iOS如何自定义UISlider

添加下面代码就可以了

3. -(void)addMySlider{   
4.         //左右轨的图片 
5.         UIImage *stetchLeftTrack= [UIImage imageNamed:@"light_off_on.png"]; 
6.         UIImage *stetchRightTrack = [UIImage imageNamed:@"light_off_back.png"]; 
7.         //滑块图片 
8.         UIImage *thumbImage = [UIImage imageNamed:@"light_round.png"]; 
9.         UISlider *sliderA=[[UISlider alloc]initWithFrame:CGRectMake(30, 320, 257, 7)]; 
10.         sliderA.backgroundColor = [UIColor clearColor]; 
11.         sliderA.value=0.5; 
12.         sliderA.minimumValue=0.0; 
13.         sliderA.maximumValue=1.0; 
14.         [sliderA setMinimumTrackImage:stetchLeftTrack forState:UIControlStateNormal]; 
15.         [sliderA setMaximumTrackImage:stetchRightTrack forState:UIControlStateNormal]; 
16.         //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 
17.         [sliderA setThumbImage:thumbImage forState:UIControlStateHighlighted]; 
18.         [sliderA setThumbImage:thumbImage forState:UIControlStateNormal]; 
19.         //滑块拖动时的事件 
20.         [sliderA addTarget:self action:@selector(sliderValueChanged) forControlEvents:UIControlEventValueChanged]; 
21.         //滑动拖动后的事件 
22.         [sliderA addTarget:self action:@selector(sliderDragUp) forControlEvents:UIControlEventTouchUpInside]; 
23.         [self.view addSubview:sliderA];   
24.     } 
25.     -(void)sliderDragUp{         
26.         NSLog(@"sliderDragUp"); 
27.     }     
28.     -(void)sliderValueChanged{        
29.         NSLog(@"sliderValueChanged");     
30.     }