本文主要是介绍WKWebView常见功能及如何返回上级界面,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
1、WKWebView的简单初始化
- (WKWebView *)webView{if (_webView == nil) {_webView = [[WKWebView alloc] initWithFrame:self.sContentView.bounds];[_webView setAutoresizingMask:UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight];[_webView setNavigationDelegate:self];[_webView setUIDelegate:self];[_webView setMultipleTouchEnabled:YES];[_webView setAutoresizesSubviews:YES];[_webView.scrollView setAlwaysBounceVertical:YES];// 这行代码可以是侧滑返回webView的上一级,而不是根控制器(*只针对侧滑有效)[_webView setAllowsBackForwardNavigationGestures:true];}return _webView;
}
至于如何加载webView用法和UIWebViewle类似,自行百度,下面介绍r如何返回上一层,代码结合ReactiveCocoa,ReactiveCocoa的简单使用
@weakify(self)// 返回按钮[self.baseView.navView addSubview:self.backBtn];[[self.backBtn rac_signalForControlEvents:UIControlEventTouchUpInside] subscribeNext:^(id x) {@strongify(self)if ([self.webView canGoBack]) {[self.webView goBack];} else {[self.viewModel.services popViewModelAnimated:YES];}}];
如果要做到类似于微信里面的返回上一级出现有好的提示,可以采用ReactiveCocoa非常牛逼的监听机制:
// 绑定关闭按钮RAC(self.baseView.popBtn, hidden) = [RACObserve(self.webView, canGoBack) map:^id(NSNumber *canGoBackNum) {@strongify(self)if (canGoBackNum.boolValue) {[self.backBtn setTitle:@"返回" forState:UIControlStateNormal];} else {[self.backBtn setTitle:@"" forState:UIControlStateNormal];}[self.backBtn sizeToFit];return @(!canGoBackNum.boolValue);}];
现在好多APP都会在导航栏下方添加进度条,提醒用户webView的加载进度,这在WKWebView中实现起来也非常简单,只需自定义UIProgressView即可:
// 监听进度[RACObserve(self.webView, estimatedProgress) subscribeNext:^(id x) {@strongify(self)[self.progressView setAlpha:1.0f];BOOL animated = self.webView.estimatedProgress > self.progressView.progress;[self.progressView setProgress:self.webView.estimatedProgress animated:animated];if(self.webView.estimatedProgress >= 1.0f) {[UIView animateWithDuration:0.3f delay:0.3f options:UIViewAnimationOptionCurveEaseOut animations:^{[self.progressView setAlpha:0.0f];} completion:^(BOOL finished) {[self.progressView setProgress:0.0f animated:NO];}];}}];
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