1 GET请求
1,确定URL
NSURL *url = [NSURL URLWithString:@"xxx"];
2,创建请求对象
NSURLRequest *request = [NSURLRequest requestWithURL:url];
3,获得一个会话对象
NSURLSession *session = [NSURLSession sharedSession];
4.创建请求任务
//第一个参数:请求对象
//第二个参数:completionHandler 完成后执行的回调
//data:响应体
//response:响应头
//error:错误信息
//!!!注意:默认情况下completionHandler在子线程中调用
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:
^(NSData * _Nullable data, NSURLResponse * _Nullable response,
NSError * _Nullable error) {
//解析服务器返回的数据
}];
5,执行任务
[dataTask resume];
2 POST请求
1,确定URL
NSURL *url = [NSURL URLWithString:@"xxx"];
2,创建可变请求对象
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
//修改请求方式为POST
request.HTTPMethod = @"POST";
//设置请求体
request.HTTPBody = [@"username=520it&pwd=520&type=JSON" dataUsingEncoding:NSUTF8StringEncoding];
3,获得一个会话对象
NSURLSession *session = [NSURLSession sharedSession];
4.创建请求任务
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request completionHandler:
^(NSData * _Nullable data, NSURLResponse * _Nullable response,
NSError * _Nullable error) {
//解析服务器返回的数据
}];
5,执行任务
[dataTask resume];
3 代理方法
1,确认请求路径
NSURL *url = [NSURL URLWithString:@"xxx"];
2,创建会话对象
NSURLSession *session = [NSURLSession sessionWithConfiguration:
[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[NSOperationQueue mainQueue]];
3,创建任务Task
NSURLSessionDataTask *dataTask = [session dataTaskWithURL:url];
4,执行Task
[dataTask resume];
5,-----代理-----
//当接收到服务器响应的时候调用
//默认情况下是不会接收服务器返回数据的,如果需要接收应该主动告诉系统
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveResponse:(NSURLResponse *)response
completionHandler:(void (^)(NSURLSessionResponseDisposition))completionHandler
{
NSLog(@"didReceiveResponse");
/*
NSURLSessionResponseCancel = 0, 取消(默认的做法)
NSURLSessionResponseAllow = 1, 允许(接收数据)
NSURLSessionResponseBecomeDownload = 2,
NSURLSessionResponseBecomeStream NS_ENUM_AVAILABLE(10_11, 9_0) = 3,
*/
completionHandler(NSURLSessionResponseAllow);
}
//当接收到服务器返回数据的时候调用(会调用多次)
- (void)URLSession:(NSURLSession *)session dataTask:(NSURLSessionDataTask *)dataTask
didReceiveData:(NSData *)data
{
NSLog(@"didReceiveData");
[self.resultData appendData:data];
}
//当请求完成或者是失败的时候调用
- (void)URLSession:(NSURLSession *)session task:(NSURLSessionTask *)task
didCompleteWithError:(NSError *)error
{
NSLog(@"didCompleteWithError");
//解析数据
NSLog(@"%@",[[NSString alloc]initWithData:self.resultData encoding:NSUTF8StringEncoding]);
}