NSOperation

NSOperation

ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.

  //队列 NSOperationQueue
  //任务 NSOperation
  // NSInvocationOperation
  // NSBlockOperation
  // 自定义任务 : NSOperation

  //A
  NSInvocationOperation *invocationOper = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(invocationSel) object:nil];

  //把任务加入到队列
  NSOperationQueue *queue = [[NSOperationQueue alloc] init];

  //B
  NSBlockOperation *blockOper = [NSBlockOperation blockOperationWithBlock:^{
  NSInteger i = 0;
  while (i < 100) {
  NSLog(@”%ld”,i++);
  }
  NSLog(@”%@”,[NSThread currentThread]);
  }];

  //依赖 必须在加入队列之前
  //blockOper 任务执行完成 在执行 invocationOper
  [invocationOper addDependency:blockOper]; //后面先执行

  //最大任务数
  //[queue setMaxConcurrentOperationCount:2];

// [queue addOperation:invocationOper];
// [queue addOperation:blockOper];

//image
self.imageView = [[UIImageView alloc] initWithFrame:self.view.bounds];

[self.view addSubview:self.imageView];

TQCustomOperation *oper = [[TQCustomOperation alloc] initWithBlock:^(id obj) {
    //刷新UI
    NSLog(@"%@",[NSThread currentThread]);
    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
        NSLog(@"%@",[NSThread currentThread]);
        self.imageView.image = [UIImage imageWithData:obj];
    }];
}];

[queue addOperation:oper];

}

-(void)invocationSel
{
NSInteger i = 999;
while (i < 1100) {
NSLog(@”%ld”,i++);
}
NSLog(@”%@”,[NSThread currentThread]);
}

TQCustomOperation.m

@implementation TQCustomOperation
{
returnData _block;
}

-(id)initWithBlock:(returnData)block
{
self = [super init];
if (self) {
_block = block;
}
return self;
}

-(void)main
{
NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:@”http://d.hiphotos.baidu.com/news/q%3D100/sign=2866acb5560fd9f9a6175169152fd42b/203fb80e7bec54e7f54f99d7be389b504ec26a5c.jpg“]];

if(_block != nil)
{
    _block(data);
}

}

@end