IOS多线程处理 三种多线程的实例

#import <UIKit/UIKit.h>
@interface ViewController1 : UIViewController{
NSCondition *_condition;
NSThread *_thread_1;
NSThread *_thread_2;
}
@end

/
//  ViewController1.m
//  Thread_demo
//
//  Created by MAC on 13-4-22.
//  Copyright (c) 2013年 李开涌. All rights reserved.
//
#import "ViewController1.h"
@interface ViewController1 ()
@end
@implementation ViewController1
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
self.title=@"多线程NSThread";
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];

//创建一个进程锁，实现线程同步
_condition=[[NSCondition alloc] init];

//创建线程1
_thread_1=[[NSThread alloc]initWithTarget:self selector:@selector(run) object:nil];
[_thread_1 setName:@"thread_1"];
[_thread_1 start];

//创建线程2
_thread_2=[[NSThread alloc]initWithTarget:self selector:@selector(run) object:nil];
[_thread_2 setName:@"thread_2"];
[_thread_2 start];

}
#pragma mark--线程执行方法
-(void)run{
//进程上锁
[_condition lock];
NSLog(@"运行的线程名：%@",[[NSThread currentThread]name]);
if ([[[NSThread currentThread]name] isEqualToString:@"thread_1"]) {
NSLog(@"111");
NSURL *imageUrl_1=[NSURL URLWithString:@"http://t.beauty-soft.net/upload/ceiba20130224_014522_8679.jpg"];
NSData *data_1=[NSData dataWithContentsOfURL:imageUrl_1];
UIImage *image_1=[UIImage imageWithData:data_1];
UIImageView *imageView_1=[[UIImageView alloc] initWithImage:image_1];
imageView_1.frame=CGRectMake(60, 20, 200, 200);
[self.view addSubview:imageView_1];
[imageView_1 release];

}else if([[[NSThread currentThread]name] isEqualToString:@"thread_2"]){
NSLog(@"222");

NSURL *imageUrl_2=[NSURL URLWithString:@"http://t.beauty-soft.net/upload/ceiba20120704_121437_3455.jpg"];
NSData *data_2=[NSData dataWithContentsOfURL:imageUrl_2];
UIImage *image_2=[UIImage imageWithData:data_2];
UIImageView *imageView_2=[[UIImageView alloc] initWithImage:image_2];
imageView_2.frame=CGRectMake(60, 250, 200, 200);
[self.view addSubview:imageView_2];
[imageView_2 release];
}
//解锁
[_condition unlock];

}
-(void)dealloc{
[_thread_1 release];
[_thread_2 release];
[_condition release];
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end

//  ViewController2.m
//  Thread_demo
//
//  Created by MAC on 13-4-22.
//  Copyright (c) 2013年 李开涌. All rights reserved.
//
#import "ViewController2.h"
@interface ViewController2 ()
@end
@implementation ViewController2
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
self.title=@"线程队列";
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// 线程队列管理器，实现线程并行运行
_opeartionQueue=[[NSOperationQueue alloc] init];
//队列最大同时运行数量
[_opeartionQueue setMaxConcurrentOperationCount:1];

tags=20;
//创建线程1
NSInvocationOperation *invocationOpearation_1=[[[NSInvocationOperation alloc] initWithTarget:self selector:@selector(run:) object:@"http://t.beauty-soft.net/upload/ceiba20130224_014522_8679.jpg"] autorelease];
//创建线程2
NSInvocationOperation *invocationOpearation_2=[[[NSInvocationOperation alloc] initWithTarget:self selector:@selector(run:) object:@"http://t.beauty-soft.net/upload/ceiba20120704_121437_3455.jpg"] autorelease];

NSArray *array=@[invocationOpearation_1,invocationOpearation_2];
//把程序添加到管理器中
[_opeartionQueue addOperations:array waitUntilFinished:YES];
}
-(void)run:(NSString *)imageStrinUrl{
NSLog(@"%@",[_opeartionQueue operations]);
NSLog(@"mainQueue%@",[NSOperationQueue mainQueue]);
NSLog(@"i==%i",tags);
NSLog(@"urlStr：%@",imageStrinUrl);
NSURL *url=[NSURL URLWithString:imageStrinUrl];
NSData *data=[NSData dataWithContentsOfURL:url];
UIImage *image=[UIImage imageWithData:data];
UIImageView *imageView=[[[UIImageView alloc] initWithImage:image]autorelease];
imageView.frame=CGRectMake(60, tags, 200, 200);
tags+=200;
//通知主线程更新UI
[self performSelectorOnMainThread:@selector(updateUI:) withObject:imageView waitUntilDone:NO];

}
-(void)updateUI:(UIImageView *)imageView{

[self.view addSubview:imageView];

}
- (void)dealloc
{
[_opeartionQueue release];
[super dealloc];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end

显示loading
self.indicator.hidden = NO;
[self.indicator startAnimating];
//进入异步线程
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
//异步下载图片
NSURL * url = [NSURL URLWithString:@"http://anImageUrl"];
NSData * data = [NSData dataWithContentsOfURL:url];
//网络请求之后进入主线程
dispatch_async(dispatch_get_main_queue(), ^{
//关闭loading
[self.indicator stopAnimating];
self.indicator.hidden = YES;
if (data) {//显示图片
self.imageView.image = [UIImage imageWithData:data];
}
});
});

延迟2秒执行：
double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
// code to be executed on the main queue after delay
});

dispatch_queue_t custom_queue = dispatch_queue_create(“customQueue”, NULL);
dispatch_async(custom_queue, ^{
//doing something in custom_queue
});
dispatch_release(custom_queue);

dispatch_group_t group = dispatch_group_create();
dispatch_group_async(group, dispatch_get_global_queue(0,0), ^{
// 并行执行的线程一
});
dispatch_group_async(group, dispatch_get_global_queue(0,0), ^{
// 并行执行的线程二
});
dispatch_group_notify(group, dispatch_get_global_queue(0,0), ^{
// 汇总结果
});