自定义slider的效果

UIImage *minImage = [[UIImage p_w_picpathNamed:@"slider-track-fill.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 4, 0, 4)];
    UIImage *maxImage = [UIImage p_w_picpathNamed:@"slider-track.png"];
    UIImage *thumbImage = [UIImage p_w_picpathNamed:@"slider-cap.png"];
       
       
    [[UISlider appearance] setMaximumTrackImage:maxImage forState:UIControlStateNormal];
    [[UISlider appearance] setMinimumTrackImage:minImage forState:UIControlStateNormal];
    [[UISlider appearance] setThumbImage:thumbImage forState:UIControlStateNormal];
    [[UISlider appearance] setThumbImage:thumbImage forState:UIControlStateHighlighted];