iOS - NSURLConnection finished with error - code -1002

网络请求会异常，比如报错：Error domain: @"NSURLErrorDomain" - code: 

在回调的地方打一个断点，然后用命令行查看下什么错误： po error
当错误是：**[Error Domain=NSURLErrorDomain Code=- ] "unsupported URL" **
*Error Domain=NSURLErrorDomain Code=- "unsupported URL" UserInfo={NSLocalizedDescription=unsupported URL, NSUnderlyingError=0x7fa9b1d06120 {Error Domain=kCFErrorDomainCFNetwork Code=- "(null)"}}  *  的时候是url编码问题，处理一下URL编码就好了

我这边是后台返回的拼接的接口多了“/”,导致统一的域名格式不统一

http://gwtest.opg-iot.com:8000//api-sdeventApplication/images/handle/event_result/event_result_beimg_20190522093224_0.jpeg?Authenticator=eyJhbGciOiJIUzI1NiJ9.eyJyZWFsTmFtZSI6bnVsbCwibG9naW5OYW1lIjoiU0Q3MzkzIiwidXNlclR5cGUiOiIxIiwicGxhdGZvcm1JZCI6MTAsImV4cCI6MTU1OTA5MzkxOSwidXNlcklkIjo3MzkzfQ.KieGb8LUsgpvn9BU9jjSiNSNn12irclYKiPH_s0Uqgk

处理方法:

iOS  要用utf8转码：

urlString = [urlString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];

iOS  以后要用这个方法：

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