 500) * 500) animated:YES];    NSLog(@"line(%d): %@,%f",__LINE__,@"slider value ->",slider.value);}