WKWebView 加载 Uni-App 导出的本地 H5

Uni-App 打包发布的H5包直接放到APP中加载可以用于提升加载速度，一般有两种方式：

• 直接把包放到 iOS 项目中加载 (多用于开发阶段测试)
• 从后台服务器预下载到文件沙盒内加载 (可以减少APP包大小，同时也能实现热更新功能)

加载步骤

一、创建一个uni-app项目，并打包成H5

• 在官方工具HBuilder中创建一个测试项目

  
  创建uni-app
• 修改 manifest.json 文件中的 h5配置的运行的基础路径为：./
  修改配置

• 发行为H5

  
  H5发行

二、iOS项目内直接加载包内 Uni-App

• 将整个Uni-App包以引用（蓝色文件夹）的方式加入项目

  
  引入Uni-App
• 加载 uni-app

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
    NSString *pathString = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html" inDirectory:@"h5"];
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL fileURLWithPath:pathString]];
    [self.webView loadRequest:request];
}

• 加载uni-app需要携带参数

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
    NSString *pathString = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html" inDirectory:@"h5"];
    NSString *pathString2 = [[NSString stringWithFormat:@"?id=%@",@"testId"] stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLFragmentAllowedCharacterSet]];
    
    NSURL *baseUrl = [NSURL fileURLWithPath:pathString];
    NSURL *loadUrl = [NSURL URLWithString:pathString2 relativeToURL:baseUrl];
    NSURLRequest *request = [NSURLRequest requestWithURL:loadUrl];
    
    [self.webView loadRequest:request];
}

• 加载uni-app指定页面例如 view 示例页面，和上面一样

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    NSString *pathString = [[NSBundle mainBundle] pathForResource:@"index" ofType:@"html" inDirectory:@"h5"];
    NSString *pathString2 = @"#/pages/component/view/view";

    NSURL *baseUrl = [NSURL fileURLWithPath:pathString];
    NSURL *loadUrl = [NSURL URLWithString:pathString2 relativeToURL:baseUrl];
    NSURLRequest *request = [NSURLRequest requestWithURL:loadUrl];

    [self.webView loadRequest:request];
}

三、加载沙盒内Uni-App

基本逻辑和加载本地一致，但是必须使用 relativeToUrl 方法加载，首先确认自己缓存的目录，然后给路径拼接file://协议头:

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *basePath = [[paths objectAtIndex:0] stringByAppendingString:@"h5"];
    
    NSString *path = [basePath stringByAppendingString:@"index.html"];
    
    NSURL *baseUrl = [NSURL fileURLWithPath:basePath];
    
    // 需要手动拼接 file://
    NSString *loadPath = [[NSString stringWithFormat:@"file://%@",path] stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLFragmentAllowedCharacterSet]];
    // 最终加载路径
    NSURL *loadUrl = [NSURL URLWithString:loadPath relativeToURL:baseUrl];
    
    [self.webView loadFileURL:loadUrl allowingReadAccessToURL:[NSURL fileURLWithPath: [paths objectAtIndex:0]]];
}

iOS 加载Uni-APP 效果

Tips: 打包出来的H5先用电脑试下能否成功加载 index.html ~

如果是Origin null is not allowed by Access-Control-Allow-Origin.问题导致无法加载可以按如下设置，使WKWebView允许跨域：

[self.webView.configuration.preferences setValue:@YES forKey:@"allowFileAccessFromFileURLs"];