UI第七节——UISlider详解

- (void)viewDidLoad {
    [super viewDidLoad];

    // 实例化UISlider，高度对外观没有影响
    UISlider *slider = [[UISlider alloc] initWithFrame:CGRectMake(40, 100, 295, 30)];

    // 设置Slider的最大值和最小值
    slider.maximumValue = 1000;
    slider.minimumValue = 900;

    // 设置Slider的值，thumb会跳到对应的位置
    slider.value = 999;

#if 0
    // 设置颜色
    slider.thumbTintColor = [UIColor redColor];
    slider.maximumTrackTintColor = [UIColor greenColor];
    slider.minimumTrackTintColor = [UIColor purpleColor];
#endif

    // 最大值和最小值的图标
    [slider setMaximumValueImage:[UIImage imageNamed:@"sound_max"]];
    [slider setMinimumValueImage:[UIImage imageNamed:@"sound_min"]];

    // Thumb图标
    [slider setThumbImage:[UIImage imageNamed:@"slider_thumb"] forState:UIControlStateNormal];

    // 滑条的图片，图片一定要设置拉伸区域
    [slider setMaximumTrackImage:[[UIImage imageNamed:@"slider_track_max"] resizableImageWithCapInsets:UIEdgeInsetsMake(5, 5, 4, 4)] forState:UIControlStateNormal];
    [slider setMinimumTrackImage:[[UIImage imageNamed:@"slider_track_min"] resizableImageWithCapInsets:UIEdgeInsetsMake(5, 5, 4, 4)] forState:UIControlStateNormal];

    // 添加Slider滑动事件
    [slider addTarget:self action:@selector(sliderValueChanged:) forControlEvents:UIControlEventValueChanged];

    // 把Slider添加到self.view上
    [self.view addSubview:slider];
}

- (void)sliderValueChanged:(UISlider *)slider
{
    // Slider当前位置的值
    NSLog(@"%f", slider.value);
}