Web 视图不保存 HTML5 本地存储设置 [英] Web View Not Saving HTML5 Local Storage Settings

问题描述

我有一个在 Safari 中运行良好的网络应用程序(它使用本地存储并保存设置并恢复它们).

I have a web app that works fine in Safari (it uses local storage and saves the settings and restores them).

我在 Xcode 4.5.2 中创建了一个 Web 视图，用于加载我的 Web 应用程序.我知道默认情况下 web 视图不支持本地存储，所以我添加了代码来启用它，但现在该应用程序根本无法运行.

I created a web view in Xcode 4.5.2 that loads my web app. I know by default web view doesn't support local storage so I added code to enable it but now the app doesn't work at all.

我在 AppDelegate.m 中的代码:

My code in AppDelegate.m:

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {

    WebPreferences *prefs = [WebView preferences];.
    [prefs _setLocalStorageDatabasePath:@"~/Library/TestApp/LocalStorage"];


    NSString *path = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"html"];
    NSURL* fileURL = [NSURL fileURLWithPath:path];
    NSURLRequest* request = [NSURLRequest requestWithURL:fileURL];
    [self.webView.mainFrame loadRequest:request];
}

@end

这部分是我为了启用本地存储而添加的:

This part is what I added to enable local storage:

    WebPreferences *prefs = [WebView preferences];.
    [prefs _setLocalStorageDatabasePath:@"~/Library/TestApp/LocalStorage"];

我收到以下错误:预期的表达式"-选择器‘首选项’没有已知的类方法"

I get the following error: "Expected expression" - "No known class method for selector 'preferences'"

推荐答案

-preferences 是 WebView 上的实例方法，而不是类方法.您需要执行 WebPreferences *prefs = [self.webView preference] 来检索您的 WebView 的首选项.除了调用-[WebPreferences _setLocalStorageDatabasePath:]，我相信你还会想调用-[WebPreferences setLocalStorageEnabled:]来确保本地存储被启用.

-preferences is an instance method on WebView, not a class method. You'll want to do WebPreferences *prefs = [self.webView preferences] to retrieve the preferences for your WebView. In addition to calling -[WebPreferences _setLocalStorageDatabasePath:], I believe that you'll also want to call -[WebPreferences setLocalStorageEnabled:] to ensure that local storage is enabled.

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