WKWebView添加加载进度条

WKWebView添加加载进度条

1,先懒加载一个进度条。

#pragma mark - ***** 进度条
- (UIProgressView *)progressView
{
    if (!_progressView)
    {
        UIProgressView *progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 0)];
        progressView.tintColor = [UIColor blueColor];
        progressView.trackTintColor = [UIColor magentaColor];
        [self.view addSubview:progressView];
        self.progressView = progressView;
    }
    return _progressView;
}

2,初始化WKWebView。

WKWebView *wkWebView = [[WKWebView alloc] initWithFrame:self.view.bounds];
        wkWebView.autoresizingMask =       UIViewAutoresizingFlexibleWidth|UIViewAutoresizingFlexibleHeight;
        wkWebView.backgroundColor = [UIColor whiteColor];
        wkWebView.navigationDelegate = self;

        /*! 适应屏幕 */
//        wkWebView.scalesPageToFit = YES;
        /*! 解决iOS9.2以上黑边问题 */
        wkWebView.opaque = NO;
        /*! 关闭多点触控 */
        wkWebView.multipleTouchEnabled = YES;
        /*! 加载网页中的电话号码，单击可以拨打 */
//        wkWebView.dataDetectorTypes = YES;

        [self.view insertSubview:wkWebView belowSubview:_progressView];

        [wkWebView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];
        NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:_urlString]];
        [wkWebView loadRequest:request];
        self.wkWebView = wkWebView;

3，在KVO中设置相关逻辑

#pragma mark 计算wkWebView进度条
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context
{
    if (object == self.wkWebView && [keyPath isEqualToString:@"estimatedProgress"])
    {
        CGFloat newprogress = [[change objectForKey:NSKeyValueChangeNewKey] doubleValue];
        if (newprogress == 1)
        {
            self.progressView.hidden = YES;
            [self.progressView setProgress:0 animated:NO];
        }
        else
        {
            self.progressView.hidden = NO;
            [self.progressView setProgress:newprogress animated:YES];
        }
    }
}