[置顶] iOS 开发 之 网络编程

时间：2022-12-15 08:12:02

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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

NSURL *url = [NSURL URLWithString:BASE_URL];//1.创建URL对象
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];//2.创建请求对象
[request setHTTPMethod:@"get"];//2.1 创建请求方式(默认是get,这一步可以不写)
NSURLResponse *response = nil;NSError *error = nil;//3.创建响应对象(有时会出错)
NSData *data = [NSURLConnection sendSynchronousRequest:request
returningResponse:&response error:&error];//4.创建连接对象
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingAllowFragments error:nil];//解析
self.dataArray = [NSMutableArray arrayWithCapacity:5];for
(NSDictionary *dict in dic[@"news"]) {//开辟空间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

NSURL *url = [NSURL URLWithString:URL_PORT1];//1.创建url对象
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];//2.创建请求对象
[request setHTTPMethod:@"post"];//2.1(必须写) 创建请求方式
NSData *tempData = [URL_PORT2 dataUsingEncoding:NSUTF8StringEncoding];[request
setHTTPBody:tempData];//3.设置请求参数
NSURLResponse *response = nil;NSError *error = nil;//4.创建响应对象
NSData *data =[NSURLConnection sendSynchronousRequest:request
returningResponse:&response error:&error];//5.创建连接对象
NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data
options:NSJSONReadingAllowFragments error:&error];//6.解析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

NSURL *url = [NSURL URLWithString:BASE_URL];//1. 创建URL对象
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];//2.创建请求对象
[NSOperationQueue mainQueue]主队列,多线程内容.__weak typeof (self)temp
= self;//3.创建连接对象
[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

NSURL *url = [NSURL URLWithString:URL_PORT1];//1.创建url对象
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];//2.创建请求对象
[request setHTTPMethod:@"post"];//2.1(必须写) 创建请求方式
NSData *tempData = [URL_PORT2 dataUsingEncoding:NSUTF8StringEncoding];
[request setHTTPBody:tempData];//3.设置请求参数
__weak typeof (self)ttemp = self;//4.设置创建连接对象[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"

NSURL *url = [NSURL URLWithString:BASE_URL];//1.创建URL对象

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];//2.创建请求对象

NSURLConnection * connection = [NSURLConnection connectionWithRequest:request
delegate:self];//3.创建连接对象,并实现代理

[connection start];//4.开始执行

get异步代理

NSURLConnectionDataDelegate

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse
*)response{ //1.接收到服务器的响应
self.tempData = [NSMutableData data];//准备数据接收}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData
*)data{//2.接收请求的数据
[_tempData appendData:data];//将每次新接收到的数据拼接到原有数据包的后面;}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection{//3.加载完毕,开始解析NSDictionary
*dic = [NSJSONSerialization JSONObjectWithData:_tempData options:NSJSONReadingAllowFragments error:nil];NSLog(@"%@",dic);}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError
*)error{ //打印失败信息 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];
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse
*)response{//1.接收到服务器的响应
self.tempData = [NSMutableData data]; //准备数据接收}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData
*)data{//2.接收请求的数据
[_tempData appendData:data]; //将每次新接收到的数据拼接到原有数据包的后面;}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection{//3.加载完毕,开始解析NSDictionary
*dic = [NSJSONSerialization JSONObjectWithData:_tempData options:NSJSONReadingAllowFragments error:nil];NSLog(@"%@",dic);}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError
*)error{ //打印失败信息NSLog(@"文件链接出现了error:%@",error);}

post异步session

NSURL *url = [NSURL URLWithString:URL_PORT1];//1.创建URL对象
NSMutableURLRequest *request = [[NSMutableURLRequest alloc]
initWithURL:url];2.创建请求对象
[request setHTTPMethod:@"post"];//2.1
NSData *tempData = [URL_PORT2 dataUsingEncoding:NSUTF8StringEncoding];//参数转化
[request setHTTPBody:tempData];
NSURLSession *session = [NSURLSession sharedSession];//3.建立会话
session支持三种类型的任务
NSURLSessionDataTask;//(加载数据)
NSURLSessionDownloadTask;//(下载)
NSURLSessionUploadTask;//(上传)
NSLog(@"%d",[[NSThread currentThread]isMainThread]); __weak
typeof (self)temp = self;//判断是否是子线程 1是子线程,0不是主线程 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]);
dispatch_async(dispatch_get_main_queue(), ^{//回到主线程(刷新数据)
[temp.tableView reloadData]; //相当于tableView的刷新数据 }); }];
[task resume];//4.启动任务}

get异步session

NSURL *url = [NSURL URLWithString:BASE_URL];//1.创建url对象
NSURLSession *session = [NSURLSession sharedSession];//2.创建session对象
NSURLSessionDataTask *task = [session dataTaskWithURL:url
completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {//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);NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:nil];
dispatch_async(dispatch_get_main_queue(), ^{});
[task resume];}

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