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一. (1)导入三方库 AFNetworking 和 SDWebImage （MRC时：-fno-objc-arc） (2) - (void)viewDidLoad { [super viewDidLoad]; [self createUI]; } -(void)createUI { for(int i = 0;i<4;i++) { UIImageView * imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 64 + 104 * i, 320, 104)]; imageView.tag = i + 1; [self.view addSubview:imageView]; }
UIBarButtonItem * item = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(pressBarBtn:)]; self.navigationItem.rightBarButtonItem = item; } (3)按钮响应方法-(void)pressBarBtn:(id)sender { //多个任务异步请求数据 NSString * path1 = @"http://mp./pic/act/banner_20150416144658_20150514104127.jpg"; //<1>转化成NSURL NSURL * url1 = [NSURL URLWithString:path1]; //<2>封装成请求对象 NSURLRequest * request1 = [NSURLRequest requestWithURL:url1]; //<3>开始异步请求 AFHTTPRequestOperation * operation1 = [[AFHTTPRequestOperation alloc]initWithRequest:request1]; //<4>请求结束以后 将请求的数据显示在UIImageView上 [operation1 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { UIImageView * imageView = (UIImageView *)[self.view viewWithTag:1]; //将请求的数据转化成UIImage添加到图片视图上 imageView.image = [UIImage imageWithData:responseObject]; NSLog(@"request1"); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"%@",error.description); }];
NSString * path2 = @"http://10.0.8.8/sns/attachment/201412/20/93916_1419040676yd6Q.jpg"; //<1>转化成NSURL NSURL * url2 = [NSURL URLWithString:path2]; //<2>封装成请求对象 NSURLRequest * request2 = [NSURLRequest requestWithURL:url2]; //<3>开始异步请求 AFHTTPRequestOperation * operation2 = [[AFHTTPRequestOperation alloc]initWithRequest:request2]; //<4>请求结束以后 将请求的数据显示在UIImageView上 [operation2 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { UIImageView * imageView = (UIImageView *)[self.view viewWithTag:2]; //将请求的数据转化成UIImage添加到图片视图上 imageView.image = [UIImage imageWithData:responseObject]; NSLog(@"request2"); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"%@",error.description); }];
NSString * path3 = @"http://mp./pic/act/banner_20150520104032.jpg"; //<1>转化成NSURL NSURL * url3 = [NSURL URLWithString:path3]; //<2>封装成请求对象 NSURLRequest * request3 = [NSURLRequest requestWithURL:url3]; //<3>开始异步请求 AFHTTPRequestOperation * operation3 = [[AFHTTPRequestOperation alloc]initWithRequest:request3]; //<4>请求结束以后 将请求的数据显示在UIImageView上 [operation3 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { UIImageView * imageView = (UIImageView *)[self.view viewWithTag:3]; //将请求的数据转化成UIImage添加到图片视图上 imageView.image = [UIImage imageWithData:responseObject]; NSLog(@"request3"); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"%@",error.description); }];
NSString * path4 = @"http://mp./pic/act/banner_20150518145310.jpg"; //<1>转化成NSURL NSURL * url4 = [NSURL URLWithString:path4]; //<2>封装成请求对象 NSURLRequest * request4 = [NSURLRequest requestWithURL:url4]; //<3>开始异步请求 AFHTTPRequestOperation * operation4 = [[AFHTTPRequestOperation alloc]initWithRequest:request4]; //<4>请求结束以后 将请求的数据显示在UIImageView上 [operation4 setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { UIImageView * imageView = (UIImageView *)[self.view viewWithTag:4]; //将请求的数据转化成UIImage添加到图片视图上 imageView.image = [UIImage imageWithData:responseObject]; NSLog(@"request4"); } failure:^(AFHTTPRequestOperation *operation, NSError *error) { NSLog(@"%@",error.description); }];
//<5>将多个请求对象放在一个队列中 NSOperationQueue * queue = [[NSOperationQueue alloc]init]; //<6>设置队列中最大承载的请求对象的个数 queue.maxConcurrentOperationCount = 4; //<7>将4个请求放在队列中开始异步请求 [queue addOperations:@[operation1,operation2,operation3,operation4] waitUntilFinished:NO];
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