IOS 开发 之 网络编程

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注意

1.发送请求

url : = 网络协议(http://今后可能是https) + 文件路径? + 参数1 & 参数2 …

2.接收响应

3.创建连接对象传输数据

xcode7 之后若想要使用http,需要修改info.plist文件

NSAppTransportSecucurity NSDictionary

NSAllowsArbitraryLoads BOOL YES;

第一种get 同步

1.创建URL对象

NSURL *url = [NSURL URLWithString:BASE_URL];

2.创建请求对象

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

2.1 创建请求方式(默认是get,这一步可以不写)

[request setHTTPMethod:@"get"];

3.创建响应对象(有时会出错)

NSURLResponse *response = nil; 

NSError *error = nil;

4.创建连接对象

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

解析

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];

开辟空间

self.dataArray = [NSMutableArray arrayWithCapacity:5]; 

for (NSDictionary *dict in dic[@"news"]) { 

News *news = [News new]; 

[news setValuesForKeysWithDictionary:dict]; 

 [_dataArray addObject:news]; 

} 

for (News *news in _dataArray) { 

  NSLog(@"%@",news); 

}

第二种 post 同步

注:浏览器只能模拟get

1.创建url对象

NSURL *url = [NSURL URLWithString:URL_PORT1];

2.创建请求对象

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

2.1(必须写) 创建请求方式

[request setHTTPMethod:@"post"];

3.设置请求参数

NSData *tempData = [URL_PORT2 dataUsingEncoding:NSUTF8StringEncoding]; 

[request setHTTPBody:tempData];

4.创建响应对象

NSURLResponse *response = nil; 

NSError *error = nil;

5.创建连接对象

NSData *data  =[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];

6.解析

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error]; 

NSLog(@"%@",dic); 

self.dataArray = [NSMutableArray arrayWithCapacity:5];  

    for (NSDictionary *dicq in dic[@"news"]) { 

        News *news = [News new]; 

        [news setValuesForKeysWithDictionary:dicq]; 

        [_dataArray addObject:news]; 

    } 

    for (News *ee in _dataArray) { 

        NSLog(@"%@",ee); 

    }

第三种 GET异步 – BLOCK

创建URL对象

NSURL *url = [NSURL URLWithString:BASE_URL];

2.创建请求对象

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

3.创建连接对象

[NSOperationQueue mainQueue]主队列,多线程内容. 

__weak typeof (self)temp = self;

[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue]completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) {

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]; 

NSLog(@"get异步---%d---",[[NSThread currentThread]isMainThread]);  

temp.dataArray = [NSMutableArray arrayWithCapacity:5]; 

}]; 

NSLog(@"get异步---%d---",[[NSThread currentThread]isMainThread]); 

}

第四种 POST异步 – BLOCK

1.创建url对象

NSURL *url = [NSURL URLWithString:URL_PORT1];

2.创建请求对象

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

2.1(必须写) 创建请求方式

[request setHTTPMethod:@"post"];

3.设置请求参数

NSData *tempData = [URL_PORT2 dataUsingEncoding:NSUTF8StringEncoding]; 

 [request setHTTPBody:tempData];

4.设置创建连接对象

__weak typeof (self)ttemp = self; 

[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse * _Nullable response, NSData * _Nullable data, NSError * _Nullable connectionError) { 

if (nil != data) { 

 NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]; 

        NSLog(@"%@",dic); 

    } 

 ttemp.dataArray = [NSMutableArray arrayWithCapacity:5]; 

    }];

第五种 get异步 – 代理”

1.创建URL对象

NSURL *url = [NSURL URLWithString:BASE_URL];

2.创建请求对象

NSMutableURLRequest  *request = [NSMutableURLRequest requestWithURL:url];

3.创建连接对象,并实现代理

NSURLConnection * connection = [NSURLConnection connectionWithRequest:request delegate:self];

4.开始执行

[connection start];

get异步代理

NSURLConnectionDataDelegate

1.接收到服务器的响应

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{

准备数据接收

self.tempData = [NSMutableData data]; 

}

2.接收请求的数据

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{

将每次新接收到的数据拼接到原有数据包的后面;

[_tempData appendData:data]; 

}

3.加载完毕,开始解析

- (void)connectionDidFinishLoading:(NSURLConnection *)connection{ 

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:_tempData options:NSJSONReadingAllowFragments error:nil]; 

NSLog(@"%@",dic); 

}

打印失败信息

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ 

    NSLog(@"文件链接出现了error:%@",error); 

}

第六种 post异步 – 代理

NSURL *url = [NSURL URLWithString:URL_PORT1]; 

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url]; 

[request setHTTPMethod:@"post"]; 

NSData *tempData = [URL_PORT2 dataUsingEncoding:NSUTF8StringEncoding]; 

[request setHTTPBody:tempData]; 

NSURLConnection *connertion = [NSURLConnection connectionWithRequest:request delegate:self]; 

[connertion start];

1.接收到服务器的响应

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{

准备数据接收

self.tempData = [NSMutableData data];  

}

2.接收请求的数据

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{

将每次新接收到的数据拼接到原有数据包的后面;

[_tempData appendData:data];  

}

3.加载完毕,开始解析

- (void)connectionDidFinishLoading:(NSURLConnection *)connection{ 

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:_tempData options:NSJSONReadingAllowFragments error:nil]; 

NSLog(@"%@",dic); 

}

打印失败信息

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ 

NSLog(@"文件链接出现了error:%@",error); 

}

post异步session

1.创建URL对象

NSURL *url = [NSURL URLWithString:URL_PORT1];

2.创建请求对象

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];

2.1

[request setHTTPMethod:@"post"];

参数转化

NSData *tempData = [URL_PORT2 dataUsingEncoding:NSUTF8StringEncoding];

[request setHTTPBody:tempData];

3.建立会话

NSURLSession *session = [NSURLSession sharedSession];

session支持三种类型的任务

NSURLSessionDataTask;//(加载数据)

NSURLSessionDownloadTask;//(下载)

NSURLSessionUploadTask;//(上传)

//判断是否是子线程 1是子线程,0不是主线程

NSLog(@"%d",[[NSThread currentThread]isMainThread]);  

    __weak typeof (self)temp = self; 

    NSURLSessionDataTask *task = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil]; //解析 

        NSLog(@"%@",dic); 

       NSLog(@"---%d---",[[NSThread currentThread]isMainThread]);

回到主线程(刷新数据)

dispatch_async(dispatch_get_main_queue(), ^{

相当于tableView的刷新数据

[temp.tableView reloadData];  

        }); 

    }];

4.启动任务

[task resume]; 

}

get异步session

1.创建url对象

NSURL *url = [NSURL URLWithString:BASE_URL];

2.创建session对象

NSURLSession *session = [NSURLSession sharedSession];

3.创建task (该方法内部做了处理,默认使用get,直接传递Url即可);

NSURLSessionDataTask *task = [session dataTaskWithURL:url completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) { 

NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];

dispatch_async(dispatch_get_main_queue(), ^{ 

});

[task resume]; 

}

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