WKWebView进度及title

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WKWebView进度及title

WKWebView 的estimatedProgress和title 都是KVO模式，所以可以添加监控：

    [webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:NULL];    [webView addObserver:self forKeyPath:@"title" options:NSKeyValueObservingOptionNew context:NULL];

监控的实现方法：

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {    if ([keyPath isEqualToString:@"estimatedProgress"]) {        if (object == webView) {            [self.progressView setAlpha:1.0f];            [self.progressView setProgress:self.currentSubView.webView.estimatedProgress animated:YES];            if(self.currentSubView.webView.estimatedProgress >= 1.0f) {                [UIView animateWithDuration:0.3 delay:0.3 options:UIViewAnimationOptionCurveEaseOut animations:^{                    [self.progressView setAlpha:0.0f];                } completion:^(BOOL finished) {                    [self.progressView setProgress:0.0f animated:NO];                }];            }        }        else        {            [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];        }    }    else if ([keyPath isEqualToString:@"title"])    {        if (object == self.webView) {            self.title = self.webView.title;        }        else        {            [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];        }    }    else {        [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];    }}

这里的进度增加了动画，类似safari的进度效果

需要注意的是销毁的时候一定要移除监控

        [webView removeObserver:self forKeyPath:@"estimatedProgress"];        [webView removeObserver:self forKeyPath:@"title"];

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