NSOperation多线程方式

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}
//NSOperation的子类NSInvocationOperation
//NSOperation 是一个抽象类(NSURLSession也是抽象类,用来封装子类,并不直接调用),与多线程没有关系,它是数据模型,保存代码段和数据
- (IBAction)invocationOperation:(id)sender {
    NSInvocationOperation *invocationOp = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(loopIn) object:nil];
    //执行操作
    [invocationOp start];
    
    
    
}
-(void)loopIn
{
    
    for (int i = 0; i < 1000; i++) {
        //NSLog(@"a");
        NSLog(@"%@",[NSThread currentThread]);
    }
}
- (IBAction)blockOperation:(UIButton *)sender {
    
    NSBlockOperation *blockOp = [NSBlockOperation blockOperationWithBlock:^{
       //需要在线程里执行的内容
        for (int i = 0; i < 8; i++) {
            NSLog(@"%@",[NSThread currentThread]);
        }
    }];
    [blockOp start];
    
}
//线程队列
- (IBAction)operationQueue:(id)sender {
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    //可以创建队列后,设置最大的并发数
    queue.maxConcurrentOperationCount = 2;
    //循环添加一百个NSOperation
    for (int i = 0; i < 100; i++) {
        NSBlockOperation *blockOp = [NSBlockOperation blockOperationWithBlock:^{
            NSLog(@"%@",[NSThread currentThread]);
        }];
        //添加操作到线程队列中,添加后自动执行,不需要start
        [queue addOperation:blockOp];
    }
    
}
- (IBAction)invocationQueue:(id)sender {
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    queue.maxConcurrentOperationCount = 2;
    for (int i = 0; i < 100; i++) {
        NSInvocationOperation *invocationOp = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(mengdefeng) object:nil];
        
        [queue addOperation:invocationOp];
    }
    
   
    
}
//输出当前线程
-(void)mengdefeng
{
    NSLog(@"%@",[NSThread currentThread]);
}
//线程的优先级
- (IBAction)queuePriority:(id)sender {
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    //设置最大并发数
    queue.maxConcurrentOperationCount = 1;
    for (int i = 0; i < 100; i++) {
        
        NSBlockOperation *blockOp1 = [NSBlockOperation blockOperationWithBlock:^{
            NSLog(@"1");
        }];
        NSBlockOperation *blockOp2 = [NSBlockOperation blockOperationWithBlock:^{
            NSLog(@"2");
        }];
        //设置操作的优先级
        blockOp1.queuePriority = NSOperationQueuePriorityVeryLow;
        blockOp2.queuePriority = NSOperationQueuePriorityVeryHigh;
        [queue addOperation:blockOp1];
        [queue addOperation:blockOp2];
    }
    
    
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

@end