NJKWebViewProgress地址：https://github.com/ninjinkun/NJKWebViewProgress

导入头文件

#import "NJKWebViewProgressView.h"
#import "NJKWebViewProgress.h"

遵守协议

  <UIWebViewDelegate, NJKWebViewProgressDelegate>

实现代码

@implementation ViewController
{
    IBOutlet __weak UIWebView *_webView;
    NJKWebViewProgressView *_webViewProgressView;
    NJKWebViewProgress *_webViewProgress;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    _webViewProgress = [[NJKWebViewProgress alloc] init];
    _webView.delegate = _webViewProgress;
    _webViewProgress.webViewProxyDelegate = self;
    _webViewProgress.progressDelegate = self;


CGRect navBounds = self.navigationController.navigationBar.bounds;
CGRect barFrame = CGRectMake(0,
                             navBounds.size.height - 2,
                             navBounds.size.width,
                             2);
_webViewProgressView = [[NJKWebViewProgressView alloc] initWithFrame:barFrame];
_webViewProgressView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleTopMargin;
[_webViewProgressView setProgress:0 animated:YES];
[self loadBaidu];
[self.navigationController.navigationBar addSubview:_webViewProgressView];
}

-(void)loadBidu
{
    NSURLRequest *req = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.baidu.com/"]];
    [_webView loadRequest:req];
}

#pragma mark - NJKWebViewProgressDelegate
-(void)webViewProgress:(NJKWebViewProgress *)webViewProgress updateProgress:(float)progress
{
    [_webViewProgressView setProgress:progress animated:YES];
    self.title = [_webView stringByEvaluatingJavaScriptFromString:@"document.title"];
}