NSOperationQueue

 

#import <UIKit/UIKit.h>

@interface VCRoot : UIViewController

@end
#import "VCRoot.h"

@interface VCRoot ()
@property (assign,atomic) int count ;
@end

@implementation VCRoot
{
    //任务队列
    //能够将任务(线程的抽象)添加到队列中来管理
    //能够同时并发多个任务
    NSOperationQueue* _optQueue ;
    NSData* data  ;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    //建立一个任务队列
    //队列中的元素为任务对象
    //任务对象继承于NSOperation
    _optQueue = [[NSOperationQueue alloc] init] ;
    
    //设置任务的最大并发数量
    [_optQueue setMaxConcurrentOperationCount:5] ;
}

-(void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    //建立一个任务对象
    //将事件函数封装到任务中
    //未来在队列中执行
    NSInvocationOperation* tast01 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(updateOpt01) object:nil] ;
    //将任务添加到队列中
    [_optQueue addOperation:tast01] ;
    
    
    //方法二
    //建立一个任务属性对象
    NSInvocation* invo = [[NSInvocation alloc] init] ;
    //目标对象
    invo.target = self ;
    //事件函数
    invo.selector = @selector(updateOpt02) ;
    
    NSInvocationOperation* tast02 = [[NSInvocationOperation alloc] initWithInvocation:invo] ;
    //将第二个任务添加到队列中
    [_optQueue addOperation:tast02] ;
    
    
    //方法三
    NSMutableArray* arrayTask = [[NSMutableArray alloc] init] ;
    for (int i = 0 ; i < 3; i++)
    {
        //建立多个任务,将任务添加到数组中
        NSInvocationOperation* task = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(updateOpt) object:nil] ;
    
        [arrayTask addObject:task] ;
    }
    //将任务数组添加到任务队列中
    //是否等待以前的任务结束后开始执行
    [_optQueue addOperations:arrayTask waitUntilFinished:YES] ;
    
//    第四种方法,使用block来添加任务
//    添加一个block块对象做为任务队列的任务
    [_optQueue addOperationWithBlock:^
    {
        int count = 0 ;
        for (int i = 0 ; i < 10000; i++)
        {
            count++ ;
            NSLog(@"count = %d",count) ;
        }
    }] ;
}

-(void) readFile
{
    data = [NSData dataWithContentsOfFile:@"/users/qianfeng/Desktop/office.zip"] ;
}

-(void) updateOpt01
{
    NSLog(@"任务一执行....");
    
    [data writeToFile:@"/users/qianfeng/Desktop/office01.zip" atomically:YES] ;
    
//    [NSThread exit] ;
    
    NSThread* t = [NSThread currentThread] ;
    [t cancel] ;
    while (true)
    {
        //休眠时间
        [NSThread sleepForTimeInterval:0.01] ;
        NSLock* lock = [[NSLock alloc] init] ;
        
        int k = 0 ;
        
        [lock lock] ;
        k++ ;
        [lock unlock] ;
        
        [NSThread isMainThread] ;
    }

}

-(void) updateOpt11
{
    NSLog(@"任务一执行....");
    
    [data writeToFile:@"/users/qianfeng/Desktop/office02.zip" atomically:YES] ;
}

-(void) updateOpt12
{
    NSLog(@"任务一执行....");
    
    [data writeToFile:@"/users/qianfeng/Desktop/office03.zip" atomically:YES] ;
}

-(void) updateOpt02
{
    NSLog(@"任务二执行...");
}

-(void) updateOpt
{
    NSLog(@"任务数组中的任务执行!");
    [NSThread sleepForTimeInterval:5];
}

@end