利用AFN请求网路数据时出错。（Assertion failure in -[AFHTTPRequestSerializer requestWithMethod:URLString:paramete）

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AFNetworking请求中含有中文时程序崩溃

AFHTTPRequestOperationManager * manager = AFHTTPRequestOperationManager manager;manager GET:urlString parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {//} failure:^(AFHTTPRequestOperation *operation, NSError *error) {//};

出现error：

Assertion failure in -AFHTTPRequestSerializer requestWithMethod:URLString:parameters:error:

需要处理urlString的编码

urlString = urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding;

注意：查看请求的接口是否正确。