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- (void)modifyUA

{

id webView = [uiWebViewInstance valueForKeyPath:@"_internal.browserView._webView"];

[webView performSelector:@selector(setCustomUserAgent:) withObject:@"Mozilla/5.0 (Windows; U; Windows NT 5.2) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.2.149.27 Safari/525.13 "];

}

這是示例修改User Agent。獲取WebView使用的是Key-Value Coding的方法

為了更安全地通過apple的審查，可以這樣：

- (void)modifyUA

{

NSString *path = [@"_internal.browser" stringByAppendingString:@"View._webView"];

id webView = [g_webView valueForKeyPath:path];

NSString *selString = [@"setCustom" stringByAppendingString:@"UserAgent:"];

SEL sel = NSSelectorFromString(selString);

[webView performSelector:sel withObject:@"Mozilla/5.0 (Windows; U; Windows NT 5.2) AppleWebKit/525.13 (KHTML, like Gecko) Chrome/0.2.149.27 Safari/525.13 "];

}

把字符串分割再合成就ok

出處：

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