效果如下：
ViewController.h
1 #import <UIKit/UIKit.h>2 3 @interface ViewController : UITableViewController4 @PRoperty (copy, nonatomic) NSArray *arrSampleName;5 6 - (instancetype)initWithSampleNameArray:(NSArray *)arrSampleName;7 8 @end
ViewController.m
1 #import "ViewController.h" 2 #import "FirstSampleViewController.h" 3 #import "SecondSampleViewController.h" 4 5 @interface ViewController () 6 - (void)layoutUI; 7 @end 8 9 @implementation ViewController10 - (void)viewDidLoad {11 [super viewDidLoad];12 13 [self layoutUI];14 }15 16 - (void)didReceiveMemoryWarning {17 [super didReceiveMemoryWarning];18 // Dispose of any resources that can be recreated.19 }20 21 - (instancetype)initWithSampleNameArray:(NSArray *)arrSampleName {22 if (self = [super initWithStyle:UITableViewStyleGrouped]) {23 self.navigationItem.title = @"多線程開發之二 NSOperation";24 self.navigationItem.backBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"返回首頁" style:UIBarButtonItemStylePlain target:nil action:nil];25 26 _arrSampleName = arrSampleName;27 }28 return self;29 }30 31 - (void)layoutUI {32 }33 34 #pragma mark - UITableViewController相關方法重寫35 - (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {36 return 0.1;37 }38 39 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {40 return 1;41 }42 43 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {44 return [_arrSampleName count];45 }46 47 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {48 static NSString *cellIdentifier = @"cell";49 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];50 if (!cell) {51 cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];52 }53 cell.textLabel.text = _arrSampleName[indexPath.row];54 return cell;55 }56 57 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {58 switch (indexPath.row) {59 case 0: {60 FirstSampleViewController *firstSampleVC = [FirstSampleViewController new];61 [self.navigationController pushViewController:firstSampleVC animated:YES];62 break;63 }64 case 1: {65 SecondSampleViewController *secondSampleVC = [SecondSampleViewController new];66 [self.navigationController pushViewController:secondSampleVC animated:YES];67 break;68 }69 default:70 break;71 }72 }73 74 @end
UIImage+RescaleImage.h
1 #import <UIKit/UIKit.h> 2 3 @interface UIImage (RescaleImage) 4 /** 5 * 根據寬高大小，獲取對應的縮放圖片 6 * 7 * @param size 寬高大小 8 * 9 * @return 對應的縮放圖片10 */11 - (UIImage *)rescaleImageToSize:(CGSize)size;12 13 @end
UIImage+RescaleImage.m
1 #import "UIImage+RescaleImage.h" 2 3 @implementation UIImage (RescaleImage) 4 5 - (UIImage *)rescaleImageToSize:(CGSize)size { 6 CGRect rect = CGRectMake(0.0, 0.0, size.width, size.height); 7 8 UIGraphicsBeginImageContext(rect.size); 9 [self drawInRect:rect];10 UIImage *imgScale = UIGraphicsGetImageFromCurrentImageContext();11 UIGraphicsEndImageContext();12 13 return imgScale;14 }15 16 @end
Common.h
1 #import <Foundation/Foundation.h>2 3 @interface Common : NSObject4 + (NSURL *)randomImageURL;5 6 @end
Common.m
1 #import "Common.h" 2 3 @implementation Common 4 5 + (NSURL *)randomImageURL { 6 NSUInteger randomVal = (arc4random() % 20) + 1; //1-20的隨機數 7 NSString *randomValStr = [NSString stringWithFormat:@"%lu", (unsigned long)randomVal]; 8 if (randomVal < 10) { 9 randomValStr = [@"0" stringByAppendingString:randomValStr];10 }11 12 NSString *imageURLStr = [NSString stringWithFormat:@"http://images.apple.com/v/watch/e/apple-watch/images/collection_%@_large.jpg", randomValStr];13 return [NSURL URLWithString:imageURLStr];14 }15 16 @end
FirstSampleViewController.h
1 #import <UIKit/UIKit.h>2 3 @interface FirstSampleViewController : UIViewController4 @property (assign, nonatomic) CGSize rescaleImageSize;5 6 @property (strong, nonatomic) IBOutlet UIImageView *imgV;7 @property (strong, nonatomic) IBOutlet UIButton *btnLoadImage;8 9 @end
FirstSampleViewController.m
1 #import "FirstSampleViewController.h" 2 #import "UIImage+RescaleImage.h" 3 #import "Common.h" 4 5 @interface FirstSampleViewController () 6 - (void)layoutUI; 7 - (void)updateImage:(NSData *)imageData; 8 - (void)loadImageFromNetwork; 9 @end10 11 @implementation FirstSampleViewController12 13 - (void)viewDidLoad {14 [super viewDidLoad];15 16 [self layoutUI];17 }18 19 - (void)didReceiveMemoryWarning {20 [super didReceiveMemoryWarning];21 // Dispose of any resources that can be recreated.22 }23 24 - (void)dealloc {25 _imgV.image = nil;26 }27 28 - (void)layoutUI {29 CGFloat width = [[UIScreen mainScreen] bounds].size.width; //bounds 返回整個屏幕大??；applicationFrame 返回去除狀態欄后的屏幕大小30 CGFloat height = width * 438.0 / 366.0;31 const CGFloat percentVal = 3.0 / 4.0; //以屏幕寬度的3/4比例顯示32 _rescaleImageSize = CGSizeMake(width * percentVal, height * percentVal);33 34 //NSString *path = [[NSBundle mainBundle] pathForResource:@"PictureNo@2x" ofType:@"png"];35 //_imgV.image = [UIImage imageWithContentsOfFile:path];36 37 _btnLoadImage.tintColor = [UIColor darkGrayColor];38 _btnLoadImage.layer.masksToBounds = YES;39 _btnLoadImage.layer.cornerRadius = 10.0;40 _btnLoadImage.layer.borderColor = [UIColor grayColor].CGColor;41 _btnLoadImage.layer.borderWidth = 1.0;42 }43 44 - (void)updateImage:(NSData *)imageData {45 UIImage *img = [UIImage imageWithData:imageData];46 _imgV.image = [img rescaleImageToSize:_rescaleImageSize];47 }48 49 - (void)loadImageFromNetwork {50 NSURL *url = [Common randomImageURL];51 NSData *data = [NSData dataWithContentsOfURL:url];52 53 //mainQueue 是 UI 主線程，調用主線程隊列的方法進行操作54 [[NSOperationQueue mainQueue] addOperationWithBlock:^{55 [self updateImage:data];56 }];57 }58 59 - (IBAction)loadImage:(id)sender {60 //方法一：使用 NSInvocationOperation61 // NSInvocationOperation *invocationOperation = [[NSInvocationOperation alloc]62 // initWithTarget:self63 // selector:@selector(loadImageFromNetwork)64 // object:nil];65 // NSOperationQueue *operationQueue = [NSOperationQueue new]; //操作隊列66 // [operationQueue addOperation:invocationOperation];67 68 69 //方法二：使用 NSBlockOperation70 NSBlockOperation *blockOperation = [NSBlockOperation blockOperationWithBlock:^{71 [self loadImageFromNetwork];72 }];73 [blockOperation addExecutionBlock:^{ //還可以為 blockOperation 添加代碼塊；多個代碼塊會被分到多個線程去執行，存在兩個代碼塊被分配到同一個線程執行的情況74 NSLog(@"代碼塊");75 }];76 [blockOperation addExecutionBlock:[blockOperation executionBlocks][1]]; //這里可以調用他的 executionBlocks 獲取到添加的代碼塊數組；上面打印的內容「代碼塊」會被執行兩次77 78 [blockOperation setCompletionBlock:^{79 NSLog(@"所有代碼塊操作執行完畢后（無論已取消還是已完成），做一些事情，只執行一次");80 }];81 82 //[blockOperation start]; //使用 start 方法，則此操作在主線程中執行；一般不這樣操作，而是添加到操作隊列中83 NSOperationQueue *operationQueue = [NSOperationQueue new]; //操作隊列84 [operationQueue addOperation:blockOperation]; //添加到操作隊列，這時隊列會開啟一個線程去執行此操作；一個線程可以執行多個操作85 86 //方法三：直接使用 NSOperationQueue87 // NSOperationQueue *operationQueue = [NSOperationQueue new]; //操作隊列88 // [operationQueue addOperationWithBlock:^{89 // [self loadImageFromNetwork];90 // }];91 }92 93 @end
FirstSampleViewController.xib
1 <?xml version="1.0" encoding="UTF-8" standalone="no"?> 2 <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="7706" systemVersion="14E46" targetRuntime="iOS.CocoaTouch" propertyaccessControl="none" useAutolayout="YES" useTraitCollections="YES"> 3 <dependencies> 4 <deployment identifier="iOS"/> 5 <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7703"/> 6 </dependencies> 7 <objects> 8 <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="FirstSampleViewController"> 9 <connections>10 <outlet property="btnLoadImage" destination="sLs-f1-Gzc" id="kX8-J0-v0V"/>11 <outlet property="imgV" destination="4Qp-uk-KAb" id="RM3-Ha-glh"/>12 <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>13 </connections>14 </placeholder>15 <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>16 <view clearsContextBeforeDrawing="NO" contentMode="scaleToFill" id="i5M-Pr-FkT">17 <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>18 <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>19 <subviews>20 <imageView userInteractionEnabled="NO" contentMode="scaleToFill" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="PictureNo.png" translatesAutoresizingMaskIntoConstraints="NO" id="4Qp-uk-KAb">21 <rect key="frame" x="205" y="225" width="190" height="150"/>22 <constraints>23 <constraint firstAttribute="height" constant="150" id="S/>24 <constraint firstAttribute="height" constant="150" id="VwM-i1-atB"/>25 <constraint firstAttribute="width" constant="190" id="mUh-Bu-tUd"/>26 <constraint firstAttribute="width" constant="190" id="mdJ-1c-QFa"/>27 <constraint firstAttribute="width" constant="190" id="sVS-bU-Ty9"/>28 <constraint firstAttribute="height" constant="150" id="uMG-oN-J56"/>29 <constraint firstAttribute="height" constant="150" id="vws-Qw-UrB"/>30 </constraints>31 <variation key="default">32 <mask key="constraints">33 <exclude reference="SIp-Wd-idU"/>34 <exclude reference="VwM-i1-atB"/>35 <exclude reference="mUh-Bu-tUd"/>36 <exclude reference="mdJ-1c-QFa"/>37 <exclude reference="sVS-bU-Ty9"/>38 <exclude reference="uMG-oN-J56"/>39 <exclude reference="vws-Qw-UrB"/>40 </mask>41 </variation>42 </imageView>43 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="sLs-f1-Gzc">44 <rect key="frame" x="230" y="500" width="140" height="50"/>45 <constraints>46 <constraint firstAttribute="width" constant="140" id="1jv-9K-mdH"/>47 <constraint firstAttribute="height" constant="50" id="Q2w-vR-9ac"/>48 </constraints>49 <state key="normal" title="加載網絡圖片">50 <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>51 </state>52 <connections>53 <action selector="loadImage:" destination="-1" eventType="touchUpInside" id="fdy-Ln-5oS"/>54 </connections>55 </button>56 </subviews>57 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>58 <constraints>59 <constraint firstItem="4Qp-uk-KAb" firstAttribute="leading" secondItem="i5M-Pr-FkT" secondAttribute="leading" constant="205" id="2a2-mS-WFa"/>60 <constraint firstItem="sLs-f1-Gzc" firstAttribute="top" secondItem="i5M-Pr-FkT" secondAttribute="top" id="ES4-wl-RBz"/>61 <constraint firstItem="4Qp-uk-KAb" firstAttribute="centerY" secondItem="i5M-Pr-FkT" secondAttribute="centerY" id="MUJ-WA-sUf"/>62 <constraint firstItem="4Qp-uk-KAb" firstAttribute="centerX" secondItem="sLs-f1-Gzc" secondAttribute="centerX" id="Q8a-1k-DzJ"/>63 <constraint firstAttribute="bottom" secondItem="4Qp-uk-KAb" secondAttribute="bottom" constant="71" id="V0a-9y-Dwa"/>64 <constraint firstAttribute="bottom" secondItem="sLs-f1-Gzc" secondAttribute="bottom" constant="50" id="VMG-CV-eeq"/>65 <constraint firstItem="4Qp-uk-KAb" firstAttribute="top" secondItem="i5M-Pr-FkT" secondAttribute="top" constant="-71" id="gqW-Wq-4Zv"/>66 <constraint firstItem="sLs-f1-Gzc" firstAttribute="centerX" secondItem="i5M-Pr-FkT" secondAttribute="centerX" id="kNf-6d-EJ8"/>67 </constraints>68 <variation key="default">69 <mask key="constraints">70 <exclude reference="2a2-mS-WFa"/>71 <exclude reference="V0a-9y-Dwa"/>72 <exclude reference="gqW-Wq-4Zv"/>73 <exclude reference="ES4-wl-RBz"/>74 </mask>75 </variation>76 </view>77 </objects>78 <resources>79 <image name="PictureNo.png" width="190" height="150"/>80 </resources>81 </document>
SecondSampleViewController.h
1 #import <UIKit/UIKit.h>2 3 @interface SecondSampleViewController : UIViewController4 @property (assign, nonatomic) CGSize rescaleImageSize;5 @property (strong, nonatomic) NSMutableArray *mArrImageView;6 7 @property (strong, nonatomic) IBOutlet UIButton *btnLoadImage;8 9 @end
SecondSampleViewController.m
1 #import "SecondSampleViewController.h" 2 #import "UIImage+RescaleImage.h" 3 #import "Common.h" 4 5 #define kRowCount 4 6 #define kColumnCount 3 7 #define kCellSpacing 10.0 8 9 @interface SecondSampleViewController () 10 - (void)layoutUI; 11 - (void)updateImage:(NSData *)imageData withImageIndex:(NSInteger)imageIndex; 12 -(NSData *)requestData:(NSInteger)imageIndex; 13 - (void)loadImageFromNetwork:(NSInteger)imageIndex; 14 @end 15 16 @implementation SecondSampleViewController 17 18 - (void)viewDidLoad { 19 [super viewDidLoad]; 20 21 [self layoutUI]; 22 } 23 24 - (void)didReceiveMemoryWarning { 25 [super didReceiveMemoryWarning]; 26 // Dispose of any resources that can be recreated. 27 } 28 29 - (void)dealloc { 30 _mArrImageView = nil; 31 } 32 33 - (void)layoutUI { 34 CGFloat width = ([[UIScreen mainScreen] bounds].size.width - ((kColumnCount + 1) * kCellSpacing)) / kColumnCount; 35 _rescaleImageSize = CGSizeMake(width, width); 36 37 CGFloat heightOfStatusAndNav = 20.0 + 44.0; 38 NSString *path = [[NSBundle mainBundle] pathForResource:@"PictureNo@2x" ofType:@"png"]; 39 UIImage *img = [UIImage imageWithContentsOfFile:path]; 40 _mArrImageView = [NSMutableArray arrayWithCapacity:kRowCount * kColumnCount]; 41 //初始化多個圖片視圖 42 for (NSUInteger i=0; i<kRowCount; i++) { 43 for (NSUInteger j=0; j<kColumnCount; j++) { 44 UIImageView *imgV = [[UIImageView alloc] initWithFrame: 45 CGRectMake(_rescaleImageSize.width * j + kCellSpacing * (j+1), 46 _rescaleImageSize.height * i + kCellSpacing * (i+1) + heightOfStatusAndNav, 47 _rescaleImageSize.width, 48 _rescaleImageSize.height)]; 49 imgV.image = img; 50 [self.view addSubview:imgV]; 51 [_mArrImageView addObject:imgV]; 52 } 53 } 54 55 _btnLoadImage.tintColor = [UIColor darkGrayColor]; 56 _btnLoadImage.layer.masksToBounds = YES; 57 _btnLoadImage.layer.cornerRadius = 10.0; 58 _btnLoadImage.layer.borderColor = [UIColor grayColor].CGColor; 59 _btnLoadImage.layer.borderWidth = 1.0; 60 } 61 62 - (void)updateImage:(NSData *)imageData withImageIndex:(NSInteger)imageIndex { 63 UIImage *img = [UIImage imageWithData:imageData]; 64 UIImageView *imgVCurrent = _mArrImageView[imageIndex]; 65 imgVCurrent.image = [img rescaleImageToSize:_rescaleImageSize]; 66 } 67 68 -(NSData *)requestData:(NSInteger)imageIndex { 69 //對于多線程操作，建議把線程操作放到 @autoreleasepool 中 70 @autoreleasepool { 71 NSURL *url = [Common randomImageURL]; 72 NSData *data = [NSData dataWithContentsOfURL:url]; 73 return data; 74 } 75 } 76 77 - (void)loadImageFromNetwork:(NSInteger)imageIndex { 78 /* 79 對比之前 NSThread 加載圖片，你會發現核心代碼簡化了不少，有兩點值得提的： 80 （1）使用 NSBlockOperation 方法，所有的操作不必單獨定義方法，同時解決了只能傳遞一個參數的問題。類似的操作，例如：調用主線程隊列的 addOperationWithBlock: 方法進行 UI 更新，不用再定義一個參數實體類來進行參數傳遞（之前必須定義一個 KMImageData 解決只能傳遞一個參數的問題）。 81 （2）使用 NSOperation 進行多線程開發可以設置最大并發操作數，有效的對操作進行控制（如 Demo 的代碼設置最大并發操作數為5，則圖片最多是五個一次加載的）。 82 */ 83 NSLog(@"Current thread:%@", [NSThread currentThread]); 84 85 //mainQueue 是 UI 主線程，調用主線程隊列的方法進行操作 86 [[NSOperationQueue mainQueue] addOperationWithBlock:^{ 87 [self updateImage:[self requestData:imageIndex] withImageIndex:imageIndex]; 88 }]; 89 } 90 91 - (IBAction)loadImage:(id)sender { 92 NSOperationQueue *operationQueue = [NSOperationQueue new]; 93 operationQueue.maxConcurrentOperationCount = 5; //設置最大并發操作數 94 95 NSUInteger len = kRowCount * kColumnCount; 96 NSBlockOperation *lastBlockOperation = [NSBlockOperation blockOperationWithBlock:^{ 97 [self loadImageFromNetwork:len - 1]; 98 }]; 99 100 for (NSUInteger i=0; i<len - 1; i++) {101 NSBlockOperation *blockOperation = [NSBlockOperation blockOperationWithBlock:^{102 [self loadImageFromNetwork:i];103 }];104 105 //實現控制「操作執行順序」，例如：控制最后一個操作第一個執行，這里設置操作的依賴關系為：最后一張圖片加載操作完成后才執行106 //PS：注意請勿進行循環依賴，否則循環依賴相關的操作是不會被執行的107 //這里添加依賴關系；其相對應的移除方法：- (void)removeDependency:(NSOperation *)op;108 [blockOperation addDependency:lastBlockOperation];109 110 //另外添加操作對象實例數組的方法：- (void)addOperations:(NSArray *)ops waitUntilFinished:(BOOL)wait;111 [operationQueue addOperation:blockOperation];112 }113 114 [operationQueue addOperation:lastBlockOperation];115 116 /*117 lastBlockOperation.queuePriority = NSOperationQueuePriorityVeryHigh; //在某個操作隊列中的隊列優先級；這樣可以提高他被優先加載的機率，但是他也未必就第一個加載；所以要實現控制「操作執行順序」，就得用設置操作的依賴關系的方式118 119 typedef enum : NSInteger {120 NSOperationQueuePriorityVeryLow = -8,121 NSOperationQueuePriorityLow = -4,122 NSOperationQueuePriorityNormal = 0,123 NSOperationQueuePriorityHigh = 4,124 NSOperationQueuePriorityVeryHigh = 8125 } NSOperationQueuePriority;126 */127 }128 129 @end
SecondSampleViewController.xib
1 <?xml version="1.0" encoding="UTF-8" standalone="no"?> 2 <document type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="3.0" toolsVersion="7706" systemVersion="14E46" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES"> 3 <dependencies> 4 <deployment identifier="iOS"/> 5 <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="7703"/> 6 </dependencies> 7 <objects> 8 <placeholder placeholderIdentifier="IBFilesOwner" id="-1" userLabel="File's Owner" customClass="SecondSampleViewController"> 9 <connections>10 <outlet property="btnLoadImage" destination="F5h-ZI-gGL" id="I40-e2-bAa"/>11 <outlet property="view" destination="i5M-Pr-FkT" id="sfx-zR-JGt"/>12 </connections>13 </placeholder>14 <placeholder placeholderIdentifier="IBFirstResponder" id="-2" customClass="UIResponder"/>15 <view clearsContextBeforeDrawing="NO" contentMode="scaleToFill" id="i5M-Pr-FkT">16 <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>17 <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>18 <subviews>19 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="F5h-ZI-gGL">20 <rect key="frame" x="230" y="530" width="140" height="50"/>21 <constraints>22 <constraint firstAttribute="height" constant="50" id="HWd-Xc-Wk7"/>23 <constraint firstAttribute="width" constant="140" id="vrH-qE-PNK"/>24 </constraints>25 <state key="normal" title="加載網絡圖片">26 <color key="titleShadowColor" white="0.5" alpha="1" colorSpace="calibratedWhite"/>27 </state>28 <connections>29 <action selector="loadImage:" destination="-1" eventType="touchUpInside" id="Hgw-q8-lHy"/>30 </connections>31 </button>32 </subviews>33 <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>34 <constraints>35 <constraint firstAttribute="bottom" secondItem="F5h-ZI-gGL" secondAttribute="bottom" constant="20" id="jPY-fY-9XJ"/>36 <constraint firstAttribute="centerX" secondItem="F5h-ZI-gGL" secondAttribute="centerX" id="rH1-sV-pST"/>37 </constraints>38 </view>39 </objects>40 </document>
AppDelegate.h
1 #import <UIKit/UIKit.h>2 3 @interface AppDelegate : UIResponder <UIApplicationDelegate>4 5 @property (strong, nonatomic) UIWindow *window;6 @property (strong, nonatomic) UINavigationController *navigationController;7 8 @end
AppDelegate.m
1 #import "AppDelegate.h" 2 #import "ViewController.h" 3 4 @interface AppDelegate () 5 6 @end 7 8 @implementation AppDelegate 9 10 11 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {12 _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];13 ViewController *viewController = [[ViewController alloc] initWithSampleNameArray:@[@"請求單張網絡圖片（解決線程阻塞）", @"請求多張網絡圖片（多個線程并發）"]];14 _navigationController = [[UINavigationController alloc] initWithRootViewController:viewController];15 _window.rootViewController = _navigationController;16 //[_window addSubview:_navigationController.view]; //當_window.rootViewController關聯時，這一句可有可無17 [_window makeKeyAndVisible];18 return YES;19 }20 21 - (void)applicationWillResignActive:(UIApplication *)application {22 }23 24 - (void)applicationDidEnterBackground:(UIApplication *)application {25 }26 27 - (void)applicationWillEnterForeground:(UIApplication *)application {28 }29 30 - (void)applicationDidBecomeActive:(UIApplication *)application {31 }32 33 - (void)applicationWillTerminate:(UIApplication *)application {34 }35 36 @end
輸出結果：
1 2015-08-28 00:26:36.878 NSOperationDemo[4228:48976] 代碼塊 2 2015-08-28 00:26:36.878 NSOperationDemo[4228:48977] 代碼塊 3 2015-08-28 00:26:37.366 NSOperationDemo[4228:48976] 所有代碼塊操作執行完畢后（無論已取消還是已完成），做一些事情，只執行一次 4 5 2015-08-28 00:26:42.505 NSOperationDemo[4228:48860] Current thread:<NSThread: 0x7fbd1bd335b0>{number = 3, name = (null)} 6 2015-08-28 00:26:42.506 NSOperationDemo[4228:48978] Current thread:<NSThread: 0x7fbd1be0ad90>{number = 4, name = (null)} 7 2015-08-28 00:26:42.507 NSOperationDemo[4228:48990] Current thread:<NSThread: 0x7fbd1e047390>{number = 5, name = (null)} 8 2015-08-28 00:26:42.507 NSOperationDemo[4228:48990] Current thread:<NSThread: 0x7fbd1e047390>{number = 5, name = (null)} 9 2015-08-28 00:26:42.507 NSOperationDemo[4228:48978] Current thread:<NSThread: 0x7fbd1be0ad90>{number = 4, name = (null)}10 2015-08-28 00:26:42.507 NSOperationDemo[4228:49025] Current thread:<NSThread: 0x7fbd1be07c70>{number = 6, name = (null)}11 2015-08-28 00:26:42.508 NSOperationDemo[4228:48978] Current thread:<NSThread: 0x7fbd1be0ad90>{number = 4, name = (null)}12 2015-08-28 00:26:42.508 NSOperationDemo[4228:49025] Current thread:<NSThread: 0x7fbd1be07c70>{number = 6, name = (null)}13 2015-08-28 00:26:42.508 NSOperationDemo[4228:48978] Current thread:<NSThread: 0x7fbd1be0ad90>{number = 4, name = (null)}14 2015-08-28 00:26:42.508 NSOperationDemo[4228:48990] Current thread:<NSThread: 0x7fbd1e047390>{number = 5, name = (null)}15 2015-08-28 00:26:42.508 NSOperationDemo[4228:48976] Current thread:<NSThread: 0x7fbd1e0335f0>{number = 7, name = (null)}16 2015-08-28 00:26:42.508 NSOperationDemo[4228:48978] Current thread:<NSThread: 0x7fbd1be0ad90>{number = 4, name = (null)}
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