多线程练习 -- 自定义NSOperation

LWTViewController.h

#import <UIKit/UIKit.h>

@interface LWTViewController : UITableViewController

@end

LWTViewController.m

//
//  LWTViewController.m
//  多线程练习 -- 自定义NSOperation
//
//  Created by apple on 14-6-25.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTViewController.h"
#import "LWTAppModel.h"
#import "LWTAppCell.h"
#import "LWTDownloadOperation.h"

@interface LWTViewController () <LWTDownloadOperationDelegate>

@property (nonatomic, strong) NSArray *apps;

@property (nonatomic, strong) NSOperationQueue *queue;

@property (nonatomic, strong) NSMutableDictionary *operations;

@property (nonatomic, strong) NSMutableDictionary *images;
@end

@implementation LWTViewController

- (NSArray *)apps
{
    if (_apps == nil) {
        NSString *path = [[NSBundle mainBundle] pathForResource:@"apps.plist" ofType:nil];
        NSArray *appArray = [NSArray arrayWithContentsOfFile:path];
        NSMutableArray *models = [NSMutableArray arrayWithCapacity:appArray.count];
        for (NSDictionary *dict in appArray) {
            LWTAppModel *app = [LWTAppModel appWithDict:dict];
            [models addObject:app];
        }
        _apps = [models copy];
    }
    return _apps;
}

- (NSOperationQueue *)queue
{
    if (_queue == nil) {
        _queue = [[NSOperationQueue alloc] init];
        _queue.maxConcurrentOperationCount = 2;
    }
    return _queue;
}

- (NSMutableDictionary *)operations
{
    if (_operations == nil) {
        _operations = [NSMutableDictionary dictionary];
    }
    return _operations;
}

- (NSMutableDictionary *)images
{
    if (_images == nil) {
        _images = [NSMutableDictionary dictionary];
    }
    return _images;
}

#pragma mark - 数据源方法

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return self.apps.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    LWTAppCell *cell = [LWTAppCell appCellWithTableView:tableView];
    
    LWTAppModel *app = self.apps[indexPath.row];
    
    UIImage *image = self.images[app.icon];
    if (image) {
        cell.image = image;
    }else{
        cell.image = [UIImage imageNamed:@"btn_icon_xihuan_normal"];
        
        if (!self.operations[app.icon]) {
            LWTDownloadOperation *operation = [[LWTDownloadOperation alloc] init];
            operation.indexPath = indexPath;
            operation.url = app.icon;
            operation.delegate = self;
            [self.queue addOperation:operation];
            self.operations[app.icon] = operation;
        }
    }
    
    cell.app = app;
    
    
    
    return cell;
}

#pragma mark - LWTDownloadOperationDelegate
- (void)downloadOperation:(LWTDownloadOperation *)downloadOperation DidFinishDownload:(UIImage *)image
{
    if (image) {
        
        self.images[downloadOperation.url] = image;
        [self.tableView reloadRowsAtIndexPaths:@[downloadOperation.indexPath] withRowAnimation:UITableViewRowAnimationNone];
    }
    
    [self.operations removeObjectForKey:downloadOperation.url];
}

- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
    [self.queue setSuspended:YES];
    NSLog(@"%d",self.queue.isSuspended);
}

- (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset
{
    [self.queue setSuspended:NO];
    NSLog(@"%d",self.queue.isSuspended);
}

@end

LWTAppModel.h

//
//  LWTAppModel.h
//  多线程练习 -- 自定义NSOperation
//
//  Created by apple on 14-6-25.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface LWTAppModel : NSObject

@property (nonatomic, copy) NSString *name;
@property (nonatomic, copy) NSString *icon;
@property (nonatomic, copy) NSString *download;


- (instancetype)initWithDict: (NSDictionary *)dict;
+ (instancetype)appWithDict : (NSDictionary *)dict;

@end

LWTAppModel.m

//
//  LWTAppModel.m
//  多线程练习 -- 自定义NSOperation
//
//  Created by apple on 14-6-25.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTAppModel.h"

@implementation LWTAppModel

- (instancetype)initWithDict:(NSDictionary *)dict
{
    self = [super init];
    if (self) {
        [self setValuesForKeysWithDictionary:dict];
    }
    return self;
}

+ (instancetype)appWithDict:(NSDictionary *)dict
{
    return [[self alloc] initWithDict:dict];
}

@end

LWTAppCell.h

//
//  LWTAppCell.h
//  多线程练习 -- 自定义NSOperation
//
//  Created by apple on 14-6-25.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import <UIKit/UIKit.h>
@class LWTAppModel;

@interface LWTAppCell : UITableViewCell

@property (nonatomic, strong) LWTAppModel *app;

@property (nonatomic, strong) UIImage *image;

+ (instancetype)appCellWithTableView : (UITableView *)tableView;

@end

LWTAppCell.m

//
//  LWTAppCell.m
//  多线程练习 -- 自定义NSOperation
//
//  Created by apple on 14-6-25.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTAppCell.h"
#import "LWTAppModel.h"

@implementation LWTAppCell



+ (instancetype)appCellWithTableView:(UITableView *)tableView
{
    NSString *ID = @"app";
    LWTAppCell *cell = [tableView dequeueReusableCellWithIdentifier:ID];
    if (cell == nil) {
        cell = [[LWTAppCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:ID];
    }
    return cell;
}

- (void)setApp:(LWTAppModel *)app
{
    _app =app;
    self.textLabel.text = _app.name;
    self.detailTextLabel.text = _app.download;
    self.imageView.image = self.image;
    
}

@end

LWTDownloadOperation.h

//
//  LWTDownloadOperation.h
//  多线程练习 -- 自定义NSOperation
//
//  Created by apple on 14-6-25.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import <Foundation/Foundation.h>
@class LWTDownloadOperation;

@protocol LWTDownloadOperationDelegate <NSObject>
@optional
- (void)downloadOperation:(LWTDownloadOperation *)downloadOperation DidFinishDownload : (UIImage *)image;

@end

@interface LWTDownloadOperation : NSOperation

@property (nonatomic, strong) NSString *url;
@property (nonatomic, strong) NSIndexPath *indexPath;

@property (nonatomic, weak) id<LWTDownloadOperationDelegate> delegate;

@end

LWTDownloadOperation.m

//
//  LWTDownloadOperation.m
//  多线程练习 -- 自定义NSOperation
//
//  Created by apple on 14-6-25.
//  Copyright (c) 2014年 lwt. All rights reserved.
//

#import "LWTDownloadOperation.h"

@implementation LWTDownloadOperation

- (void)main
{
    @autoreleasepool {
        NSLog(@"%@",[NSThread currentThread]);
        [NSThread sleepForTimeInterval:2.0];
        
        if (self.isCancelled) return;
        NSInteger interval = arc4random_uniform(8);
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(interval * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        
            NSURL *url = [NSURL URLWithString:self.url];
            NSData *data = [NSData dataWithContentsOfURL:url];
            if (self.isCancelled) return ;
            UIImage *image = [UIImage imageWithData:data];
            
            if (self.isCancelled) return;
            
            if ([self.delegate respondsToSelector:@selector(downloadOperation:DidFinishDownload:)]) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    [self.delegate downloadOperation:self DidFinishDownload:image];
                });
            }
            
        });
        
    }
}

@end

apps.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<array>
    <dict>
        <key>name</key>
        <string>植物大战僵尸</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/LuckyMidPressed@2x.png</string>
        <key>download</key>
        <string>10311万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>捕鱼达人2</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/userphoto_default_180.png</string>
        <key>download</key>
        <string>9982万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>保卫萝卜</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/icon_163.png</string>
        <key>download</key>
        <string>8582万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>找你妹</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/icon_kaixin.png</string>
        <key>download</key>
        <string>5910万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>水果忍者</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/icon_qq.png</string>
        <key>download</key>
        <string>5082万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>鳄鱼小顽皮</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/scene.png</string>
        <key>download</key>
        <string>3918万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>神偷奶爸</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/icon_sina.png</string>
        <key>download</key>
        <string>3681万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>时空猎人</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/icon_sohu.png</string>
        <key>download</key>
        <string>3645万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>愤怒的小鸟</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/me@2x.png</string>
        <key>download</key>
        <string>3552万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>滑雪大冒险</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/psb.png</string>
        <key>download</key>
        <string>3487万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>爸爸去哪儿</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/icon_renren.png</string>
        <key>download</key>
        <string>3117万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>我叫MT </string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/scene@2x.png</string>
        <key>download</key>
        <string>2386万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>3D终极狂飙</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/QQ20140413-4@2x.png</string>
        <key>download</key>
        <string>2166万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>杀手2</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/QQ20140413-5@2x.png</string>
        <key>download</key>
        <string>1951万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>俄罗斯方块</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/175792428160@2x.png</string>
        <key>download</key>
        <string>1290万</string>
    </dict>
    <dict>
        <key>name</key>
        <string>刀塔传奇</string>
        <key>icon</key>
        <string>file:///Users/apple/Desktop/173890450691@2x.png</string>
        <key>download</key>
        <string>1249万</string>
    </dict>
</array>
</plist>