前言：
在iOS开发中，或多或少的会嵌入一些H5页面，有时候需要原生代码和H5页面进行交互。iOS8开始苹果推出性能更强大的WKWebView,所以一下方法是关于WKWebView与JS的交互。
创建WKWebView:
遵守协议
-(WKWebView *)wkwebview
{
if (!_wkwebview) {
_wkwebview = [[WKWebView alloc] initWithFrame:CGRectMake(0, HeightSignal, ScreenWidth, ScreenHeight-HeightSignal-HeightBottomSafe)];
_wkwebview.scrollView.backgroundColor = [UIColor whiteColor];
_wkwebview.navigationDelegate = self;
_wkwebview.UIDelegate = self;
[self.view addSubview:_wkwebview];
}
return _wkwebview;
}
顶部网页加载进度条:
self.progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, HeightSignal, [[UIScreen mainScreen] bounds].size.width, 2)];
self.progressView.backgroundColor = [UIColor blueColor];
//设置进度条的高度，下面这句代码表示进度条的宽度变为原来的1倍，高度变为原来的1.5倍.
self.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.5f);
[self.view addSubview:self.progressView];
[self.wkwebview addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];//进度监听
#pragma mark 加载进度监听
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
if ([keyPath isEqualToString:@"estimatedProgress"]) {
self.progressView.progress = self.wkwebview.estimatedProgress;
if (self.progressView.progress == 1) {
/*
*添加一个简单的动画，将progressView的Height变为1.4倍，在开始加载网页的代理中会恢复为1.5倍
*动画时长0.25s，延时0.3s后开始动画
*动画结束后将progressView隐藏
*/
__weak typeof (self)weakSelf = self;
[UIView animateWithDuration:0.25f delay:0.3f options:UIViewAnimationOptionCurveEaseOut animations:^{
weakSelf.progressView.transform = CGAffineTransformMakeScale(1.0f, 1.4f);
} completion:^(BOOL finished) {
weakSelf.progressView.hidden = YES;
}];
}
}else{
[super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
}
}
添加JS事件监控：
-(void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.wkwebview.configuration.userContentController addScriptMessageHandler:self name:@"share"];//分享
}
移除JS事件监控：
-(void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
[self.wkwebview.configuration.userContentController removeScriptMessageHandlerForName:@"share"];//分享
}
监听方法：
-(void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
if ([message.name isEqualToString:@"share"]) {
}
}