//在此之前要遵守协议<NSURLConnectionDataDelegate> 
 
#import "ViewController.h" 
#import "Cricl.h" 
@interface ViewController (){ 
    UITextField *_textField; 
    UIProgressView *_progressView; 
    UILabel *_label; 
    UIButton *_button; 
    Cricl *cricl; 
    long long _totalLength; 
    NSMutableData *_data; 
    UIImageView *imageOne; 
    UIImageView *imageTwo; 
    UIImageView *imageThree; 
    UIButton *buttonpause; 
    BOOL num; 
    NSTimer *timer; 
} 
@end 
 
@implementation ViewController 
 
- (void)viewDidLoad { 
    cricl = [[Cricl alloc]initWithFrame:CGRectMake(70,130, 375, 100)]; 
    cricl.backgroundColor = [UIColor colorWithRed:0.8 green:0.9 blue:0.8 alpha:0]; 
 
    imageOne = [[UIImageView alloc]initWithFrame:CGRectMake(20, 300, 160, 120)]; 
    [self.view addSubview:imageOne]; 
    imageTwo = [[UIImageView alloc]initWithFrame:CGRectMake(195, 300, 160, 120)]; 
    [self.view addSubview:imageTwo]; 
    imageThree = [[UIImageView alloc]init]; 
     
    [self.view addSubview:cricl]; 
    [super viewDidLoad]; 
    [self layout];//页面布局 
   } 
 
-(void)layout{ 
    self.view.backgroundColor = [UIColor colorWithRed:0.8 green:0.9 blue:0.8 alpha:1]; 
    //地址栏 
    _textField = [[UITextField alloc]initWithFrame:CGRectMake(10, 50, 355, 25)]; 
    _textField.borderStyle = UITextBorderStyleRoundedRect;//文本框边框样式(圆弧) 
    _textField.text = @"http://i-7.vcimg.com/trim/f7a6fc6ebf36475798dd3bf726288d5988839/trim.jpg"; 
    [self.view addSubview:_textField]; 
     
    _label = [[UILabel alloc]initWithFrame:CGRectMake(10, 110, 80, 25)]; 
//    _label.backgroundColor = [UIColor colorWithRed:0.8 green:0.9 blue:0.8 alpha:0.6]; 
    _label.text = @"正在下载"; 
    _label.font = [UIFont fontWithName:@"Arial" size:20]; 
    [self.view addSubview:_label]; 
     
    _progressView = [[UIProgressView alloc]initWithFrame:CGRectMake(30, 400, 335, 25)]; 
//    [self.view addSubview:_progressView]; 
     
     
    _button.layer.backgroundColor = [UIColor blackColor].CGColor; 
    _button = [[UIButton alloc]initWithFrame:CGRectMake(10, 500, 355, 25)]; 
    [_button setTitle:@"下载" forState:UIControlStateNormal]; 
    _button.backgroundColor = [UIColor colorWithRed:0.8 green:0.5 blue:0.7 alpha:0.6]; 
    [_button addTarget:self action:@selector(choose) forControlEvents:UIControlEventTouchUpInside]; 
    [self.view addSubview:_button]; 
     
    buttonpause = [[UIButton alloc]initWithFrame:CGRectMake(20, 600, 60, 25)]; 
    buttonpause.backgroundColor = [UIColor colorWithRed:0.8 green:0.5 blue:0.7 alpha:0.6]; 
    [buttonpause setTitle:@"暂停" forState:UIControlStateNormal]; 
    [buttonpause addTarget:self action:@selector(okpause) forControlEvents:UIControlEventTouchUpInside]; 
    [self.view addSubview:buttonpause]; 
} 
 
 
#pragma mark 更新进度条 
-(void)updateProgress{ 
    if(_data.length == _totalLength){ 
        _label.text = @"下载完成"; 
    } 
    else{ 
        _label.text = @"正在下载"; 
    } 
    cricl.value = (float)_data.length/_totalLength*2*M_PI; 
} 
#pragma mark 发送数据请求 
-(void)choose{ 
    NSLog(@"下载中..."); 
    NSString *urlStr; 
    if(num){ 
         urlStr= @"http://i-7.vcimg.com/trim/867a1fe997bf3baeebbd223ae9aecdc8142598/trim.jpg"; 
    } 
    else{ 
        urlStr=@"http://i-7.vcimg.com/trim/f7a6fc6ebf36475798dd3bf726288d5988839/trim.jpg"; 
    } 
    //对于url中的中文是无法解析的,需要进行url编码 
    urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 
//    urlStr = [urlStr stringByAddingPercentEncodingWithAllowedCharacters:NSCharacterSetURLQueryAllow] 
     
   //创建url链接 
    NSURL *url = [NSURL URLWithString:urlStr]; 
    //创建请求request 
    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:15.0f]; 
    //创建链接 
    NSURLConnection *connection = [[NSURLConnection alloc]initWithRequest:request delegate:self]; 
    //启动连接 
    [connection start]; 
     
} 
 
#pragma mark -开始代理方法 
#pragma mark -开始响应 
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{ 
    NSLog(@"接收响应"); 
    _data = [[NSMutableData alloc]init]; 
    //初始化,设置进度条进度 
    cricl.value = 0; 
    //处理响应 
    NSLog(@"%@",response); 
    //通过响应头中的content-Length取得整个响应的总长度 
    NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *)response; 
    NSDictionary *HeaderFields = [httpResponse allHeaderFields]; 
    NSLog(@"%@",HeaderFields); 
     
     
    _totalLength = [HeaderFields[@"Content-Length"] longLongValue]; 
//    NSLog(@"%lld",_totalLength); 
     
} 
 
#pragma mark 接收响应数据 
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data{ 
    NSLog(@"接收响应数据"); 
    [_data appendData:data]; 
    //更新进度条 
    [self updateProgress]; 
} 
 
#pragma mark 数据接收完成 
-(void)connectionDidFinishLoading:(NSURLConnection *)connection{ 
    NSLog(@"数据接收完成"); 
    //数据接收完保存文件(注意苹果官方要求:下载数据智能保存到缓存目录) 
    NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]; 
    NSLog(@"%@",path); 
    path=[path stringByAppendingPathComponent:@"下载图片01.jpg"]; 
    //保存下载内容 
    [_data writeToFile:path atomically:YES]; 
    if(num){ 
        imageOne.image = [UIImage imageWithData:_data]; 
        num = NO; 
    } 
    else{ 
        imageTwo.image = [UIImage imageWithData:_data]; 
        num = YES; 
        
    } 
    timer = [NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(convert) userInfo:nil repeats:YES]; 
} 
 
 
#pragma mark 请求失败 
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{ 
    NSLog(@"请求失败:%@",error); 
} 
-(void)okpause{ 
    [timer invalidate]; 
    timer = nil; 
} 
-(void)convert{ 
    NSDate *date = [[NSDate alloc]init]; 
    imageThree.image = imageOne.image; 
    imageOne.image = imageTwo.image; 
    imageTwo.image = imageThree.image; 
    NSLog(@"%@",date); 
     
} 
 
#import "Cricl.h" 
 
@implementation Cricl 
 
 
- (void)drawRect:(CGRect)rect { 
    CGContextRef context = UIGraphicsGetCurrentContext(); 
    [self drawArc:context]; 
} 
 
-(void)setValue:(float)value{ 
    _value = value; 
    [self setNeedsDisplay]; 
} 
 
-(void)drawArc:(CGContextRef)context{ 
    CGContextMoveToPoint(context, 220/2.0, 100/2.0); 
    [[UIColor redColor]set]; 
    CGContextAddArc(context, 220/2.0, 100/2.0, 100/2.0, 0, _value, 0); 
    CGContextDrawPath(context, kCGPathFillStroke); 
} 
 
@end 
 
 
//简化请求和响应 
 
#import "ViewController.h" 
 
@interface ViewController (){ 
    UILabel *_label; 
    UIButton *_button; 
    UITextField *_field; 
    long long _totalLength; 
    UIImageView *imageOne; 
    UIImageView *imageTwo; 
    BOOL num; 
} 
 
@end 
 
@implementation ViewController 
 
- (void)viewDidLoad { 
    [super viewDidLoad]; 
    [self layout]; 
} 
-(void)layout{ 
    imageOne =[[UIImageView alloc]initWithFrame:CGRectMake(20, 300, 100, 100)]; 
    [self.view addSubview:imageOne]; 
     
    imageTwo = [[UIImageView alloc]initWithFrame:CGRectMake(150, 300, 100, 100)]; 
    [self.view addSubview:imageTwo]; 
     
     
    _field = [[UITextField alloc]initWithFrame:CGRectMake(10, 50, 355, 25)]; 
    _field.borderStyle = UITextBorderStyleRoundedRect; 
    _field.text = @"http://5.26923.com/download/pic/000/328/ba80a24af0d5aba07e1461eca71f9502.jpg"; 
    [self.view addSubview:_field]; 
     
    _label = [[UILabel alloc]initWithFrame:CGRectMake(10, 90, 100, 25)]; 
    _label.text = @"图片"; 
    [self.view addSubview:_label]; 
     
    _button = [[UIButton alloc]initWithFrame:CGRectMake(10,500, 355, 25)]; 
    _button.backgroundColor = [UIColor colorWithRed:0.8 green:0.9 blue:0.8 alpha:0.6]; 
    [_button setTitle:@"正在下载" forState:UIControlStateNormal]; 
    [_button addTarget:self action:@selector(sendRequst) forControlEvents:UIControlEventTouchUpInside]; 
    [self.view addSubview:_button]; 
} 
-(void)sendRequst{ 
    //发送网址,并将其转换成utf8网络字节序 
    NSString *urlStr = _field.text; 
    NSLog(@"xxxx%@",urlStr); 
    urlStr = [urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; 
    //连接与网络 
    NSURL *url = [NSURL URLWithString:urlStr]; 
    //发送请求和网络 
    NSURLRequest *request = [[NSURLRequest alloc]initWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10.0f]; 
    //同步所表示文件原件的发送必须到达才可执行下一步,异步可以进行后台 
    //发送异步请求 
    [NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) { 
        NSString *path = [NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject]; 
        NSLog(@"%@",path); 
         
        path = [path stringByAppendingPathComponent:@"图片01.jpg"]; 
        [data writeToFile:path atomically:YES]; 
        NSLog(@"%i",num); 
        if(num){ 
                imageOne.image = [UIImage imageWithData:data]; 
                  num = NO; 
             
            }else{ 
                imageTwo.image = [UIImage imageWithData:data]; 
                num= YES; 
            } 
         
    }]; 
     
} 

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