异步连接

/创建一个字符串对象保存接口地址 NSString *str =

@"http://project.lanou3g.com/teacher/yihuiyun/lanou project/activitylist.php";

//创建一个NSURL对象,保存,请求的信息
NSURL *url = [NSURL URLWithString:str];

//创建一个请求对象,携带NSURL对象,进行请求

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

//异步连接,实现请求过程,可以从服务器端获取到 response.data.error

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

//将获取到的data对象,转换成我们想要的容器对象,取决于我们的数据格式,到底是字典ahishi数组

NSDictionary *dataDic = [NSJSONSerialization JSONObjectWithData:data

options:NSJSONReadingMutableContainers | NSJSONReadingMutableLeaves error:nil];

//获取到我们借口中,存储具体信息的数据数组

NSArray *dataArray = [dataDic objectForKey:@"events"];

NSLog(@"数据数组%@",dataArray);

//forin遍历,将接口数据数组中的每个字典得到,KVC转换成模型,再将模型放在我们表示图需要的数据源数组中去,进行使用

NSMutableArray *inforArray = [NSMutableArray arrayWithCapacity:[dataArray count]];

for (NSDictionary *dic in dataArray) { Event *event = [[Event alloc] init];

[event setValuesForKeysWithDictionary:dic];

[inforArray addObject:event];

NSLog(@"address%@",event.address); }

//重新加载数据
[self.tableView reloadData];

}]; }

#import "RootViewController.h" #import "Event.h"
@interface RootViewController ()

@property (nonatomic, retain) NSMutableData *mData; @property (nonatomic)long long totalLength; @property (nonatomic, retain) AVAudioPlayer *player; @property (nonatomic, retain) Event *event;

@end
@implementation RootViewController

//代理请求数据 //可以接收到请求返回的response

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

_totalLength = response.expectedContentLength; //回应的时候就开始初始化,初始化我们的_mData;

_mData = [NSMutableData data];

    NSLog(@"%@",response);
}

//可以接收请求返回的data对象 -(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{

//将data拼接打牌_mData里
[_mData appendData:data]; NSLog(@"---------%.2f%%",100.0 * [_mData length]

/ _totalLength);
}
//请求完成之后执行的方法 -(void)connectionDidFinishLoading:(NSURLConnection *)connection

{
NSLog(@"请求完成");
_player = [[AVAudioPlayer alloc]

initWithData:_mData error:nil]; [_player play];

}

//如果请求失败,可以接受到错误信息 -(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{

    NSLog(@"%@",error);
}

- (void)asynGET
{
#pragma mark ----------------异步连接 GET-------------------

//字符串对象,get请求的最大特点就是参数直接跟在URL后面, 中间以?分隔

NSString *str = @"http://lx.cdn.baidupcs.com/file/5d6bd385c2bbcebbd af8dbd2a1fbb475?bkt=p2-qd-379&xcode=77f7e61f11aa5fe b9cc29fbcaf636d95b618b2c52e59dfa4ed03e924080ece4b&f id=2756918354-250528-139183155092638&time=143885195 7&sign=FDTAXERLBH-DCb740ccc5511e5e8fedcff06b081203- vaupF7kySxfl2WEPsiB9PA1IIxA%3D&to=hc&fm=Nan,B,T,t&s ta_dx=4&sta_cs=814&sta_ft=mp3&sta_ct=5&fm2=Nanjing, B,T,t&newver=1&newfm=1&secfm=1&flow_ver=3&sl=773980 95&expires=8h&rt=sh&r=599721095&mlogid=1550793129&v

uk=-&vbdid=1570913133&fin=%E6%83%85%E8%AF%9D.mp3&fn =%E6%83%85%E8%AF%9D.mp3&slt=pm&uta=0&rtype=1&iv=0&i sw=0";

//讲一个字符串对象转化成一个NSURL对象
NSURL *url = [NSURL URLWithString:str];

//创建一个请求对象

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

//异步连接,连接客户端和服务器

NSURLConnection *conection = [[NSURLConnection alloc] initWithRequest:request delegate:self];

    [conection start];
}

- (void)asynPOST
{

//创建一个字符串

NSString *str = @"http://ipad-bjwb.bjd.com.cn/DigitalPublication/pu blish/Handler/APINewsList.ashx";

//创建一个NSURL对象
NSURL *url = [NSURL URLWithString:str]; //创建POST请求对象,因为NSURLRequest这个类默认的请求方

式是GET,所以没法实现POST请求,我们采用 NSMutableURLRequest这个类来创建对象,post与get的最大区别在于,post请求将url中的参数部分分离出来

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];

//设置请求方式
[request setHTTPMethod:@"POST"];

//字符串转化为NSData对象 //分离出来的参数部分放到了body体里面

[request setHTTPBody:[@"date=20131129&startRecord=1&len=5&ud id=1234567890&terminalType=Iphone&cid=213" dataUsingEncoding:NSUTF8StringEncoding]];

//异步连接

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

// // //

if (connectionError) { NSLog(@"网络错误");

}else{

NSDictionary *dataDic = [NSJSONSerialization JSONObjectWithData:data

options:NSJSONReadingMutableContainers | NSJSONReadingMutableLeaves error:nil];

NSLog(@"%@",dataDic); // }

}]; }

[self.tableView reloadData];

//每日精选我们使用了Block,这个页面我们使用代理请求 NSURL *url = [NSURL

URLWithString:@"http://baobab.wandoujia.com/api/v1/ categories"];

NSURLRequest *request = [NSURLRequest requestWithURL:url];

//代理请求

[NSURLConnection connectionWithRequest:request delegate:self];

}

//- (NSURLRequest *)connection:(NSURLConnection *)connection willSendRequest:(NSURLRequest *)request redirectResponse:(NSURLResponse *)response
//{

//
//}
//可以接收到请求返回的response
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{

//初始化data,方便下面的方法做拼接(如果不在这里初始化, 可以做个懒加载);

self.pastData = [NSMutableData data]; }

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

//拼接数据

[self.pastData appendData:data]; }

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

//数据请求完毕后,对拼接完成的数据做解析

//因为数据的根目录是一个数组,所以我们拿一个数组来接收它 NSArray *array = [NSJSONSerialization

JSONObjectWithData:self.pastData options:0 error:nil];

//一般在forin前面初始化我们的数组.因为我们这里也不会去做上拉加载更多,所以我们用不到懒加载

self.array = [NSMutableArray array]; for (NSDictionary *dic in array) {

PastModel *model = [[PastModel alloc] initWithDictionary:dic];

[self.array addObject:model]; }

//刷新数据,一定要记得写,养成一个习惯,就像写; 一样.

[self.collectionView reloadData]; }