iOS中webview及其JS交互

仿微信小功能之“投诉”(与H5交互)

功能选择列表(粗略写)

1、添加UITableView

@property (weak, nonatomic) IBOutlet UITableView *chatDetailView;

2、添加数据

@property (strong, nonatomic) NSArray *dataArr;

_dataArr = @[@"聊天置顶", @"新消息免打扰", @"聊天室档案", @"设定当前聊天背景", @"查找聊天内容", @"删除聊天记录", @"投诉"];

3、设置代理(没有设置代理运行后只能看到一片灰色)

_chatDetailView.delegate = self;
_chatDetailView.dataSource = self; // 这个也可以通过连线

4、实现代理方法

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 5;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    if(section == 0 || section == 2) {
        return 2;
    }
    return 1;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static int staticRow = 0;
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cellID"];
    if(cell == nil) {
       cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cellID"];
    }
    cell.textLabel.text = _dataArr[staticRow++];
    return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
    return 44.0;
}

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    [tableView deselectRowAtIndexPath:indexPath animated:YES];
    if(indexPath.section == 4) {
        CFComplaintViewController *complaintVC = [[CFComplaintViewController alloc] init];
        [complaintVC loadWebviewWithURL:@"http://www.baidu.com"]; // 这里先用这个url，待更新
        UINavigationController *naviVC = [[UINavigationController alloc] initWithRootViewController:complaintVC];
        [self presentViewController:naviVC animated:YES completion:nil];
    }
}

这里要拉取出网页，还得在info.plist添加：

<key>NSAppTransportSecuritykey>
    <dict>
        <key>NSAllowsArbitraryLoadskey>
        <true/>
    dict>

运行效果：

进入到投诉界面

背景：点击“投诉”，跳转到投诉界面

• 加载网页
  
  • 这里选择用WKWebView

1、导入头文件

#import 

2、添加WKWebview

@property (nonatomic, strong) WKWebView *complaintWebview;

3、添加获取网页的方法

- (void)loadWebviewWithURL:(NSString *)url;

- (void)loadWebviewWithURL:(NSString *)url {
    _complaintWebview = [[WKWebView alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width,self.view.frame.size.height)];
    // 添加进度条(下面会提到)
    [_complaintWebview loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:url]]];
    [self.view addSubview:_complaintWebview];
    // 添加代理方法(下面会提到)
}

• 添加进度条

1、添加进度条

@property (nonatomic, strong) UIProgressView *loadProgressView;
@property (nonatomic, assign) NSInteger loadCount; // 用于确认是否完全加载:0表示未加载或者加载失败，1表示加载完成

// 添加进度条
 _loadProgressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, 64, self.view.frame.size.width, 5)];
 _loadProgressView.trackTintColor = [UIColor blackColor];
 _loadProgressView.progressTintColor = [UIColor greenColor];
 [_complaintWebview addSubview:_loadProgressView];

// 添加观察者
[self.complaintWebview addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];

// 实现监听方法
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {
    WKWebView *webview = (WKWebView *)object;
    if (webview == self.complaintWebview && [keyPath isEqualToString:@"estimatedProgress"]) {
        CGFloat newprogress = [[change objectForKey:NSKeyValueChangeNewKey] doubleValue];
        if (newprogress == 1) {
            self.loadProgressView.hidden = YES;
            [self.loadProgressView setProgress:0 animated:NO];
        }else {
            self.loadProgressView.hidden = NO;
            [self.loadProgressView setProgress:newprogress animated:YES];
        }
    }
}

- (void)setLoadCount:(NSInteger)loadCount {
    _loadCount = loadCount;

    if (loadCount == 0) {
        self.loadProgressView.hidden = YES;
        [self.loadProgressView setProgress:0 animated:NO];
    }else {
        self.loadProgressView.hidden = NO;
        CGFloat oldP = self.loadProgressView.progress;
        CGFloat newP = (1.0 - oldP) / (loadCount + 1) + oldP;
        if (newP > 0.95) {
            newP = 0.95;
        }
        [self.loadProgressView setProgress:newP animated:YES];

    }
}

// 页面开始加载时调用
- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
    self.loadCount ++;
}

// 内容返回时
- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
    self.loadCount --;
}

// 加载失败
- (void)webView:(WKWebView *)webView didFailNavigation: (null_unspecified WKNavigation *)navigation withError:(NSError *)error {
    self.loadCount --;
    NSLog(@"%@",error);
}

// 取消监听
- (void)dealloc { 
    [_complaintWebview removeObserver:self forKeyPath:@"estimatedProgress"];
}

与h5进行交互

背景：当投诉界面是h5写的，如何在用户点击“提交投诉”按钮时返回上个界面

---

WKWebview(该部分待“与h5进行交互”功能添加再更新详细内容)

KVO用法

1、添加观察者
2、在观察者中实现监听方法

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSString *,id> *)change context:(void *)context {}

3、移除观察者

与h5进行交互

出现问题：
Terminating app due to uncaught exception ‘NSInternalInconsistencyException’ reason: ‘Completion handler passed to - [ViewController webView: decidePolicyForNavigationAction: decisionHandler:] was not called’

解决办法: 在webView:decidePolicyForNavigationAction:decisionHandler:函数里需执行decisionHandler的block

decisionHandler(WKNavigationActionPolicyAllow);

待下次更新，如有误，请帮忙指出，谢谢]

demo的github地址：https://github.com/Yangchengfeng/LMN_WKWebViewDemo

H5页面播放器自动播放设置

从上面document的解释可知，需要同时满足mediaPlaybackRequiresUserAction、autoplay设置
OC代码：

    self.mainWebView.allowsInlineMediaPlayback = YES; // 内嵌播放
    self.mainWebView.mediaPlaybackRequiresUserAction = NO; //自动播放

JS代码：

autoplay='autoplay'