多线程 NSOperation

//
// ViewController.m
// NSOperation
//
// Created by dc008 on 15/12/24.
// Copyright © 2015年 崔晓宇. All rights reserved.
//
#define ROW 5
#define COLUMN 3
#define IMAGE_COUNT ROW*COLUMN
#define WIDTH 100 //图片宽
#define HEIGHT WIDTH //图片高
#import "ViewController.h"

@interface ViewController ()
{
NSMutableArray *_imageViews;
NSArray *array;
}
@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
[self layout];
array = @[@"http://pic12.nipic.com/20110121/3556745_181933155140_2.jpg",
@"http://pic31.nipic.com/20130722/12196046_160624534194_2.jpg",
@"http://pic4.nipic.com/20091118/3047572_163336087407_2.jpg",
@"http://pic.nipic.com/2008-05-29/200852973848511_2.jpg",
@"http://pic41.nipic.com/20140504/18401726_095421197182_2.jpg",
@"http://pic51.nipic.com/file/20141024/13035204_155709166956_2.jpg",
@"http://pic36.nipic.com/20131125/8821914_113934565000_2.jpg",
@"http://pic31.nipic.com/20130722/12196046_160637651196_2.jpg",
@"http://pic28.nipic.com/20130412/3718408_231850588113_2.jpg",
@"http://pica.nipic.com/2007-06-06/20076615744388_2.jpg",
@"http://pic23.nipic.com/20120901/8737320_222046006000_2.jpg",
@"http://pic12.nipic.com/20110119/3556745_180736335138_2.jpg",
@"http://pic27.nipic.com/20130226/6806713_165327321179_2.jpg",
@"http://pic18.nipic.com/20111202/8920105_164704212146_2.jpg",
@"http://img.taopic.com/uploads/allimg/110914/8879-11091423505866.jpg"
];
}

- (void)layout{
_imageViews = [NSMutableArray array];
for (int r = 0; r < COLUMN; r++) {
for (int c = 0; c < ROW; c++) {
UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(18.75 + r *118.75, 20+ c *118.75,WIDTH , HEIGHT)];
imageView.backgroundColor = [UIColor orangeColor];
[self.view addSubview:imageView];
[_imageViews addObject:imageView];
}

}
//添加按钮
UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
button.frame = CGRectMake(50, 600, 275, 30);
[button setTitle:@"加载图片" forState:UIControlStateNormal];
[button addTarget:self action:@selector(useMultiThread) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}

- (void)loadImage : (NSNumber *)index {

NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://pic31.nipic.com/20130722/12196046_160624534194_2.jpg"]]];

//更新UI界面,调用主线程队列
[[NSOperationQueue mainQueue]addOperationWithBlock:^{
[self updateImage:@[data,index]];
}];
}

- (void)updateImage : (NSArray *)arr{
UIImage *image = [UIImage imageWithData:arr[0]];
UIImageView *imageView = _imageViews[[arr[1]intValue] ];
imageView.image = image;
}

- (void)useMultiThread{
//1.创建一个操作队列
NSOperationQueue *operationQueue = [[NSOperationQueue alloc]init];
operationQueue.maxConcurrentOperationCount = 5;//设置最大并发线程数
//2.向队列添加操作
// for (int i= 0 ; i<IMAGE_COUNT; i++) {
//方法1.创建操作块,添加到队列
// NSBlockOperation *blockOperation = [NSBlockOperation blockOperationWithBlock:^{
// [self loadImage : [NSNumber numberWithInt:i]];
//
// }];
// [operationQueue addOperation:blockOperation];
//
//方法2.祷文invocation
// NSInvocationOperation *invocationOperation = [[NSInvocationOperation alloc]initWithTarget:self selector:@selector(loadImage:) object:[NSNumber numberWithInt:i]];
// [operationQueue addOperation:invocationOperation];

//方法3.控制线程的执行顺序
NSBlockOperation *lastOperation = [NSBlockOperation blockOperationWithBlock:^{
[self loadImage:@(IMAGE_COUNT-1)];
}];
for (int j = 0; j<IMAGE_COUNT-1; j++) {
NSBlockOperation *normalOp = [NSBlockOperation blockOperationWithBlock:^{
[self loadImage:[NSNumber numberWithInt:j]];
}];
//设置依赖操作(普通依赖最后)
[normalOp addDependency:lastOperation];
[operationQueue addOperation:normalOp];
}
[operationQueue addOperation:lastOperation];

//}

}

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

@end