疑难问题收集

---

WKWebview 在重定向时 cookie 丢失

---

1.WKWebview 在重定向时 cookie 丢失:

1.在 WKWebview 的 viewDidLoad 里注册

// WKWebView 拦截request，添加cookie
    [NSURLProtocol wk_registerScheme:@"http"];
    [NSURLProtocol wk_registerScheme:@"https"];

2.重写NSUrlProtocol的一个抽象方法

+ (NSURLRequest *)canonicalRequestForRequest:(NSURLRequest *)request
{
    NSMutableURLRequest *mutableReqeust = [request mutableCopy];

    
    NSMutableDictionary *cookieDic = [NSMutableDictionary dictionary];
    NSMutableString *cookieValue = [NSMutableString stringWithFormat:@""];
    NSHTTPCookieStorage *cookieJar = [NSHTTPCookieStorage sharedHTTPCookieStorage];
    for (NSHTTPCookie *cookie in [cookieJar cookies]) {
        [cookieDic setObject:cookie.value forKey:cookie.name];
    }
    
    // cookie重复，先放到字典进行去重，再进行拼接
    for (NSString *key in cookieDic) {
        NSString *appendString = [NSString stringWithFormat:@"%@=%@;", key, [cookieDic valueForKey:key]];
        [cookieValue appendString:appendString];
    }
    
    [mutableReqeust addValue:cookieValue forHTTPHeaderField:@"Cookie"];
    
    return mutableReqeust;
}

参考:http://www.cnblogs.com/sjxjjx/p/7928363.html

2.duplicate symbol _ID in

解析:项目里有两个类里存在了同样的 ID. 可更改其中一个.

3.控制器视图顶部有20pt 高度的空白

解决:
在 ViewDidLoad 里加上:self.edgesForExtendedLayout=UIRectEdgeNone;