1、WKWebView的简单初始化
代码语言:javascript复制- (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
代码语言:javascript复制@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:
代码语言:javascript复制// 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:
代码语言:javascript复制// 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];
}];
}
}];