源码0501-04-了解-线程的状态

04-了解-线程的状态

//  ViewController.m
//  04-了解-线程的状态
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [NSThread detachNewThreadSelector:@selector(run) toTarget:self withObject:nil];
}

- (void)run
{
    for (NSInteger i = 0; i<100; i++) {
        NSLog(@"-----%zd", i);
        
        if (i == 49) {
            [NSThread exit]; // 直接退出线程
        }
    }
}

- (void)run2
{
    NSLog(@"-------");
//    [NSThread sleepForTimeInterval:2]; // 让线程睡眠2秒（阻塞2秒）
//    [NSThread sleepUntilDate:[NSDate distantFuture]];
    [NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:2]];
    NSLog(@"-------");
}

@end

05-掌握-线程安全

加锁－多个线程同时干一件事件会有问题；

//  ViewController.m
//  05-掌握-线程安全
#import "ViewController.h"

@interface ViewController ()
/** 售票员01 */
@property (nonatomic, strong) NSThread *thread01;
/** 售票员02 */
@property (nonatomic, strong) NSThread *thread02;
/** 售票员03 */
@property (nonatomic, strong) NSThread *thread03;

/** 票的总数 */
@property (nonatomic, assign) NSInteger ticketCount;

/** 锁对象 */
//@property (nonatomic, strong) NSObject *locker;
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
//    self.locker = [[NSObject alloc] init];
    
    self.ticketCount = 100;
    //创建了3条线程；给每条线程去了名字；
    self.thread01 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:nil];
    self.thread01.name = @"售票员01";
    
    self.thread02 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:nil];
    self.thread02.name = @"售票员02";
    
    self.thread03 = [[NSThread alloc] initWithTarget:self selector:@selector(saleTicket) object:nil];
    self.thread03.name = @"售票员03";
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    [self.thread01 start];
    [self.thread02 start];
    [self.thread03 start];
}

- (void)saleTicket
{
    while (1) {
        @synchronized(self) {传一个锁的标识对象
            // 先取出总数
            NSInteger count = self.ticketCount;
            if (count > 0) {
                self.ticketCount = count - 1;
                NSLog(@"%@卖了一张票，还剩下%zd张", [NSThread currentThread].name, self.ticketCount);
            } else {
                NSLog(@"票已经卖完了");
                break;
            }
        }
    }
}

@end

06-掌握-线程间通信-下载图片

//  ViewController.m
//  06-掌握-线程间通信-下载图片
#import "ViewController.h"

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    // 另外一种线程之间的通信方式
　　//    NSPort;
　　//    NSMessagePort;
　　//    NSMachPort;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
　　　//直接就是self调用了
    [self performSelectorInBackground:@selector(download3) withObject:nil];
}

- (void)download3
{
    // 图片的网络路径
    NSURL *url = [NSURL URLWithString:@"http://img.pconline.com.cn/images/photoblog/9/9/8/1/9981681/200910/11/1255259355826.jpg"];
    
    // 加载图片
    NSData *data = [NSData dataWithContentsOfURL:url];
    
    // 生成图片
    UIImage *image = [UIImage imageWithData:data];
    
    // 回到主线程，显示图片
    [self.imageView performSelector:@selector(setImage:) onThread:[NSThread mainThread] withObject:image waitUntilDone:NO];
//    [self.imageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:NO];
//    [self performSelectorOnMainThread:@selector(showImage:) withObject:image waitUntilDone:YES];
}

//- (void)showImage:(UIImage *)image
//{
//    self.imageView.image = image;
//}

- (void)download2
{
    // 图片的网络路径
    NSURL *url = [NSURL URLWithString:@"http://img.pconline.com.cn/images/photoblog/9/9/8/1/9981681/200910/11/1255259355826.jpg"];
    
    CFTimeInterval begin = CFAbsoluteTimeGetCurrent();
    // 根据图片的网络路径去下载图片数据
    NSData *data = [NSData dataWithContentsOfURL:url];
    CFTimeInterval end = CFAbsoluteTimeGetCurrent();
    
    NSLog(@"%f", end - begin);
    
    // 显示图片
    self.imageView.image = [UIImage imageWithData:data];
}

- (void)download
{
    // 图片的网络路径
    NSURL *url = [NSURL URLWithString:@"http://img.pconline.com.cn/images/photoblog/9/9/8/1/9981681/200910/11/1255259355826.jpg"];
    
    NSDate *begin = [NSDate date];
    // 根据图片的网络路径去下载图片数据
    NSData *data = [NSData dataWithContentsOfURL:url];

    NSDate *end = [NSDate date];
    
    NSLog(@"%f", [end timeIntervalSinceDate:begin]);
    
    // 显示图片
    self.imageView.image = [UIImage imageWithData:data];
}

@end