-(void)testNSURLConnectionSyncDownloadData
{//限免页面接口NSString *urlString=@"http://iappfree.candou.com:8080/free/applications/limited?currency=rmb&page=1&category_id=";//发送同步URL请求//NSURLRequest URL请求对象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(@"下载失败");}
}

-(void)testNSURLConnectionAsyncDownloadData
{_data=[[NSMutableData alloc]init];//限免页面接口NSString *urlString=@"http://iappfree.candou.com:8080/free/applications/limited?currency=rmb&page=1&category_id=";//发起一个异步URL请求//异步：执行了方法之后，开始下载_connection=[[NSURLConnection alloc]initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlString]] delegate:self startImmediately:YES];}
//下面是<NSURLConnectionDataDelegate>代理方法
//接收到服务器响应执行
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{NSLog(@"接收到服务器响应执行");
}
//接收到数据的时候执行
//注意：当数据比较大，可能会多次执行
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{[_data appendData:data];
}
//当数据下载完成了
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{
//    NSLog(@"str =%@",[[NSString alloc]initWithData:_data encoding:NSUTF8StringEncoding]);//解析JSON (把JSON转化为NSArray或NSDictionaryNSDictionary *dict=[NSJSONSerialization JSONObjectWithData:_data options:NSJSONReadingMutableContainers error:nil];NSArray *appList=dict[@"applications"];for (NSDictionary *appDict in appList) {NSLog(@"name = %@",appDict[@"name"]);}
}
//下载失败
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{NSLog(@"error =%@",error);
}

#import <Foundation/Foundation.h>@interface ZJHttpRequset : NSObject//data用来保存下载的数据
@property (nonatomic,copy) NSMutableData *data;//传人一个网站，下载完成之后，执行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"//类扩展，有些实例变量内部使用，不想放在头文件，就可以放在类扩展里面。
@interface ZJHttpRequset ()<NSURLConnectionDataDelegate>
{NSURLConnection *_connection;//用来保存存进来的url  target actionNSString *_url;id _target;SEL _action;
}
@end@implementation ZJHttpRequset-(void)requestWithUrl:(NSString *)url target:(id)target action:(SEL)action
{//保存存进来的变量_url=url;_target=target;_action=action;//记住要初始化data！！！_data=[[NSMutableData alloc]init];//发起异步URL请求_connection=[[NSURLConnection alloc]initWithRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:url]] delegate:self startImmediately:YES];
}
//NSURLConnection代理方法
//接收数据
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{[_data appendData:data];
}//下载完成了，执行方法
-(void)connectionDidFinishLoading:(NSURLConnection *)connection
{if (_target&&[_target respondsToSelector:_action]) {[_target performSelector:_action withObject:self];}//这里面的Object就是这个类本身，目的是把接收到的data传递
}

@implementation ViewController- (void)viewDidLoad
{[super viewDidLoad];//数据接口NSString *urlString=@"http://iappfree.candou.com:8080/free/applications/limited?currency=rmb&page=1&category_id=";//初始化数组（tabelView的数据总数组)_dataArray =[NSMutableArray array];//初始化自封装好的NSURLConnection类_request=[[ZJHttpRequset alloc]init];[_request requestWithUrl:urlString target:self action:@selector(dealDownloadFinish:)];//创建表视图
    [self createTableView];
}//接收完成之后会触发的方法（在自封装的URL类中 使用PerformSelector）
-(void)dealDownloadFinish:(ZJHttpRequset *)request
{//JSON解析，（获得的是数组还是字典，需要在JASON软件中查看）NSDictionary *dict=[NSJSONSerialization JSONObjectWithData:request.data
options:NSJSONReadingMutableContainers error:nil];NSArray *appList=dict[@"applications"];//利用数据模型保存网络接口下的数据，然后把模型添加到tableView总数组for (NSDictionary *appDict in appList) {AppModel *model=[[AppModel alloc]initWithDict:appDict];[_dataArray addObject:model];}//下载完数据，更新了总数组，一定要刷新tableview！！！
    [_tableView reloadData];
}

//第一步：初始化，从网络接口下载数据
-(void)createScrollView
{_allData1=[NSMutableArray array];//陈奕迅网络接口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：下载完成后触发的方法，把下载好的data 存入总数组
-(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:根据下载的总数组，改变ScrollView的contenSize 同时设置其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];}//设置pageControl _pageControl.numberOfPages=_allData1.count;_pageControl.enabled=NO;[self.view bringSubviewToFront:_pageControl];_pageControl.pageIndicatorTintColor=[UIColor redColor];//启动定时器，让scroView滑动[NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(scrollViewMove) userInfo:nil repeats:YES];
}
//定时器触发的方法
-(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> 代理方法让pageControl跟着移动
-(void)scrollViewDidScroll:(UIScrollView *)scrollView
{int page =scrollView.contentOffset.x/320;_pageControl.currentPage=page;
}