iOS中点击按钮跳转微信小程序

需求

在iOS的UIWebView界面，点击button，直接打开微信跳转到微信小程序。

实现方式

1. 接入微信SDK,pod中增加下面一句话

pod 'WechatOpenSDK'

2. AppDelegate文件导入<WechatOpenSDK/WXApi.h>并实现代理 <WXApiDelegate>

初始化你的微信WXAPI，增加代理的时候，会报警告，"Implementing deprecated method",由于微信没有更新API，就只能用之前版本废了的方法，所以暂时就忽略警告吧，如果微信改了的话，请及时通知我。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [WXApi registerApp:@"wxf691476627360000"];//ID为你申请的微信开放ID
}

- (BOOL)application:(UIApplication *)application handleOpenURL:(nonnull NSURL *)url
{
    return [WXApi handleOpenURL:url delegate:self];
}

- (BOOL)application:(UIApplication *)app openURL:(NSURL *)url sourceApplication:(nullable NSString *)sourceApplication annotation:(nonnull id)annotation
{
    return [WXApi handleOpenURL:url delegate:self];
}

-(void) onReq:(BaseReq*)req
{
    NSLog(@"req : %@", req);
}

-(void) onResp:(BaseResp*)resp
{
    NSLog(@"req : %@", resp);
}

3. WKWebView代理

- (void)webView:(WKWebView*)webView decidePolicyForNavigationAction:(WKNavigationAction*)navigationAction decisionHandler:(void(^)(WKNavigationActionPolicy))decisionHandler{
    
    WKNavigationActionPolicy policy = WKNavigationActionPolicyAllow;
    // 之前是打开直接跳转APPSOTRE，所以要WKWebView要加上这句话，才能贴砖到APPSTORE商店
    if([[navigationAction.request.URL host] isEqualToString:@"itunes.apple.com"] && [[UIApplication sharedApplication] openURL:navigationAction.request.URL]){
        policy = WKNavigationActionPolicyCancel;
        
    }
    decisionHandler(policy);
}

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message
{
    if ([message.name isEqualToString:@"OpenWxMinFunc"]) {
        [_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:message.body]]];
        [Tools enter_weixin_miniProgramid:@“填写申请的小程序名称” path:@“填写路径”];
    }
}

- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation
{
    [_hud hideAnimated:YES];
}

- (void)webView:(WKWebView *)webView didFailNavigation:(null_unspecified WKNavigation *)navigation withError:(NSError *)error
{
    [_hud hideAnimated:YES];
    [self goBack];
}

- (void)gobackVoid
{
    [self goBack];
}

- (void)goBack
{
    id vc = [self.navigationController popViewControllerAnimated:YES];
    if (nil == vc) {
        [self dismissViewControllerAnimated:YES completion:^{
            // 无事件处理
        }];
    }
}

- (WKWebView *)webView
{
    if (!_webView) {
        WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc]init];
        config.preferences = [[WKPreferences alloc]init];
        config.preferences.minimumFontSize = 10;
        config.preferences.javaScriptEnabled = YES;
        config.preferences.javaScriptCanOpenWindowsAutomatically = NO;
        config.userContentController = [[WKUserContentController alloc] init];
        config.processPool = [[WKProcessPool alloc] init];
        [config.userContentController addScriptMessageHandler:self name:@"OpenWxMinFunc"];
        
        _webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:config];
        _webView.backgroundColor = [UIColor whiteColor];
        _webView.scrollView.bounces = YES;
        NSURL *url = [NSURL URLWithString:@"https://dddd.net/ddd/song_app_list.html"];// 填写你的网址URL
        [_webView loadRequest:[NSURLRequest requestWithURL:url]];
        _webView.navigationDelegate = self;
    }
    return _webView;
}

4. 微信小程序跳转方法：

+ (void)enter_weixin_miniProgramid:(NSString *)userName path:(NSString *)path
{
    if (![WXApi isWXAppInstalled]) {
        [self showMessage:@"您未安装微信，请先安装微信"];
        return;
    }
    WXLaunchMiniProgramReq *launchMini = [WXLaunchMiniProgramReq object];
    launchMini.userName = userName;
    launchMini.path = path;
    launchMini.miniProgramType = WXMiniProgramTypeRelease;
    [WXApi sendReq:launchMini];
}

5. 修改info.plist，增加一条：

<key>LSApplicationQueriesSchemes</key>
<array>
<string>weixin</string>
<string>wechat</string>
</array>

效果如图:

15459766640174.jpg

思考与总结：

1. 这是App拉起小程序，请问如果用小程序拉起APP？是通过onResp回调么？
2. [config.userContentController addScriptMessageHandler:self name:@"OpenWxMinFunc"]，在WKWebView要配置这一条，才能和H5前端联调，请问OpenWxMinFunc这个字段是干嘛用的？