网络请求报错 code = 1002 处理

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错误异常

今天使用URLsection写了个文件下载请求，写完后运行程序报错，如下

Error Domain=NSURLErrorDomain Code=-1002 "unsupported URL" **
*Error Domain=NSURLErrorDomain Code=-1002 "unsupported URL" UserInfo={NSLocalizedDescription=unsupported URL, NSUnderlyingError=0x7fa9b1d06120 {Error Domain=kCFErrorDomainCFNetwork Code=-1002 "(null)"}} *

错误原因

后来百度了一下是URL编码问题，只要报请求url用utf-8转码一下就可以了

处理方法

iOS 8 要用utf8转码：

urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

iOS 8 以后要用这个方法：

urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet characterSetWithCharactersInString:@"#%^{}\"[]|\\<> "].invertedSet];

or

urlString = [urlString stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]];