UI-NSOperation线程

 1 #pragma mark  NSBlockOperation和 NSOperationQueue 的搭配
 2 
 3 - (void)viewDidLoad {
 4 
 5     [super viewDidLoad];
 6 
 7 //    1、创建视图
 8 
 9         imageView = [[UIImageView alloc]initWithFrame:CGRectMake(50, 50, 200, 200)];
10 
11         [self.view addSubview:imageView];
12 
13 //    2、创建一个线程操作
14 
15     NSBlockOperation *blockOperation = [NSBlockOperation blockOperationWithBlock:^{
16 
17         
18 
19 //        5、加载网络资源
20 
21         NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:kurl]];
22 
23         
24 
25         UIImage *image = [UIImage imageWithData:data];
26 
27         
28 
29 //        6、返回主线程
30 
31         [[NSOperationQueue mainQueue]addOperationWithBlock:^{
32 
33              
34 
35 //        7、在主线程更新UI
36 
37             imageView.image =image;
38 
39         }];
40 
41     }];
42 
43 //    3、创建一个线程队列
44 
45     NSOperationQueue *operationQueue = [NSOperationQueue new];
46 
47 //    4、把线程操作放到线程操作队列里
48 
49     [operationQueue addOperation:blockOperation];
50 
51 }
52 
53 @end