多线程 NSThread 了解

用NSThread创建子线程的3种方法

//  DYFViewController.m
//  623-02-pthread
//
//  Created by dyf on 14-6-23.
//  Copyright (c) 2014年 ___FULLUSERNAME___. All rights reserved.
//

#import "DYFViewController.h"
#import <pthread.h>

@interface DYFViewController ()

@end

@implementation DYFViewController

//// c语言函数
//void *run(void *data)
//{
//    // 1.获取当前的线程
//    NSThread *cThread = [NSThread currentThread];
//
//    // 2.打印线程
//    NSLog(@"%@", cThread);
//
//    // 3.h耗时操作
//    for (int i = 0; i < 9999; i++) {
//        NSLog(@"%@", cThread);
//    }
//
//    return NULL;
//}

- ( IBAction )btnOnClick {
    // 1.获取当前的线程
    NSThread *cthread = [ NSThread currentThread];

    NSThread *mt = [ NSThread mainThread];
    // 2.打印线程
    NSLog (@ "%@" , cthread);

    NSLog (@ "%@" , mt);

    // 3.执行一线耗时的操作 ： 创建一套子线程
    [ self threadCreate3];

}
- ( void )run:( NSString *)parma
{
//    [NSThread threadPriority];
//
//    [NSThread setThreadPriority:0.55];
    // 取值0-1，默认0.5
    for ( int i = 0; i < 9999; i++) {
        NSLog (@ "%@---------%@" , [ NSThread currentThread], parma);
    }
}

- ( void )threadCreate5
{
    // 分离出的子线程
    [ NSThread detachNewThreadSelector: @selector (run:) toTarget: self withObject:@ "2222222" ];
}
- ( void )threadCreate4
{
    // 分离出的子线程
    [ NSThread detachNewThreadSelector: @selector (run:) toTarget: self withObject:@ "2222222" ];
}

/**
 *  NSThread创建方式3：隐世线程创建，并且直接（自动）启动
 */
- ( void )threadCreate3
{
    [ self performSelectorInBackground: @selector (run:) withObject:@ "333333" ];
}

/**
 *  创建方式2：创建完线程后自动启动
 */
- ( void )threadCreate2
{
    // 分离出的子线程
    [ NSThread detachNewThreadSelector: @selector (run:) toTarget: self withObject:@ "2222222" ];
}

/**
 *  创建方式1：①先创建初始化子线程②再启动
 */
- ( void )threadCreate
{
    NSThread *thread1 = [[ NSThread alloc] initWithTarget: self selector: @selector (run:) object:@ "heheh" ];
    thread1.name = @ "thread1" ;
    // 开启线程
    [thread1 start];

    NSThread *thread2 = [[ NSThread alloc] initWithTarget: self selector: @selector (run:) object:@ "heheh" ];
    thread2.name = @ "thread2" ;
    // 开启线程
    [thread2 start];

    NSThread *thread3 = [[ NSThread alloc] initWithTarget: self selector: @selector (run:) object:@ "heheh" ];
    thread3.name = @ "33" ;
    // 开启线程
    [thread3 start];
}

@end

 利用NSThread在开发中也不常用，了解即可