iOS UISlider

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1.eg:通过拖动滑块改变图片透明度

#import "ViewController.h"

@interface ViewController ()

{

    UIImageView *imageView;

}

@end

 @implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    UISlider *slider=[[UISlider alloc]initWithFrame:CGRectMake(20,400,280,10)];

    [self.view addSubview:slider];

    imageView=[[UIImageView alloc]initWithFrame:CGRectMake(50, 50, 215, 300)];

    imageView.backgroundColor=[UIColor grayColor];

    UIImage *image=[UIImage imageNamed:@"2.png"];

    imageView.image=image;

    [self.view addSubview:imageView];

    [slider addTarget:self action:@selector(aa:) forControlEvents:UIControlEventTouchUpInside];

    [slider setThumbImage:[UIImage imageNamed:@"4.png"] forState:UIControlStateNormal];//设置拖动条上滑块的图片

    //创建可拉伸图片进行平铺

    UIImage *minImage=[[UIImage imageNamed:@"6.png"]resizableImageWithCapInsets:UIEdgeInsetsZero resizingMode:UIImageResizingModeTile];

    //设置拖动条已完成部分的轨道图片

    [slider setMinimumTrackImage:minImage forState:UIControlStateNormal];

    UIImage *maxImage=[[UIImage imageNamed:@"7.png"]resizableImageWithCapInsets:UIEdgeInsetsZero resizingMode:UIImageResizingModeTile];

    //设置拖动条未完成部分的轨道图片

    [slider setMaximumTrackImage:maxImage forState:UIControlStateNormal];

    // Do any additional setup after loading the view, typically from a nib.

}

-(IBAction)aa:(UISlider *)sender

{

    [imageView setAlpha:sender.value];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end

与UIProgressView类似，UISlider提供了三个方法：

1）setMinimumTrackImage: forState:;//设置拖动条已完成部分的轨道图片

2）setMaximumTrackImage: forState:;//设置拖动条未完成部分的轨道图片

3)  setThumbImage: forState:;//设置拖动条上滑块的图片

上面三个方法都需要传入UIImage对象，如果再结合“可拉伸”图片，就可以对UISlider进行全方位的定制

iOS UISlider

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原文地址：http://www.cnblogs.com/YuanYe1/p/4620365.html