-(void)testNSURLConnectionSyncDownloadData{    //限免頁面接口    NSString *urlString=@"http://iappfree.candou.com:8080/free/applications/limited?currency=rmb&page=1&category_id=";        //發(fā)送同步URL請(qǐng)求    //NSURLRequest URL請(qǐng)求對(duì)象    NSURL *url=[NSURL URLWithString:urlString];    NSURLRequest *request=[NSURLRequest requestWithURL:url];    NSError *error=nil;    NSData *data=[NSURLConnection sendSynchronousRequest:request returningResponse:nil error:&error];    if (error==nil) {        NSString *str=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];        NSLog(@"str = %@",str);    }    else {        NSLog(@"下載失敗");    }}

-(void)testNSURLConnectionAsyncDownloadData{    _data=[[NSMutableData alloc]init];    //限免頁面接口    NSString *urlString=@"http://iappfree.candou.com:8080/free/applications/limited?currency=rmb&page=1&category_id=";    //發(fā)起一個(gè)異步URL請(qǐng)求    //異步：執(zhí)行了方法之后，開始下載    _connection=[[NSURLConnection alloc]initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]] delegate:self startImmediately:YES];    }//下面是<NSURLConnectionDataDelegate>代理方法//接收到服務(wù)器響應(yīng)執(zhí)行-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{    NSLog(@"接收到服務(wù)器響應(yīng)執(zhí)行");}//接收到數(shù)據(jù)的時(shí)候執(zhí)行//注意：當(dāng)數(shù)據(jù)比較大，可能會(huì)多次執(zhí)行-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{    [_data appendData:data];}//當(dāng)數(shù)據(jù)下載完成了-(void)connectionDidFinishLoading:(NSURLConnection *)connection{//    NSLog(@"str =%@",[[NSString alloc]initWithData:_data encoding:NSUTF8StringEncoding]);        //解析JSON (把JSON轉(zhuǎn)化為NSArray或NSDictionary    NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:_data options:NSJSONReadingMutableContainers error:nil];    NSArray *appList=dict[@"applications"];    for (NSDictionary *appDict in appList) {        NSLog(@"name = %@",appDict[@"name"]);    }}//下載失敗-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{    NSLog(@"error =%@",error);}

#import <Foundation/Foundation.h>@interface ZJHttPRequset : NSObject//data用來保存下載的數(shù)據(jù)@property (nonatomic,copy) NSMutableData *data;//傳人一個(gè)網(wǎng)站，下載完成之后，執(zhí)行target中action的方法-(void)requestWithUrl:(NSString *)url target:(id)target action:(SEL)action;@end

#import "ZJHttpRequset.h"#import "AppModel.h"//消除performSelector的警告#pragma clang diagnostic ignored "-Warc-performSelector-leaks"//類擴(kuò)展，有些實(shí)例變量?jī)?nèi)部使用，不想放在頭文件，就可以放在類擴(kuò)展里面。@interface ZJHttpRequset ()<NSURLConnectionDataDelegate>{    NSURLConnection *_connection;        //用來保存存進(jìn)來的url  target action    NSString *_url;    id _target;    SEL _action;}@end@implementation ZJHttpRequset-(void)requestWithUrl:(NSString *)url target:(id)target action:(SEL)action{    //保存存進(jìn)來的變量    _url=url;    _target=target;    _action=action;        //記住要初始化data！！！    _data=[[NSMutableData alloc]init];    //發(fā)起異步URL請(qǐng)求    _connection=[[NSURLConnection alloc]initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:url]] delegate:self startImmediately:YES];}//NSURLConnection代理方法//接收數(shù)據(jù)-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{    [_data appendData:data];}//下載完成了，執(zhí)行方法-(void)connectionDidFinishLoading:(NSURLConnection *)connection{    if (_target&&[_target respondsToSelector:_action]) {        [_target performSelector:_action withObject:self];    }    //這里面的Object就是這個(gè)類本身，目的是把接收到的data傳遞}

@implementation ViewController- (void)viewDidLoad{    [super viewDidLoad];    //數(shù)據(jù)接口    NSString *urlString=@"http://iappfree.candou.com:8080/free/applications/limited?currency=rmb&page=1&category_id=";    //初始化數(shù)組（tabelView的數(shù)據(jù)總數(shù)組)    _dataArray =[NSMutableArray array];    //初始化自封裝好的NSURLConnection類    _request=[[ZJHttpRequset alloc]init];    [_request requestWithUrl:urlString target:self action:@selector(dealDownloadFinish:)];        //創(chuàng)建表視圖    [self createTableView];}//接收完成之后會(huì)觸發(fā)的方法（在自封裝的URL類中 使用PerformSelector）-(void)dealDownloadFinish:(ZJHttpRequset *)request{    //JSON解析，（獲得的是數(shù)組還是字典，需要在JASON軟件中查看）    NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:request.data options:NSJSONReadingMutableContainers error:nil];    NSArray *appList=dict[@"applications"];    //利用數(shù)據(jù)模型保存網(wǎng)絡(luò)接口下的數(shù)據(jù)，然后把模型添加到tableView總數(shù)組    for (NSDictionary *appDict in appList) {                AppModel *model=[[AppModel alloc]initWithDict:appDict];                [_dataArray addObject:model];    }    //下載完數(shù)據(jù)，更新了總數(shù)組，一定要刷新tableview！！！    [_tableView reloadData];}

//第一步：初始化，從網(wǎng)絡(luò)接口下載數(shù)據(jù)-(void)createScrollView{    _allData1=[NSMutableArray array];    //陳奕迅網(wǎng)絡(luò)接口    NSString *urlString=@"http://mapi.damai.cn/hot201303/nindex.aspx?cityid=0&source=10099&version=30602";    _request1 =[[LCHttpRequest alloc]init];    [_request1 requestUrl:urlString withTarget:self andAction:@selector(scrollViewDownload:)];    }//第二步：下載完成后觸發(fā)的方法，把下載好的data 存入總數(shù)組-(void)scrollViewDownload:(LCHttpRequest *)request{    NSArray *arr=[NSJSONSerialization JSONObjectWithData:request.data options:NSJSONReadingMutableContainers error:nil];    for (NSDictionary *dict in arr) {        NSString *str=dict[@"Pic"];        [_allData1 addObject:str];    }    [self loadImage];}//第三步:根據(jù)下載的總數(shù)組，改變ScrollView的contenSize 同時(shí)設(shè)置其imageView-(void)loadImage{    _scrollView.contentSize=CGSizeMake(320*_allData1.count, 0);    for (int i=0; i<_allData1.count; i++) {        UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(320*i, 0, 320, 165)];        NSString *str= _allData1[i];        [imageView setImageWithURL:[NSURL URLWithString:str]];        [_scrollView addSubview:imageView];    }    //設(shè)置pageControl     _pageControl.numberOfPages=_allData1.count;    _pageControl.enabled=NO;    [self.view bringSubviewToFront:_pageControl];    _pageControl.pageIndicatorTintColor=[UIColor redColor];    //啟動(dòng)定時(shí)器，讓scroView滑動(dòng)    [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(scrollViewMove) userInfo:nil repeats:YES];}//定時(shí)器觸發(fā)的方法-(void)scrollViewMove{    CGPoint pp=_scrollView.contentOffset;    if (pp.x==320*(_allData1.count-1)) {        pp.x=0;        _scrollView.contentOffset=pp;    }    else{        pp.x+=320;    [UIView animateWithDuration:2.0 animations:^{        _scrollView.contentOffset=pp;    }];    }}//<UIScrllViewDelegate> 代理方法讓pageControl跟著移動(dòng)-(void)scrollViewDidScroll:(UIScrollView *)scrollView{    int page =scrollView.contentOffset.x/320;    _pageControl.currentPage=page;}