iOS学习之路--多线程
来源：互联网 发布：波兰式算法 编辑：程序博客网 时间：2024/04/29 22:09
//// TableViewController.m// UI-W6-L22-Thread//// Created by lanou3g on 15/10/19.// Copyright (c) 2015年 Seth. All rights reserved.//#import "TableViewController.h"@interface TableViewController ()//线程队列@property (nonatomic,strong)NSOperationQueue *operationQueue;@end@implementation TableViewController- (void)viewDidLoad { [super viewDidLoad]; // Uncomment the following line to preserve selection between presentations. // self.clearsSelectionOnViewWillAppear = NO; // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem;' //返回主线程的方法 dispatch_sync(dispatch_get_main_queue(), ^{//从子线程回到主线程的方法,但是如果在主线程里面用这个方法,会回不去,卡住程序运行// NSLog(@"阻塞了"); }); //把耗时的操作放在子线程里执行; 关于UI的添加和刷新都必须在主线程里操作}- (IBAction)leijai:(UIButton *)sender { int sum = 0; for (int i = 1; i <= 635500000; i++) { sum = sum + i; } NSLog(@"sum===%d",sum);}-(void)printNumbers { [[NSThread currentThread] cancel]; for (int i = 0; i < 100 ; i++) { NSLog(@"%d,当前线程%@",i,[NSThread currentThread] ); }}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}#pragma mark - Table view data source- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {#warning Potentially incomplete method implementation. // Return the number of sections. return 1;}- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {#warning Incomplete method implementation. // Return the number of rows in the section. return 20;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath]; // Configure the cell... /** *多线程 1,NSThread */ //NSThread 创建初始化initwithTarget:执行者selector:选择器 object:参数对象 //通过init方法创建NSThread对象,需要手动开启start //2 NSThread开启线程并自动执行 // [NSThread detachNewThreadSelector:@selector(printNumbers) toTarget:self withObject:nil]; // [self printNumbers]; /** *NSOPerationQueue 线程队列 */ //1,NSInvocationOperation操作 // NSInvocationOperation *iOP = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumbers) object:nil]; //Operation 是不能自己执行,需要通过队列进行调用 // [[NSOperationQueue mainQueue] addOperation:iOP]; //2,NSBlockOperation NSBlockOperation *bOp = [[NSBlockOperation alloc] init]; //以代码块的方式添加操作 [bOp addExecutionBlock:^{ for (int i = 0; i < 100 ; i++) { NSLog(@"%d,当前线程%@",i,[NSThread currentThread] ); } }]; //添加到线程队列// [[NSOperationQueue mainQueue] addOperation:bOp]; [self.operationQueue addOperation:bOp];// NSLog(@"%@",self.operationQueue.name); return cell;}//operationQueue的get方法-(NSOperationQueue *)operationQueue { if (!_operationQueue) { _operationQueue = [[NSOperationQueue alloc] init]; [_operationQueue setName:@"哈哈"]; } return _operationQueue;}@end笔记文件2
//// ViewController.m// UI-L22-Review-Seth//// Created by lanou3g on 15/10/19.// Copyright (c) 2015年 Seth. All rights reserved.//#import "ViewController.h"@interface ViewController ()//线程队列@property (nonatomic,strong)NSOperationQueue *opertationQueue;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. //一个进程是由一个或多个线程组成,进程只负责资源的调度和分配,线程才是程序真正的执行单元,负责代码的执行. //每个正在运行的程序,至少包含一个线程,这个线程叫做主线程. //主线程在程序启动时被创建,用于执行main函数 //只有一个主线程的程序,称作单线程程序 //主线程负责执行程序的所有代码,(ui展现及刷新,网络请求,)这些程序只能顺序执行,无法并发执行. //ios允许用户自己开辟新的线程,相对于主线程来说,这些线程,称作子线程. //子线程与主线程是独立的运行单元,互不影响,能够并发执行 //ios中关于UI的刷新和添加必须在主线程中操作!! /** *NSThread 是一个轻量级的多线程, */ //1, NSThread开启线程并自动执行 [NSThread detachNewThreadSelector:@selector(printNumbers:) toTarget:self withObject:@"1111"]; [NSThread detachNewThreadSelector:@selector(printNumbers:) toTarget:self withObject:@"2222"]; //2,NSThread 创建初始化initWithTarget:执行者 selector:选择器 object:参数对象 //通过init方法创建NSThread对象,需要手动开启start NSThread *thread = [[NSThread alloc] initWithTarget:self selector:@selector(printNumbers:) object:@"333"]; [thread start]; //两种方式区别:第一种方式会立即调用并执行线程,第二种必须调用start方法后才会开始执行线程,在此之前可以对线程进行一些设置,比如线程优先级等; //使用类方法创建的线程不需要进行内存清理,使用initwithTarget方法创建的线程需要释放内存 // [self printNumbers]; //走主线程 main /** * NSOPerationQueue 线程队列 */ //1, NSInvocationOperation 操作 NSInvocationOperation *iOP = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumbers:) object:@"线程队列iOP1"]; //operation不能自己执行 ,需要通过队列进行调用 [[NSOperationQueue mainQueue] addOperation:iOP];//2, NSBlockOperation NSBlockOperation *bbbOp = [[NSBlockOperation alloc] init]; //以代码块方式添加操作 [bbbOp addExecutionBlock:^{ for (int i = 0; i < 11; i++) { NSLog(@"%d,%@",i,[NSThread currentThread]); } }]; //添加到线程队列 // [[NSOperationQueue mainQueue] addOperation:bbbOp]; [self.opertationQueue addOperation:bbbOp];}-(void)printNumbers:(NSString *)string { [[NSThread currentThread]cancel]; for (int i = 0; i < 15; i++) { NSLog(@"%d,当前线程%@",i,[NSThread currentThread]); NSLog(@"我是第%@子线程",string); }}//operationQueue的get方法-(NSOperationQueue *)opertationQueue { if (!_opertationQueue) { _opertationQueue = [[NSOperationQueue alloc] init]; [_opertationQueue setName:@"啊啊啊啊啊"]; } return _opertationQueue;}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end笔记文件3–共产党 GCD
//// ViewController.m// UI-W6-L22-GCD//// Created by lanou3g on 15/10/19.// Copyright (c) 2015年 Seth. All rights reserved.//#import "ViewController.h"@interface ViewController ()- (IBAction)dicclickMaxConButton:(UIButton *)sender;- (IBAction)didClickDependButton:(UIButton *)sender;//线程队列@property (nonatomic,strong)NSOperationQueue *operationQueue;//10.20@property (weak, nonatomic) IBOutlet UIImageView *imageView;- (IBAction)didNsobjectLoadImageButton:(id)sender;//总票数@property (nonatomic,assign)NSInteger count;@end@implementation ViewController- (void)viewDidLoad { [super viewDidLoad]; self.count = 100; // Do any additional setup after loading the view, typically from a nib. //主队列 主线程 NSLog(@"主队列 :%@",[NSOperationQueue mainQueue]); NSLog(@"主线程 :%@",[NSThread mainThread]); //NSBlockOperation 创建方式 ,可以便利构造,直接添加block NSBlockOperation *bOp = [NSBlockOperation blockOperationWithBlock:^{ for (int i = 0; i < 100; i++) { NSLog(@"%d, 当前线程:%@",i,[NSThread currentThread]); } }]; NSBlockOperation *bOp1 = [NSBlockOperation blockOperationWithBlock:^{ for (int i = 0; i < 100; i++) { NSLog(@"%d,bOp1当前线程: %@",i,[NSThread currentThread]); } }]; NSBlockOperation *bOp2 = [NSBlockOperation blockOperationWithBlock:^{ for (int i = 0; i < 100; i++) { NSLog(@"%d,******当前线程: %@",i,[NSThread currentThread]); } }]; //添加到主队列 [[NSOperationQueue mainQueue] addOperation:bOp]; //自定义队列 self.operationQueue = [[NSOperationQueue alloc] init]; [self.operationQueue addOperation:bOp1]; [self.operationQueue addOperation:bOp2]; self.operationQueue = [[NSOperationQueue alloc] init]; //设置最大并发数 self.operationQueue.maxConcurrentOperationCount = 4; //NSObject 简单后台方法 nsobject任何子类都可以调用 [self performSelectorInBackground:@selector(printNumber:) withObject:nil];#pragma ----GCD 中央派发机制 /** Grand Central Dispath * 基于函数,使用分发队列 */ //1,主线程队列 , 等同[NSOperationQueue mainQueue] ,串行 //2,全局线程队列, 后台队列,并行 //3,自定义线程队列,DISPATCH_QUEUE_SERIAL 串行, DISPATCH_QUEUE_CONCURRENT 并行 //创建一个自定义队列 dispatch_queue_t myQueue = dispatch_queue_create("com.lanou3g.www.myQueue", DISPATCH_QUEUE_PRIORITY_DEFAULT);//字符串为c语言字符串,无@,书写格式倒置域名格式 //队列优先级,串行/并行 //dispatch_async(队列,执行block); //dispatch_sync(队列,执行block); dispatch_async(myQueue, ^{ [self printNumber:@"GCD"]; [self printNumber:@"G1"]; }); //添加操作 dispatch_async(myQueue, ^{ [self printNumber:@"G2"]; }); // 并行队列 dispatch_queue_t conQueue = dispatch_queue_create("com.lanou3g.www.comQueue", DISPATCH_QUEUE_CONCURRENT); dispatch_async(conQueue, ^{ [self printNumber:@"G1"]; [self printNumber:@"G2"]; }); dispatch_async(conQueue, ^{ [self printNumber:@"G3"]; }); dispatch_async(conQueue, ^{ [self printNumber:@"G4"]; });}-(void)printNumber:(NSString *)name { for (int i = 0; i <10; i++) { // sleep(1); NSLog(@"%d,当前线程%@",i,[NSThread currentThread]); NSLog(@"%@",name); }}//GCD//在延迟的时间点- (IBAction)didClickAfterButton:(id)sender { dispatch_after(dispatch_time(DISPATCH_TIME_NOW,(int64_t)(5 * NSEC_PER_SEC) ),dispatch_get_main_queue(), ^{ NSLog(@"等我5秒"); });}//重复执行- (IBAction)didClickApplyButton:(id)sender { dispatch_apply(10, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(size_t t) { //参数t要添加上 NSLog(@"我在重复,第%zu次",t);//因为设置的全局队列,是并行的,所以输出的次数并没有次序 });}//当一个分组执行结束,notifiy之中的才会执行- (IBAction)didClickNotfyButton:(id)sender { //创建分组标签 dispatch_group_t groupA = dispatch_group_create(); //使用分组 //创建队列 dispatch_queue_t muQueue = dispatch_queue_create("myQueue", DISPATCH_QUEUE_CONCURRENT); //将操作添加到队列,添加分组标签 dispatch_group_async(groupA, muQueue, ^{ [self printNumber:@"groupA"]; }); dispatch_group_async(groupA, muQueue, ^{ [self printNumber:@"groupAA"]; }); //notify dispatch_group_notify(groupA, dispatch_get_global_queue (DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ NSLog(@"groupA的都执行完成以后,我才能执行"); });}//10.20 barrier线程执行时,其他线程不执行- (IBAction)didClickBarrierButton:(id)sender { //创建队列 dispatch_queue_t muQueue = dispatch_queue_create("myQueue", DISPATCH_QUEUE_CONCURRENT); //将操作添加到队列,添加分组标签 dispatch_async( muQueue, ^{ [self printNumber:@"opA"]; }); dispatch_async(muQueue, ^{ [self printNumber:@"opB"]; }); //将任务添加到队列中 此任务执行是,其他任务停止执行 dispatch_barrier_async(muQueue, ^{ [self printNumber:@"当我执行时,没人跟我抢"]; }); dispatch_async(muQueue, ^{ [self printNumber:@"opC"]; });}//声明单例 ,实现单例static NSObject *object = nil;- (IBAction)didclickOnceButton:(id)sender { static dispatch_once_t onceToken;// NSObject *objc = nil;// __block NSObject *object = objc; dispatch_once(&onceToken,^{ //once功能 整个程序运行期间,只走一次 object = [[NSObject alloc] init]; }); NSLog(@"%@",object);}//同步执行 10.20- (IBAction)didClickSyncButton:(id)sender { //同步线程里的内容不执行完成,下面的代码就不会执行 //如果放在主线程里,会阻塞线程 (主线程 diapatch_get_main_queue) //GCD的方法比前两种多线程容易出错,但是效率高 dispatch_sync(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0), ^{ NSLog(@"阻塞"); });}//将函数任务添加到队列- (IBAction)didclickAsyncFButton:(id)sender { dispatch_async_f(dispatch_get_main_queue(), nil, fun);}//输出 (上面的参数里需要一个c函数,这是一个c函数void fun(){ int i = 10; while (i > 0) { printf("HAHAHHA "); i--; }}////使用NSObject加载图片,从子线程里下载,在主线程里更新- (IBAction)didNsobjectLoadImageButton:(id)sender { //NSObject进入子线程 [self performSelectorInBackground:@selector(loadImageUrl) withObject:nil];}-(void)loadImageUrl { NSURL *url = [NSURL URLWithString:@"http://img3.douban.com/view/event_poster/median/public/10f53a2ad8b38c5.jpg"]; NSData *data = [[NSData alloc] initWithContentsOfURL:url]; UIImage *image = [[UIImage alloc] initWithData:data]; //返回主线程 更新UI [self.imageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:YES];//在子线程里下载图片,到主线程里去更新}//线程互斥- (IBAction)ClickLockButton:(id)sender { //创建线程锁 NSLock *lock = [[NSLock alloc] init]; dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ for (int i = 0; i < 50; i++) { //加锁 [lock lock]; NSLog(@"小红买到了第%ld张票",self.count); self.count--; //解锁 [lock unlock]; } }); dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ for (int i = 0; i < 50; i++) { //加锁 [lock lock]; NSLog(@"888绿买到了第%ld张票",self.count); self.count--; //解锁 [lock unlock]; } });}- (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}//设置最大并发数- (IBAction)dicclickMaxConButton:(UIButton *)sender { //线程队列的最大并发数 NSInvocationOperation *iOP1 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumber) object:nil]; NSInvocationOperation *iOP2 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumber) object:nil]; NSInvocationOperation *iOP3 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumber) object:nil]; NSInvocationOperation *iOP4 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumber) object:nil]; NSInvocationOperation *iOP5 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumber) object:nil]; NSInvocationOperation *iOP6 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumber) object:nil]; //添加到线程队列 [self.operationQueue addOperations:@[iOP1,iOP2,iOP3,iOP4,iOP5,iOP6] waitUntilFinished:YES];}//设置依赖关系- (IBAction)didClickDependButton:(UIButton *)sender { NSInvocationOperation *iOP1 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumber:) object:@"op1"]; NSInvocationOperation *iOP2 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumber:) object:@"op2"]; NSInvocationOperation *iOP3 = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(printNumber:) object:@"op3"]; //线程之间的依赖关系 必须等到被依赖的上一级线程全部执行完成之后,依赖的线程才能开始执行 [iOP1 addDependency:iOP2]; [iOP2 addDependency:iOP3]; [self.operationQueue addOperations:@[iOP1,iOP2,iOP3] waitUntilFinished:YES];}@end 0 0
- iOS学习之路--多线程
- iOS多线程学习之GCD
- iOS 多线程学习之GCD
- iOS多线程之GCD学习
- iOS学习之 - 多线程应用
- IOS学习之路八（GCD与多线程）
- IOS学习之路八（GCD与多线程）
- IOS学习笔记49--多线程之Thread
- IOS学习笔记50--多线程之NSOperation
- iOS多线程学习之NSOperation（一）
- iOS多线程学习之NSOperation（二）
- iOS多线程学习之NSOperation（三）
- ios多线程学习之GCD线程锁
- IOS多线程系统学习之NSThread
- iOS-多线程编程学习之NSThread(三)
- iOS-多线程编程学习之NSOperation(四)
- [iOS学习]多线程之NSOperation和GCD
- iOS学习之——多线程编程
- iOS中的UI数据持久化，沙盒
- TextField
- 【springmvc+mybatis项目实战】杰信商贸-9.生产厂家删除+查看
- CKEditor配置以及上传图片附件
- homerHEVC代码阅读（21）——基本流程
- iOS学习之路--多线程
- leecode第9题
- 【springmvc+mybatis项目实战】杰信商贸-10.生产厂家停用+启用
- #import与@class的区别
- 计算机技术领域当前的的主流技术及其社会需求调查报告
- 【springmvc+mybatis项目实战】杰信商贸-11.购销合同业务
- 平衡
- 笔记二十一（综合运用——飞船）
- 对内存溢出查看heapdump文件
