UIImage *thumbImage = [UIImage imageNamed:@"mark.png"];
    
    UISlider *sliderA=[[UISlider alloc]initWithFrame:CGRectMake(30, 320, 257, 7)];
    sliderA.backgroundColor = [UIColor clearColor];
    sliderA.value=1.0;
    sliderA.minimumValue=0.7;
    sliderA.maximumValue=1.0;
    
    [sliderA setMinimumTrackImage:stetchLeftTrack forState:UIControlStateNormal];
    [sliderA setMaximumTrackImage:stetchRightTrack forState:UIControlStateNormal];
    //注意这里要加UIControlStateHightlighted的状态，否则当拖动滑块时滑块将变成原生的
控件
    [sliderA setThumbImage:thumbImage forState:UIControlStateHighlighted];
    [sliderA setThumbImage:thumbImage forState:UIControlStateNormal];
    //滑块拖动时的事件
    [sliderA addTarget:self action:@selector(sliderValueChanged:) 
forControlEvents:UIControlEventValueChanged];
    //滑动拖动后的事件
    [sliderA addTarget:self action:@selector(sliderDragUp:) 
forControlEvents:UIControlEventTouchUpInside];
    
    [self.view addSubview:sliderA]; 
 
为了大家实验方便，我附上背景图

brightness_bar.png和滑块图mark.png

http://pic002.cnblogs.com/images/2011/162291/2011121611431816.png

http://pic002.cnblogs.com/images/2011/162291/2011121611432897.png

 -(IBAction)sliderValueChanged:(id)sender{
UISlider *slider = (UISlider *) sender;
NSString *newText = [[NSString alloc] initWithFormat:@”%d”, (int)(slider.value + 0.5f)];
label.text = newText;
}
 

活动表单

 

<UIActionSheetDelegate>

 - (IBActive) someButtonPressed:(id) sender
{
    UIActionSheet *actionSheet = [[UIActionSheet alloc] 
                    initWithTitle:@”Are you sure?”
                    delegate:self
                    cancelButtonTitle:@”No way!”