NSOperation

自定义operation

相比GCD,可以中断任务,也可使用 addDependency,对要执行的任务进行排序..

//
//  CustomOperation.h
//  Test
//
//  Created by M on 16/1/5.
//  Copyright © 2016年 Meng. All rights reserved.
//

#import <Foundation/Foundation.h>

@protocol CustomOperationDelegate <NSObject>

-(void)handleDelegate:(NSString*)str;

@end

@interface CustomOperation : NSOperation

@property(nonatomic,assign)id<CustomOperationDelegate> Delegate;
@property(nonatomic)BOOL IsStopOperation;

-(id)initWithOperationDelegate:(id<CustomOperationDelegate>) delegate;

@end

//
//  CustomOperation.m
//  Test
//
//  Created by M on 16/1/5.
//  Copyright © 2016年 Meng. All rights reserved.
//

#import "CustomOperation.h"

@implementation CustomOperation

-(id)initWithOperationDelegate:(id<CustomOperationDelegate>)delegate
{

    if (self = [super init]) {

        self.Delegate = delegate;

    }

    return self;

}

-(void)main
{
    @autoreleasepool {

        if ([self.Delegate respondsToSelector:@selector(handleDelegate:)]) {

            for (int i =  ; i<; i++) {

                //中断operation
                if (self.IsStopOperation) {
                    return;
                }

                sleep();

                [self.Delegate performSelector:@selector(handleDelegate:) withObject:[NSString stringWithFormat:@"CustomOperation,%d",i]];

            }
        }

    }
}

@end

ViewController实现

//
//  ViewController.m
//  Test
//
//  Created by M on 16/1/4.
//  Copyright © 2016年 Meng. All rights reserved.
//

#import "ViewController.h"
#import "CustomOperation.h"

@interface ViewController ()<CustomOperationDelegate>//实现委托
{
    CustomOperation *CO;
    UILabel *CountLbl;
}

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    [self setupView];

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

    CO = [[CustomOperation alloc] initWithOperationDelegate:self];

    [qu addOperation:CO];//添加到Queue

#pragma mark =======================

    NSBlockOperation *BKO1 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"BKO1,%@", [NSThread currentThread]);

        for (int i = ; i<; i++) {
            NSLog(@"111111:%d",i);
            sleep();
        }
    }];

    NSBlockOperation *BKO2 = [NSBlockOperation blockOperationWithBlock:^{
        NSLog(@"BKO2,%@", [NSThread currentThread]);

        for (int i = ; i<; i++) {
            NSLog(@"222222:%d",i);
            sleep();
        }
    }];

    // BKO2 依赖 BKO1
    [BKO2 addDependency:BKO1];

    [qu addOperation:BKO1];
    [qu addOperation:BKO2];

#pragma mark =======================

    NSOperationQueue *qu2 = [[NSOperationQueue alloc] init];
    //把任务队列的最大并发数设置为1,也可以进行执行的排序....只不过是否有其他问题,还请指教.
    qu2.maxConcurrentOperationCount = ;

    for (int i = ; i < ; i ++) {

        [qu2 addOperation:[NSBlockOperation blockOperationWithBlock:^{
            sleep();
            NSLog(@"BKO:%d",i);
        }]];

    }

}

-(void)setupView
{

    CountLbl = [[UILabel alloc] initWithFrame:CGRectMake(self.view.bounds.size.width/, self.view.bounds.size.height/, self.view.bounds.size.width/, )];

    CountLbl.textAlignment = NSTextAlignmentCenter;

    [self.view addSubview:CountLbl];

    UIButton *stopBtn = [[UIButton alloc] initWithFrame:CGRectMake(self.view.bounds.size.width/, self.view.bounds.size.height/-, self.view.bounds.size.width/, )];

    stopBtn.backgroundColor = [UIColor darkGrayColor];

    [stopBtn setTitle:@"Stop" forState:UIControlStateNormal];

    [self.view addSubview:stopBtn];

    [stopBtn addTarget:self action:@selector(StopOperation) forControlEvents:UIControlEventTouchUpInside];

}

-(void)StopOperation
{

    CO.IsStopOperation = YES;
}
#pragma mark Delegate
-(void)handleDelegate:(NSString *)str
{
    //update the label text

    dispatch_async(dispatch_get_main_queue(), ^{
        CountLbl.text = str;
    });

}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end