UISlider

Objective-C

在 ViewController.h 或 ViewController.m 的界面中声明一个滑块属性

@property (strong, nonatomic)UISlider *slider;

//Define frame of slider and add to view
CGRect frame = CGRectMake(0.0, 100.0, 320.0, 10.0);
UISlider *slider = [[UISlider alloc] initWithFrame:frame];
[slider addTarget:self action:@selector(sliderAction:) forControlEvents:UIControlEventValueChanged];
[self.slider setBackgroundColor:[UIColor clearColor]];
self.slider.minimumValue = 0.0;
self.slider.maximumValue = 50.0;
//sending a NO/False would update the value of slider only when the user is no longer touching the screen. Hence sending only the final value
self.slider.continuous = YES;
self.slider.value = 25.0;
[self.view addSubview slider];

处理滑块更改事件

- (IBAction)sliderAction:(id)sender {
    NSLog(@"Slider Value %f", sender.value);
}