NSThread-02-多线程-四种创建方式

//
//  ViewController.m
//  00-NSThread（四种方式）
//
//  Created by mac on 16/4/20.
//  Copyright © 2016年 mac. All rights reserved.
//
#import "CustumOperation.h"
#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
/**
 *  线程优先级是系统自动分配的，随机分配
 */

- (void)viewDidLoad {
    [super viewDidLoad];

    [self createdThread1];
    [self createdThread2];
    [self createdThread3];
    [self createdThread4];
}

/**
 *  创建多线程方法一
 */
- (void)createdThread1 {
    
    //1.创建多线程方法（一）NSThread
    NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(threadAction) object:nil];
    thread.name = @"thread1111";
    
    //启动多线程
    [thread start];
    
    //延迟调用cancel方法取消线程
    [self performSelector:@selector(cancelThread:) withObject:thread afterDelay:0.2];
    
    //打印主线程
    NSLog(@"%d===main:%@==%lf", [NSThread isMainThread],[NSThread currentThread], [NSThread threadPriority]);
}
- (void)threadAction {
    
    //3）休眠
    [NSThread sleepForTimeInterval:2];
    
    if ([[NSThread currentThread] isCancelled]) {
    
        NSLog(@"当前线程退出");
        
        //2）退出线程
        [NSThread exit];
    }

    for (int i = 0; i < 50; i ++) {
        
        NSLog(@"%@", [NSThread currentThread]);
    }
    
    NSLog(@"%lf,%d", [NSThread threadPriority], [NSThread isMainThread]);
}
- (void)cancelThread:(NSThread *)thread {
    
    //1）标记线程状态为：即将取消并非真正已经取消了
    [thread cancel];
}

/**
 *  创建多线程方法二
 */
- (void)createdThread2 {
    
    [NSThread detachNewThreadSelector:@selector(threadAction) toTarget:self withObject:nil];
}
/**
 *  创建多线程方法三
 */
- (void)createdThread3 {
    
    [self performSelectorInBackground:@selector(threadAction) withObject:nil];
}
/**
 *  创建多线程方法四
 */
- (void)createdThread4 {
    
    CustumOperation *custum = [[CustumOperation alloc] init];
    
    //start和main的区别： main只会调用方法不会开启新的线程
    [custum start];
//    [custum main];
}



@end