UI中多线程的创建以及定时器与图片的异步加载

- (void)viewDidLoad {

[super viewDidLoad];

_imgView = [[UIImageView alloc]initWithFrame:self.view.bounds];

_imgView.contentMode =  UIViewContentModeScaleAspectFit;

[self.view addSubview:_imgView];

// Do any additional setup after loading the view, typically from a nib.

//    //方法1

//    NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(test) object:nil];

//    [thread start];

//

//    //方法2

//    [self performSelectorInBackground:@selector(test) withObject:nil];

//      //方法3

//    [NSThread detachNewThreadSelector:@selector(test) toTarget:self withObject:nil];

//    //方法4 NSOperationQueue是一个操作队列或者线程池

NSOperationQueue *queue = [[NSOperationQueue alloc]init];

// queue.maxConcurrentOperationCount = 1;

//    [queue addOperationWithBlock:^{//往队列中添加一个操作

//        [self test];

//    }];

//    //方法5 不要直接去创建NSOperation对象

NSInvocationOperation *opertion = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(test) object:nil];

//    opertion.queuePriority = NSOperationQueuePriorityVeryLow;

//

//    NSInvocationOperation *opertion2 = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(test1) object:nil];

//    opertion2.queuePriority = NSOperationQueuePriorityVeryHigh;

//

//方法6

//    ThreadOperation *threadOperation = [[ThreadOperation alloc]init];

//    [queue addOperation:threadOperation];

[queue addOperation:opertion];

//    [queue addOperation:opertion2];

//    BOOL bool1 = [[NSThread currentThread]isMainThread];

//    NSLog(@"bool1 is %d",bool1);

//    for (int i = 0; i < 10; i ++) {

//        NSLog(@"-----------------main%d",i);

//    }

}

- (void)test{

@autoreleasepool {

// [NSThread sleepForTimeInterval:5];

//    BOOL bool2 = [[NSThread currentThread]isMainThread];

//    NSLog(@"bool2 is %d",bool2);

//    for (int i = 0; i < 10; i ++) {

//        NSLog(@"-----------------test%d",i);

//    }

//    [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(run:) userInfo:nil repeats:YES];

//    NSTimer *timer = [NSTimer timerWithTimeInterval:1 target:self selector:@selector(run:) userInfo:nil repeats:YES];

//    [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];

//

//    [[NSRunLoop currentRunLoop]run];

/*

http://d.hiphotos.baidu.com/image/w%3D310/sign=897718c6bd096b63811958513c328733/ac345982b2b7d0a28fc5db74c8ef76094a369acf.jpg

*/

// NSLog(@"1");

NSString *imgUrl = @"http://g.hiphotos.baidu.com/image/w%3D310/sign=2c97ee80d03f8794d3ff4e2fe21a0ead/f636afc379310a550dcbd3ccb34543a98226101e.jpg";

NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:imgUrl]];

// _imgView.image = [UIImage imageWithData:data];

[self performSelectorOnMainThread:@selector(show:) withObject:data waitUntilDone:NO];

}

}

- (void)run:(NSTimer *)timer{

}

- (void)show:(NSData *)data{

_imgView.image = [UIImage imageWithData:data];

}

//- (void)test1{

//    //[NSThread sleepForTimeInterval:5];

//    BOOL bool2 = [[NSThread currentThread]isMainThread];

//    NSLog(@"bool2 is %d",bool2);

//    for (int i = 0; i < 10; i ++) {

//        NSLog(@"-----------------test111111%d",i);

//    }

//}