iOS 多线程实例（自定义NSOperation并传值（block，notification））

来源：互联网发布：莆田系知乎编辑：程序博客网时间：2024/06/14 20:39

#import <Foundation/Foundation.h>

#import <UIKit/UIKit.h>

@protocol DownLoadOperationDelegate <NSObject>

- (void)sendImage:(UIImage *)image;

@end

@interface DownLoadOperation : NSOperation

{

NSString *urlString;

}

//@property (nonatomic,copy)void(^finish)(UIImage *image);

@property (nonatomic)id<DownLoadOperationDelegate>delegate;

//下载图片的operation需要url

- (instancetype)initWithDownLoadMessageURL:(NSString *)url;

@end

#import "DownLoadOperation.h"

@implementation DownLoadOperation

//Operationde具体操作写在main 里面 startde 时候会执行里面的操作

- (instancetype)initWithDownLoadMessageURL:(NSString *)url

{

self = [super init];

if (self) {

urlString = url;

}

return self;

}

- (void)main

{

NSLog(@".......");

// 具体下载的操作

NSURL *url = [NSURL URLWithString:urlString];

NSURLRequest *request = [NSURLRequest requestWithURL:url];

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

UIImage *image = [UIImage imageWithData:data];

NSLog(@"%@",image);

[self.delegate sendImage:image];

// [[NSNotificationCenter defaultCenter]postNotificationName:@"下载完成" object:image];

// self.imageBlock(image);

}

@end

#import "ViewController.h"

#import "DownLoadOperation.h"

@interface ViewController ()<DownLoadOperationDelegate>

{

UIImageView *imageView;

}

@end

@implementation ViewController

- (void)viewDidLoad {

[super viewDidLoad];

// [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(listenNot:) name:@"下载完成" object:nil];

imageView = [[UIImageView alloc]initWithFrame:self.view.frame];

[self.view addSubview:imageView];

DownLoadOperation *downLoad = [[DownLoadOperation alloc]initWithDownLoadMessageURL:@"http://www.huabian.com/uploadfile/2014/1118/20141118042246536.jpg"];

downLoad.delegate = self;

// downLoad.imageBlock = ^(UIImage *image){imageView.image = image;};

// [downLoad start];

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

queue.maxConcurrentOperationCount = 1;

[queue addOperation:downLoad];

}

- (void)sendImage:(UIImage *)image

{

imageView.image = image;

}

//- (void)listenNot:(NSNotification *)sender

//{

// NSLog(@"%@",sender);

//// imageView.image = sender.object;

//}

- (void)didReceiveMemoryWarning {

[super didReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

@end

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