ios 异步多线程 获取数据

- - (id)initWithTarget:(id)target selector:(SEL)selector object:(id)argument
- + (void)detachNewThreadSelector:(SEL)aSelector toTarget:(id)aTarget withObject:(id)anArgument
- 1、[NSThread detachNewThreadSelector:@selector(doSomething:) toTarget:self withObject:nil];
- 2、NSThread* myThread = [[NSThread alloc] initWithTarget:self
- selector:@selector(doSomething:)
- object:nil];
- [myThread start];
- [Obj performSelectorInBackground:@selector(doSomething) withObject:nil];
- //
- // ViewController.m
- // NSThreadDemo
- //
- // Created by rongfzh on 12-9-23.
- // Copyright (c) 2012年 rongfzh. All rights reserved.
- //
- #import "ViewController.h"
- #define kURL @"http://avatar.csdn.net/2/C/D/1_totogo2010.jpg"
- @interface ViewController ()
- @end
- @implementation ViewController
- -(void)downloadImage:(NSString *) url{
- NSData *data = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:url]];
- UIImage *image = [[UIImage alloc]initWithData:data];
- if(image == nil){
- }else{
- [self performSelectorOnMainThread:@selector(updateUI:) withObject:image waitUntilDone:YES];
- }
- }
- -(void)updateUI:(UIImage*) image{
- self.imageView.image = image;
- }
- - (void)viewDidLoad
- {
- [super viewDidLoad];
- // [NSThread detachNewThreadSelector:@selector(downloadImage:) toTarget:self withObject:kURL];
- NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(downloadImage:) object:kURL];
- [thread start];
- }
- - (void)didReceiveMemoryWarning
- {
- [super didReceiveMemoryWarning];
- // Dispose of any resources that can be recreated.
- }
- @end
- [self performSelectorOnMainThread:@selector(updateUI:) withObject:image waitUntilDone:YES];
- performSelector:onThread:withObject:waitUntilDone:

- #import <UIKit/UIKit.h>
- @class ViewController;
- @interface AppDelegate : UIResponder <UIApplicationDelegate>
- {
- int tickets;
- int count;
- NSThread* ticketsThreadone;
- NSThread* ticketsThreadtwo;
- NSCondition* ticketsCondition;
- NSLock *theLock;
- }
- @property (strong, nonatomic) UIWindow *window;
- @property (strong, nonatomic) ViewController *viewController;
- @end
- - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
- {
- tickets = 100;
- count = 0;
- theLock = [[NSLock alloc] init];
- // 锁对象
- ticketsCondition = [[NSCondition alloc] init];
- ticketsThreadone = [[NSThread alloc] initWithTarget:self selector:@selector(run) object:nil];
- [ticketsThreadone setName:@"Thread-1"];
- [ticketsThreadone start];
- ticketsThreadtwo = [[NSThread alloc] initWithTarget:self selector:@selector(run) object:nil];
- [ticketsThreadtwo setName:@"Thread-2"];
- [ticketsThreadtwo start];
- self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
- // Override point for customization after application launch.
- self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
- self.window.rootViewController = self.viewController;
- [self.window makeKeyAndVisible];
- return YES;
- }
- - (void)run{
- while (TRUE) {
- // 上锁
- // [ticketsCondition lock];
- [theLock lock];
- if(tickets >= 0){
- [NSThread sleepForTimeInterval:0.09];
- count = 100 - tickets;
- NSLog(@"当前票数是:%d,售出:%d,线程名:%@",tickets,count,[[NSThread currentThread] name]);
- tickets--;
- }else{
- break;
- }
- [theLock unlock];
- // [ticketsCondition unlock];
- }
- }
- #import "AppDelegate.h"
- #import "ViewController.h"
- @implementation AppDelegate
- - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
- {
- tickets = 100;
- count = 0;
- theLock = [[NSLock alloc] init];
- // 锁对象
- ticketsCondition = [[NSCondition alloc] init];
- ticketsThreadone = [[NSThread alloc] initWithTarget:self selector:@selector(run) object:nil];
- [ticketsThreadone setName:@"Thread-1"];
- [ticketsThreadone start];
- ticketsThreadtwo = [[NSThread alloc] initWithTarget:self selector:@selector(run) object:nil];
- [ticketsThreadtwo setName:@"Thread-2"];
- [ticketsThreadtwo start];
- NSThread *ticketsThreadthree = [[NSThread alloc] initWithTarget:self selector:@selector(run3) object:nil];
- [ticketsThreadthree setName:@"Thread-3"];
- [ticketsThreadthree start];
- self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
- // Override point for customization after application launch.
- self.viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
- self.window.rootViewController = self.viewController;
- [self.window makeKeyAndVisible];
- return YES;
- }
- -(void)run3{
- while (YES) {
- [ticketsCondition lock];
- [NSThread sleepForTimeInterval:3];
- [ticketsCondition signal];
- [ticketsCondition unlock];
- }
- }
- - (void)run{
- while (TRUE) {
- // 上锁
- [ticketsCondition lock];
- [ticketsCondition wait];
- [theLock lock];
- if(tickets >= 0){
- [NSThread sleepForTimeInterval:0.09];
- count = 100 - tickets;
- NSLog(@"当前票数是:%d,售出:%d,线程名:%@",tickets,count,[[NSThread currentThread] name]);
- tickets--;
- }else{
- break;
- }
- [theLock unlock];
- [ticketsCondition unlock];
- }
- }
- - (void)doSomeThing:(id)anObj
- {
- @synchronized(anObj)
- {
- // Everything between the braces is protected by the @synchronized directive.
- }
- }
- #import "ViewController.h"
- #define kURL @"http://avatar.csdn.net/2/C/D/1_totogo2010.jpg"
- @interface ViewController ()
- @end
- @implementation ViewController
- - (void)viewDidLoad
- {
- [super viewDidLoad];
- NSInvocationOperation *operation = [[NSInvocationOperation alloc]initWithTarget:self
- selector:@selector(downloadImage:)
- object:kURL];
- NSOperationQueue *queue = [[NSOperationQueue alloc]init];
- [queue addOperation:operation];
- // Do any additional setup after loading the view, typically from a nib.
- }
- -(void)downloadImage:(NSString *)url{
- NSLog(@"url:%@", url);
- NSURL *nsUrl = [NSURL URLWithString:url];
- NSData *data = [[NSData alloc]initWithContentsOfURL:nsUrl];
- UIImage * image = [[UIImage alloc]initWithData:data];
- [self performSelectorOnMainThread:@selector(updateUI:) withObject:image waitUntilDone:YES];
- }
- -(void)updateUI:(UIImage*) image{
- self.imageView.image = image;
- }

- [queue setMaxConcurrentOperationCount:5];
- dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
- // 耗时的操作
- dispatch_async(dispatch_get_main_queue(), ^{
- // 更新界面
- });
- });
- dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
- NSURL * url = [NSURL URLWithString:@"http://avatar.csdn.net/2/C/D/1_totogo2010.jpg"];
- NSData * data = [[NSData alloc]initWithContentsOfURL:url];
- UIImage *image = [[UIImage alloc]initWithData:data];
- if (data != nil) {
- dispatch_async(dispatch_get_main_queue(), ^{
- self.imageView.image = image;
- });
- }
- });

- dispatch_queue_t globalQ = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
- dispatch_queue_t mainQ = dispatch_get_main_queue();
- dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
- dispatch_group_t group = dispatch_group_create();
- dispatch_group_async(group, queue, ^{
- [NSThread sleepForTimeInterval:1];
- NSLog(@"group1");
- });
- dispatch_group_async(group, queue, ^{
- [NSThread sleepForTimeInterval:2];
- NSLog(@"group2");
- });
- dispatch_group_async(group, queue, ^{
- [NSThread sleepForTimeInterval:3];
- NSLog(@"group3");
- });
- dispatch_group_notify(group, dispatch_get_main_queue(), ^{
- NSLog(@"updateUi");
- });
- dispatch_release(group);
- 2012-09-25 16:04:16.737 gcdTest[43328:11303] group1
- 2012-09-25 16:04:17.738 gcdTest[43328:12a1b] group2
- 2012-09-25 16:04:18.738 gcdTest[43328:13003] group3
- 2012-09-25 16:04:18.739 gcdTest[43328:f803] updateUi
- dispatch_queue_t queue = dispatch_queue_create("gcdtest.rongfzh.yc", DISPATCH_QUEUE_CONCURRENT);
- dispatch_async(queue, ^{
- [NSThread sleepForTimeInterval:2];
- NSLog(@"dispatch_async1");
- });
- dispatch_async(queue, ^{
- [NSThread sleepForTimeInterval:4];
- NSLog(@"dispatch_async2");
- });
- dispatch_barrier_async(queue, ^{
- NSLog(@"dispatch_barrier_async");
- [NSThread sleepForTimeInterval:4];
- });
- dispatch_async(queue, ^{
- [NSThread sleepForTimeInterval:1];
- NSLog(@"dispatch_async3");
- });
- 2012-09-25 16:20:33.967 gcdTest[45547:11203] dispatch_async1
- 2012-09-25 16:20:35.967 gcdTest[45547:11303] dispatch_async2
- 2012-09-25 16:20:35.967 gcdTest[45547:11303] dispatch_barrier_async
- 2012-09-25 16:20:40.970 gcdTest[45547:11303] dispatch_async3
- dispatch_apply(5, globalQ, ^(size_t index) {
- // 执行5次
- });
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