使用场景:UIViewController1 打开 UIViewController2(背景半透明弹窗)
案例:打开富文本网页<img>图片的url查看图片详情
WKWebView WKNavigationDelegate代理方法设置js代码点击事件
objectivec
///注册添加图片标签点击js方法
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation{
///js添加图片点击事件
NSString *jsClickImage =@"function registerImageClickAction(){var imgs=document.getElementsByTagName('img');var length=imgs.length;for(var i=0; i < length;i++){img=imgs[i];if(\"ad\" ==img.getAttribute(\"flag\")){var parent = this.parentNode;if(parent.nodeName.toLowerCase() != \"a\")return;}img.onclick=function(){window.location.href='image-preview:'+this.src}}}";
[webView evaluateJavaScript:jsClickImage completionHandler:nil];
[webView evaluateJavaScript:@"registerImageClickAction()" completionHandler:nil];
[webView evaluateJavaScript:@"document.body.scrollHeight" completionHandler:^(id _Nullable result,NSError *_Nullable error) {
//获取webView内容高度
CGFloat height = [result doubleValue];
// [webView mas_updateConstraints:^(MASConstraintMaker *make) {
// make.height.equalTo(@(height));
// }];
webView.frame = CGRectMake(0, 0, self.frame.size.width, height);
[webView layoutIfNeeded];
[webView setNeedsLayout];
if (self.contentHeightCallback != nil) {
self.contentHeightCallback(CGSizeMake(self.frame.size.width, height));
}
}];
}
///拦截点击图片
- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler{
NSString *requestString = navigationAction.request.URL.absoluteString;
NSString *imgKey = @"image-preview";
if([requestString hasPrefix: imgKey]){
NSString *url = [requestString substringFromIndex:imgKey.length+1];
//查看图片详情
[self showPicDetail:url];
decisionHandler(WKNavigationActionPolicyCancel);
return;
}
decisionHandler(WKNavigationActionPolicyAllow);
}
showPicDetail:() 方法打开浮窗:
objectivec
-(void) showPicDetail:(NSString *)imgUrl{
ShowBigPicDetailViewController *vc = [[ShowBigPicDetailViewController alloc] init];
vc.imageUrl = imageUrl;
//设置全屏显示 关键语句,必须有
vc.modalPresentationStyle = UIModalPresentationOverCurrentContext;
[self presentViewController:vc animated:YES completion:nil];
}
设置UIViewController2 背景半透明
objectivec
- (void)viewDidLoad {
[super viewDidLoad];
//设置半透明背景
[self.view setBackgroundColor:[UIColor colorWithRed:0 green:0 blue:0 alpha:0.5f]];
...
}
关闭浮窗弹窗:
objectivec
[self dismissViewControllerAnimated:YES completion:nil];