NSThread、NSOperation/NSOperationQueue、GCD多線程

@interface ViewController (){

}

@property (nonatomic,strong) NSNumber *dataInt;

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    //NsThread

    //[self threadDemo];

    //GCD

    //[self gcdDemo];

    //

    [self operationDemo];

}

-(void)operationDemo{

    //Operation隊列

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

    //設定最大的并發執行線程的數量

    queue.maxConcurrentOperationCount = 4;

//    1.operation 1 

    //NSInvocationOperation 操作

//    NSInvocationOperation *operation = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(updateUI2) object:nil];

//    [operation start];

//    1.operation 2

    NSBlockOperation *blockOper = [NSBlockOperation blockOperationWithBlock:^{

        //這個也是更新UI的一種方式

        [[NSOperationQueue mainQueue] addOperationWithBlock:^{

            [self updateUI];

        }];

    }];

    //将NSBlockOperation添加到queue隊列 ，添加到隊列之後即将執行

    [queue addOperation:blockOper];

//    queue addOperations: NSOperation數組 waitUntilFinished:NO];

}

-(void)gcdDemo{

    //擷取全局隊列的方法  第一個參數是配置設定的一個處理事務的程式優先級 0為預設  2 為高，-2為低

    dispatch_queue_t queue = dispatch_get_global_queue(0, 0);

    //線程異步

    dispatch_async(queue, ^{

        NSLog(@"線程異步");

        //通知主線程重新整理界面的第一種方式  子線程不能更新UI

        dispatch_async(dispatch_get_main_queue(), ^{

        });

        //子線程更新UI的第二種方式

        [self performSelectorOnMainThread:@selector(updateUI) withObject:self waitUntilDone:YES];

        NSLog(@"%@",[NSThread currentThread]);

    });

    //線程同步  使用串行隊列

    queue = dispatch_queue_create("queue", 0);

    //線程同步   第一個參數是指定一個gcd隊列  第二個參數是配置設定一個處理事務的程式到該隊列

    dispatch_sync(queue, ^{

        NSLog(@"線程同步");

    });

}

-(void)updateUI{

    //

    NSLog(@"%@",[NSThread currentThread]);

    UIImageView *image = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];

    image.image = [UIImage imageNamed:@"car.png"];

    [self.view addSubview:image];

}

-(void)updateUI2{

    //

    dispatch_async(dispatch_get_main_queue(), ^{

        NSLog(@"%@",[NSThread currentThread]);

        UIImageView *image = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];

        image.image = [UIImage imageNamed:@"car.png"];

        [self.view addSubview:image];

    });

}

-(void)threadDemo{

    //1.線程等待的代碼

    for (int i; i<1; i++) {

        //這個是線程等待  機關是秒

        [NSThread sleepForTimeInterval:1];

        NSLog(@"%d",i);

    }

    _dataInt = [[NSNumber alloc]initWithInt:1];

    //    2.建立線程的第一種方式

    NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(threadTest:) object:_dataInt];

    [thread start];

    _dataInt = [[NSNumber alloc]initWithInt:2];

    //    3.建立線程的第二種方式 不需要start

    [NSThread detachNewThreadSelector:@selector(threadTest:) toTarget:self withObject:_dataInt];

}

-(void)threadTest:(NSNumber *)dataInt{

    NSLog(@"線程進來了%@",dataInt);

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end