多线程Demo1 了解

 
首先演示一下主线程的阻塞
 
//  DYFViewController.m
//  623-01-阻塞多线程
//
//  Created by dyf on 14-6-23.
//  Copyright (c) 2014年 ___FULLUSERNAME___. All rights reserved.
//
 
#import "DYFViewController.h"
 
@interface DYFViewController ()
 
@end
 
@implementation DYFViewController
- (IBAction)btnOnClick {
    // 1.获取当前的线程
    NSThread *thread = [NSThread currentThread];
     
    // 2.打印线程
    NSLog(@"%@", thread);
     
    // 3.执行一线耗时的操作
    for (int i = 0; i < 9999; i++) {
        NSLog(@"%@", thread);
        // 此时点击按钮,在执行完耗时操作之前,按钮一直是高亮状态,期间用户点击其他的UI控件也不好响应
    }
}
 
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}
 
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
 

@end

 

 

 

容易发现,在耗时操作期间,其它UI操作都被延时了,造成用户的卡顿现象

 

--------创建子线程方法1--pthread

 

//  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 *thread = [NSThread currentThread];
     
    // 2.打印线程
    NSLog(@"%@", thread);
     
    // 3.执行一线耗时的操作 : 创建一套子线程
     
    pthread_t threadId;
    pthread_create(&threadId, NULL, *run, NULL);
    
}
 
 

@end

 
 
posted @ 2015-07-21 12:47  Cheetah_yang  阅读(142)  评论(0编辑  收藏  举报