多線程併發 NSThread

//

//  ViewController.m

//  NSThread_多線程併發

//

//  Created by dc008 on 15/12/24.

//  Copyright © 2015年 崔曉宇. All rights reserved.

//

#import "ViewController.h"

#define ROW 5

#define COLUMN 3

#define IMAGE_COUNT ROW*COLUMN

#define WIDTH 100 //圖片寬

#define HEIGHT WIDTH //圖片高

@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];

        }

        

    }

    //添加按鈕

    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];

    button.frame = CGRectMake(50, 600, 275, 30);

    [button setTitle:@"加載圖片" forState:UIControlStateNormal];

    [button addTarget:self action:@selector(useMultiThread2) forControlEvents:UIControlEventTouchUpInside];

    [self.view addSubview:button];

}

- (void)updateImage : (NSArray *)arr{

    UIImage *image = [UIImage imageWithData:arr[0]];

    UIImageView *imageView = _imageViews[[arr[1]intValue] ];

    imageView.image = image;

}

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

    int i = [index intValue];

    if (![index isEqual: @14]) {

        //若是當前進程不是最後一個,就休眠2秒

        [NSThread sleepForTimeInterval:2];

    }

    NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:array[i]]];

    NSLog(@"%@",[NSString stringWithFormat:@"%@",array[i]]);

    NSArray *arrData = @[data,index];

    [self performSelectorOnMainThread:@selector(updateImage:) withObject:arrData waitUntilDone:YES];

}

- (void)useMultiThread{

    for (int i; i < IMAGE_COUNT; i++) {

        NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(loadImage:) object:[NSNumber numberWithInt:i]];

        thread.name = [NSString stringWithFormat:@"個人線程:%d",i];

        [thread start];

    }

}

#pragma mark 改變線程優先級

//提升它被優先加載的概率，可是它頁未必就第一個加載。1.其餘進程是先啓動的 2.網絡情況咱們沒辦法修改

- (void)useMultiThread2{

    NSMutableArray *threads = [NSMutableArray array];

    for (int i=0; i<IMAGE_COUNT; i++) {

        NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(loadImage:) object:[NSNumber numberWithInt:i]];

        //設置進程優先級(範圍0-1)

        if (i == IMAGE_COUNT - 1) {

            thread.threadPriority = 1.0;

        }

        else{

            thread.threadPriority = 0;

        }

        [threads addObject:thread];

    }

    for (int i = 0; i<IMAGE_COUNT; i++) {

        NSThread *thread =threads[i];

        [thread start];

    }

    

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end