自定义uislider 样式

UIImage *stetchLeftTrack= [[UIImage imageNamed:@"UI27.png"] stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0]; 
    UIImage *stetchRightTrack = [[UIImage imageNamed:@"UI28.png"] stretchableImageWithLeftCapWidth:10.0 topCapHeight:0.0];
    
    
    sliderA=[[UISlider alloc]initWithFrame:CGRectMake(110, 60, 208, 23)];
    sliderA.backgroundColor = [UIColor clearColor]; 
    sliderA.value=lightExtend;
    sliderA.minimumValue=0.0;
    sliderA.maximumValue=0.9;
    
    [sliderA setMinimumTrackImage:stetchLeftTrack forState:UIControlStateNormal];
    [sliderA setMaximumTrackImage:stetchRightTrack forState:UIControlStateNormal];
    [view addSubview:sliderA];