iOS6，7均可使用，iOS7下更改進度條高度即可

//progress

    CGRect rtTemp = CGRectMake(nSpaceX, nSpaceY * 2, popBgView.frame.size.width - 2 * nSpaceX, 20);
    if (isPad)
    {
        rtTemp.size.height = 30;
    }
    UIProgressView* progressView = [[UIProgressView alloc] initWithFrame:rtTemp];
    progressView.backgroundColor = [UIColor clearColor];
    [progressView setProgress:self.fPercent];
    
    //更改進度條高度
    progressView.transform = CGAffineTransformMakeScale(1.0f,3.0f);
    
    UIImage* imgTemp = [UIImage imageNamed:@"progress_off.png"];
    CGFloat width = imgTemp.size.width/2.0;
    CGFloat height = imgTemp.size.height/2.0;
    UIImage *imgTrack = [[UIImage imageNamed:@"progress_off.png"]resizableImageWithCapInsets:UIEdgeInsetsMake(height, width, height, width)];
    UIImage *imgProgress = [[UIImage imageNamed:@"progress_on.png"]resizableImageWithCapInsets:UIEdgeInsetsMake(height, width, height, width)];
    [progressView setProgressImage:imgProgress];
    [progressView setTrackImage:imgTrack];
    [popBgView addSubview:progressView];
    [progressView release];