封装的POST请求Success Block要这么写
typedefvoid(^_NullableSuccesss)(NSURLSessionDataTask*task,idresponseObject); // 成功Block
在tsak里面取参数
if ([task.response isKindOfClass:[NSHTTPURLResponse class]]) {
NSHTTPURLResponse *r = (NSHTTPURLResponse *)task.response;
NSLog(@"%@",[rallHeaderFields]);
NSDictionary*dict=[rallHeaderFields];
valid_id=dict[@"valid_id"];(你想要的参数)
}
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