源码0502-02-了解-NSOperation基本使用

最新推荐文章于 2024-08-11 19:11:11 发布

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最新推荐文章于 2024-08-11 19:11:11 发布

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原文链接：http://www.cnblogs.com/laugh/p/6565425.html

本文详细介绍了如何使用NSOperation及NSOperationQueue进行多线程任务管理，包括基本使用、队列配置、操作依赖设置以及线程间通信技巧。

使用NSOperation子类的方式有3种
NSInvocationOperation
NSBlockOperation
自定义子类继承NSOperation，实现内部相应的方法

//  ViewController.m
//  02-了解-NSOperation基本使用
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

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

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [self blockOperation];
}

- (void)blockOperation
{
    NSBlockOperation *op = [NSBlockOperation blockOperationWithBlock:^{
        // 在主线程
        NSLog(@"下载1------%@", [NSThread currentThread]);
    }];
    
    // 添加额外的任务(在子线程执行)
    [op addExecutionBlock:^{
        NSLog(@"下载2------%@", [NSThread currentThread]);
    }];

    [op addExecutionBlock:^{
        NSLog(@"下载3------%@", [NSThread currentThread]);
    }];
    [op addExecutionBlock:^{
        NSLog(@"下载4------%@", [NSThread currentThread]);
    }];
    
    [op start];
}

- (void)invocationOperation
{
    NSInvocationOperation *op = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(run) object:nil];

    [op start];
}

- (void)run
{
    NSLog(@"------%@", [NSThread currentThread]);
}

@end

//  ViewController.m
//  03-掌握-NSOperationQueue
#import "ViewController.h"
#import "XMGOperation.h"

@interface ViewController ()
/** 队列 */
@property (nonatomic, strong) NSOperationQueue *queue;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // 创建队列
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    
    // 设置最大并发操作数
//    queue.maxConcurrentOperationCount = 1; // 就变成了串行队列
//    
//    // 添加操作
//    [queue addOperationWithBlock:^{
////        NSLog(@"download1 --- %@", [NSThread currentThread]);
////        [NSThread sleepForTimeInterval:1.0];
//        for (NSInteger i = 0; i<5000; i++) {
//            NSLog(@"download1 -%zd-- %@", i, [NSThread currentThread]);
//        }
//    }];
//    [queue addOperationWithBlock:^{
////        NSLog(@"download2 --- %@", [NSThread currentThread]);
//        //        [NSThread sleepForTimeInterval:1.0];
//        for (NSInteger i = 0; i<1000; i++) {
//            NSLog(@"download2 --- %@", [NSThread currentThread]);
//        }
//    }];
//    [queue addOperationWithBlock:^{
////        NSLog(@"download3 --- %@", [NSThread currentThread]);
////        [NSThread sleepForTimeInterval:1.0];
//        for (NSInteger i = 0; i<1000; i++) {
//            NSLog(@"download3 --- %@", [NSThread currentThread]);
//        }
//    }];
    
    [queue addOperation:[[XMGOperation alloc] init]];
    
    self.queue = queue;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
//    if (self.queue.isSuspended) {
//        // 恢复队列，继续执行
//        self.queue.suspended = NO;
//    } else {
//        // 暂停（挂起）队列，暂停执行
//        self.queue.suspended = YES;
//    }
    
    [self.queue cancelAllOperations];
}

- (void)opetationQueue3
{
    // 创建队列
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    
    // 设置最大并发操作数
    //    queue.maxConcurrentOperationCount = 2;
    queue.maxConcurrentOperationCount = 1; // 就变成了串行队列
    
    // 添加操作
    [queue addOperationWithBlock:^{
        NSLog(@"download1 --- %@", [NSThread currentThread]);
        [NSThread sleepForTimeInterval:0.01];
    }];
    [queue addOperationWithBlock:^{
        NSLog(@"download2 --- %@", [NSThread currentThread]);
        [NSThread sleepForTimeInterval:0.01];
    }];
    [queue addOperationWithBlock:^{
        NSLog(@"download3 --- %@", [NSThread currentThread]);
        [NSThread sleepForTimeInterval:0.01];
    }];
    [queue addOperationWithBlock:^{
        NSLog(@"download4 --- %@", [NSThread currentThread]);
        [NSThread sleepForTimeInterval:0.01];
    }];
    [queue addOperationWithBlock:^{
        NSLog(@"download5 --- %@", [NSThread currentThread]);
        [NSThread sleepForTimeInterval:0.01];
    }];
    [queue addOperationWithBlock:^{
        NSLog(@"download6 --- %@", [NSThread currentThread]);
        [NSThread sleepForTimeInterval:0.01];
    }];
}

- (void)operationQueue2
{
    // 创建队列
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    
    // 创建操作
    //    NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{
    //        NSLog(@"download1 --- %@", [NSThread currentThread]);
    //    }];
    
    // 添加操作到队列中
    //    [queue addOperation:op1];
    [queue addOperationWithBlock:^{
        NSLog(@"download1 --- %@", [NSThread currentThread]);
    }];
    [queue addOperationWithBlock:^{
        NSLog(@"download2 --- %@", [NSThread currentThread]);
    }];
}

- (void)operationQueue1
{
    // 创建队列
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    
    // 创建操作（任务）
    // 创建NSInvocationOperation
    NSInvocationOperation *op1 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(download1) object:nil];
    NSInvocationOperation *op2 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(download2) object:nil];
    
    // 创建NSBlockOperation
    NSBlockOperation *op3 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"download3 --- %@", [NSThread currentThread]);
    }];
    
    [op3 addExecutionBlock:^{
        NSLog(@"download4 --- %@", [NSThread currentThread]);
    }];
    [op3 addExecutionBlock:^{
        NSLog(@"download5 --- %@", [NSThread currentThread]);
    }];
    
    
    NSBlockOperation *op4 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"download6 --- %@", [NSThread currentThread]);
    }];
    
    // 创建XMGOperation
    XMGOperation *op5 = [[XMGOperation alloc] init];
    
    // 添加任务到队列中
    [queue addOperation:op1]; // [op1 start]
    [queue addOperation:op2]; // [op2 start]
    [queue addOperation:op3]; // [op3 start]
    [queue addOperation:op4]; // [op4 start]
    [queue addOperation:op5]; // [op5 start]
}

- (void)download1
{
    NSLog(@"download1 --- %@", [NSThread currentThread]);
}

- (void)download2
{
    NSLog(@"download2 --- %@", [NSThread currentThread]);
}
@end

04-掌握-操作依赖

//
//  ViewController.m
//  04-掌握-操作依赖
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

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

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    
    NSBlockOperation *op1 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"download1----%@", [NSThread  currentThread]);
    }];
    NSBlockOperation *op2 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"download2----%@", [NSThread  currentThread]);
    }];
    NSBlockOperation *op3 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"download3----%@", [NSThread  currentThread]);
    }];
    NSBlockOperation *op4 = [NSBlockOperation blockOperationWithBlock:^{
        for (NSInteger i = 0; i<10; i++) {
            NSLog(@"download4----%@", [NSThread  currentThread]);
        }
    }];
    NSBlockOperation *op5 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"download5----%@", [NSThread  currentThread]);
    }];
    op5.completionBlock = ^{
        NSLog(@"op5执行完毕---%@", [NSThread currentThread]);
    };
    
   // 设置依赖
    [op3 addDependency:op1];
    [op3 addDependency:op2];
    [op3 addDependency:op4];
    
    [queue addOperation:op1];
    [queue addOperation:op2];
    [queue addOperation:op3];
    [queue addOperation:op4];
    [queue addOperation:op5];
}

@end

05-掌握-线程间的通信

//  ViewController.m
//  05-掌握-线程间的通信
#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

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

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    NSOperationQueue *queue = [[NSOperationQueue alloc] init];
    
    __block UIImage *image1 = nil;
    // 下载图片1
    NSBlockOperation *download1 = [NSBlockOperation blockOperationWithBlock:^{
        
        // 图片的网络路径
        NSURL *url = [NSURL URLWithString:@"http://img.pconline.com.cn/images/photoblog/9/9/8/1/9981681/200910/11/1255259355826.jpg"];
        
        // 加载图片
        NSData *data = [NSData dataWithContentsOfURL:url];
        
        // 生成图片
        image1 = [UIImage imageWithData:data];
    }];
    
    __block UIImage *image2 = nil;
    // 下载图片2
    NSBlockOperation *download2 = [NSBlockOperation blockOperationWithBlock:^{
        
        // 图片的网络路径
        NSURL *url = [NSURL URLWithString:@"http://pic38.nipic.com/20140228/5571398_215900721128_2.jpg"];

        
        // 加载图片
        NSData *data = [NSData dataWithContentsOfURL:url];
        
        // 生成图片
        image2 = [UIImage imageWithData:data];
    }];
    
    // 合成图片
    NSBlockOperation *combine = [NSBlockOperation blockOperationWithBlock:^{
        // 开启新的图形上下文
        UIGraphicsBeginImageContext(CGSizeMake(100, 100));
        
        // 绘制图片
        [image1 drawInRect:CGRectMake(0, 0, 50, 100)];
        image1 = nil;
        
        [image2 drawInRect:CGRectMake(50, 0, 50, 100)];
        image2 = nil;
        
        // 取得上下文中的图片
        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
        
        // 结束上下文
        UIGraphicsEndImageContext();
        
        // 回到主线程
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            self.imageView.image = image;
        }];
    }];
    [combine addDependency:download1];
    [combine addDependency:download2];
    设置完依赖在放到队列中
    [queue addOperation:download1];
    [queue addOperation:download2];
    [queue addOperation:combine];
}

/**
 * 线程之间的通信
 */
- (void)test
{
    [[[NSOperationQueue alloc] init] addOperationWithBlock:^{
        // 图片的网络路径
       NSURL *url = [NSURL URLWithString:@"http://img.pconline.com.cn/images/photoblog/9/9/8/1/9981681/200910/11/1255259355826.jpg"];
     
        
        // 加载图片
        NSData *data = [NSData dataWithContentsOfURL:url];
        
        // 生成图片
        UIImage *image = [UIImage imageWithData:data];
        
        // 回到主线程
        [[NSOperationQueue mainQueue] addOperationWithBlock:^{
            self.imageView.image = image;
        }];
    }];
}

@end