改变progressBar滑块颜色和进度条颜色

//change the progressBar slider image 

    UIImage *thumbImage = [UIImageimageNamed:@"[e-mail]"];

    [_progressBar setThumbImage:thumbImage forState:UIControlStateHighlighted];

    [_progressBar setThumbImage:thumbImage forState:UIControlStateNormal];

    [_progressBar setMinimumTrackTintColor:[UIColorcolorWithRed:255.0/255.0 green:168.0/255.0blue:0.0/255.0 alpha:1.0]];

    [_progressBar setMaximumTrackTintColor:[UIColorwhiteColor]];