Uni-App 打包發布的H5包直接放到APP中加載可以用于提升加載速度，一般有兩種方式：

• 直接把包放到 iOS 項目中加載 (多用于開發階段測試)
• 從后臺服務器預下載到文件沙盒內加載 (可以減少APP包大小，同時也能實現熱更新功能)

加載步驟

一、創建一個uni-app項目，并打包成H5

• 在官方工具HBuilder中創建一個測試項目

  
  
  創建uni-app
• 修改 manifest.json 文件中的 h5配置的運行的基礎路徑為：./
  
  修改配置

• 發行為H5

  
  
  H5發行

二、iOS項目內直接加載包內 Uni-App

• 將整個Uni-App包以引用（藍色文件夾）的方式加入項目

  
  
  引入Uni-App
• 加載 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];
}

• 加載uni-app需要攜帶參數

- (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];
}

• 加載uni-app指定頁面例如 view 示例頁面，和上面一樣

- (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、加載沙盒內Uni-App

基本邏輯和加載本地一致，但是必須使用 relativeToUrl 方法加載，首先確認自己緩存的目錄，然后給路徑拼接file://協議頭:

- (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];
    
    // 需要手動拼接 file://
    NSString *loadPath = [[NSString stringWithFormat:@"file://%@",path] stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLFragmentAllowedCharacterSet]];
    // 最終加載路徑
    NSURL *loadUrl = [NSURL URLWithString:loadPath relativeToURL:baseUrl];
    
    [self.webView loadFileURL:loadUrl allowingReadAccessToURL:[NSURL fileURLWithPath: [paths objectAtIndex:0]]];
}

iOS 加載Uni-APP 效果

Tips: 打包出來的H5先用電腦試下能否成功加載 index.html ~

如果是Origin null is not allowed by Access-Control-Allow-Origin.問題導致無法加載可以按如下設置，使WKWebView允許跨域：

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