多线程的简单使用

//
// ViewController.m
// 多线程处理
//
// Created by apple on 16/6/2.
// Copyright © 2016年 李重阳. All rights reserved.
//

#import "ViewController.h"

static NSInteger const AddTag = 100;

@interface ViewController ()

@property (nonatomic,strong) UIImageView * imageView;
@property (nonatomic,strong) NSArray * urlArr;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];


    self.urlArr = @[@"http://weixue.steptowin.com:8000/data/img/20160411/veuyytthy4b2_320_200.jpg",
                         @"http://weixue.steptowin.com:8000/data/img/20160528/qcxt7ow9syjo.png",
                         @"http://weixue.steptowin.com:8000/data/img/20160527/zeol7j6gsto9.png",
                         @"http://weixue.steptowin.com:8000/data/img/20160413/wag5q4elonh4_320_200.jpg",
                         @"http://weixue.steptowin.com:8000/data/img/20160411/veuyytthy4b2_320_200.jpg",
                         @"http://weixue.steptowin.com:8000/data/img/20160528/qcxt7ow9syjo.png",
                         @"http://weixue.steptowin.com:8000/data/img/20160527/zeol7j6gsto9.png",
                         @"http://weixue.steptowin.com:8000/data/img/20160413/wag5q4elonh4_320_200.jpg",
                         @"http://weixue.steptowin.com:8000/data/img/20160411/veuyytthy4b2_320_200.jpg",
                         @"http://weixue.steptowin.com:8000/data/img/20160528/qcxt7ow9syjo.png",
                         @"http://weixue.steptowin.com:8000/data/img/20160527/zeol7j6gsto9.png",
                         @"http://weixue.steptowin.com:8000/data/img/20160413/wag5q4elonh4_320_200.jpg"];


    /*简单线程**/
    //[self thread];
    /* 队列操作**/
    //[self operation];

    /*GCD**/
    [self GCD];

}


/********** 线程Thread 操作 ************/

- (void)thread {


    _imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
    [self.view addSubview:_imageView];
    UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame=CGRectMake(50, 500, 220, 25);
    [button setTitle:@"加载图片" forState:UIControlStateNormal];
    //添加方法
    [button addTarget:self action:@selector(threadClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];


}

- (void)threadClick {

    [NSThread detachNewThreadSelector:@selector(threadRun) toTarget:self withObject:nil];

}

- (void)threadRun {
    NSLog(@"callMainbefore_1");
    NSURL *url=[NSURL URLWithString:self.urlArr.firstObject];
    NSData *data=[NSData dataWithContentsOfURL:url];
    NSLog(@"callMainbefore_2");

    /* 直到 updateUI: 做完了 是否才开始往下操作 waitUntilDone:NO 2016-06-02 17:13:47.618 多线程处理[10042:208753] callMainbefore_1 2016-06-02 17:13:47.673 多线程处理[10042:208753] callMainbefore_2 2016-06-02 17:13:47.674 多线程处理[10042:208753] callMainAfter 2016-06-02 17:13:52.675 多线程处理[10042:208668] callMain waitUntilDone:YES 2016-06-02 17:16:05.525 多线程处理[10062:210446] callMainbefore_1 2016-06-02 17:16:05.607 多线程处理[10062:210446] callMainbefore_2 2016-06-02 17:16:10.609 多线程处理[10062:210347] callMain 2016-06-02 17:16:10.613 多线程处理[10062:210446] callMainAfter **/

    [self performSelectorOnMainThread:@selector(updateUI:) withObject:data waitUntilDone:YES];
    NSLog(@"callMainAfter");



}


- (void)updateUI:(NSData *)imageData {

    sleep(5);
    NSLog(@"callMain");
    self.imageView.image = [UIImage imageWithData:imageData];

}
/********** 线程Thread 结束 ************/

/********** 队列 操作 ************/

- (void)operation {


    CGFloat space = 10;
    CGFloat imageWH = (320 - 10*5)/4.0;

    for (NSInteger i = 0 ; i < self.urlArr.count; i++) {
        UIImageView * imageView = [[UIImageView alloc]init];
        [self.view addSubview:imageView];
        imageView.frame = CGRectMake(space +(space+imageWH)*(i%4), space +(space+imageWH)*(i/4), imageWH, imageWH);
        imageView.tag = AddTag + i;
    }

    UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame=CGRectMake(50, 500, 220, 25);
    [button setTitle:@"加载图片" forState:UIControlStateNormal];
    [button addTarget:self action:@selector(operationClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];


}


- (void)operationClick {


    NSOperationQueue * queue = [[NSOperationQueue alloc]init];
    queue.maxConcurrentOperationCount = 2;
    __weak typeof(self)weakSelf = self;
    for (NSInteger i = 0 ; i < self.urlArr.count; i++) {
        UIImageView * imageView = [self.view viewWithTag:AddTag+i];
        imageView.image = nil;
        NSBlockOperation * blockOp = [NSBlockOperation blockOperationWithBlock:^{

            NSURL *url=[NSURL URLWithString:weakSelf.urlArr[i]];
            NSData *data=[NSData dataWithContentsOfURL:url];

            dispatch_async(dispatch_get_main_queue(), ^{
                //更新UI 需要主线程
                imageView.image = [UIImage imageWithData:data];

            });

        }];
        if (i >0) {
            /* 就是 依赖前面的**/
            NSBlockOperation * preOperation = queue.operations[i-1];
            [blockOp addDependency:preOperation];
        }
        [queue addOperation:blockOp];

    }




}

/********** 队列 操作结束 ************/

/****************** GCD ******************/

- (void)GCD {

    CGFloat space = 10;
    CGFloat imageWH = (320 - 10*5)/4.0;

    for (NSInteger i = 0 ; i < self.urlArr.count; i++) {
        UIImageView * imageView = [[UIImageView alloc]init];
        [self.view addSubview:imageView];
        imageView.frame = CGRectMake(space +(space+imageWH)*(i%4), space +(space+imageWH)*(i/4), imageWH, imageWH);
        imageView.tag = AddTag + i;
    }

    UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];
    button.frame=CGRectMake(50, 500, 220, 25);
    [button setTitle:@"加载图片" forState:UIControlStateNormal];
    //添加方法
    [button addTarget:self action:@selector(GCDClick) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:button];
}

/* 串行执行**/
- (void)GCDClick {

    __weak typeof(self)weakSelf = self;
    dispatch_queue_t serialQueue = dispatch_queue_create("LeeGCDQueue", DISPATCH_QUEUE_SERIAL);
    for (NSInteger i = 0 ; i < self.urlArr.count; i++) {
        UIImageView * imageView = [self.view viewWithTag:AddTag+i];
        imageView.image = nil;
        dispatch_async(serialQueue, ^{

            NSURL *url=[NSURL URLWithString:weakSelf.urlArr[i]];
            NSData *data=[NSData dataWithContentsOfURL:url];
            dispatch_async(dispatch_get_main_queue(), ^{

                //更新UI 需要主线程
                imageView.image = [UIImage imageWithData:data];
            });


        });

    }

}

///* 并发执行**/
//- (void)GCDClick {
// 
// __weak typeof(self)weakSelf = self;
// dispatch_queue_t globalQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
// for (NSInteger i = 0 ; i < self.urlArr.count; i++) {
// UIImageView * imageView = [self.view viewWithTag:AddTag+i];
// imageView.image = nil;
// dispatch_async(globalQueue, ^{
// 
// NSURL *url=[NSURL URLWithString:weakSelf.urlArr[i]];
// NSData *data=[NSData dataWithContentsOfURL:url];
// dispatch_async(dispatch_get_main_queue(), ^{
// 
// //更新UI 需要主线程
// imageView.image = [UIImage imageWithData:data];
// });
// 
// 
// });
// 
// }
// 
//}

/****************** GCD 结束 ******************/




@end