GCD

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#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

[superviewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning {

[superdidReceiveMemoryWarning];

// Dispose of any resources that can be recreated.

}

#pragma mark --多线程之 NSThread

- (IBAction)NSThreadButton:(UIButton *)sender

{

// 自定义多线程

NSThread *thread = [[NSThreadalloc] initWithTarget:selfselector:@selector(action:)object:@"大水贝"];

// 开启多线程

[threadstart];

// 使用系统的

[NSThreaddetachNewThreadSelector:@selector(downloadImage)toTarget:selfwithObject:nil];

NSLog(@"当前线程为 %@是否是主线程 %d", [NSThreadcurrentThread], [NSThreadisMainThread]);

}

- (void)downloadImage

{

NSString *urlStr =@"http://amuse.nen.com.cn/imagelist/11/21/9as70n3ir61b.jpg";

NSURL *url = [NSURLURLWithString:urlStr];

NSData *data = [NSDatadataWithContentsOfURL:url];

self.NSThreadImageView.image = [UIImageimageWithData:data];

}

- (void)action:(NSString *)str

{

NSLog(@"当前线程为 %@是否是主线程 %d", [NSThreadcurrentThread], [NSThreadisMainThread]);

NSLog(@"str = %@", str);

}

#pragma mark --多线程之 NSOperation

- (IBAction)NSOperation:(UIButton *)sender

{

// NSOperation 是抽象类, 我们用它提供的两个子类

//NSInvocationOperation 创建的一个对象就是一个任务

NSInvocationOperation *operation = [[NSInvocationOperationalloc] initWithTarget:selfselector:@selector(action:)object:@"大水表"];

NSInvocationOperation *operation1 = [[NSInvocationOperationalloc] initWithTarget:selfselector:@selector(action1)object:nil];

NSBlockOperation *blockOperation = [NSBlockOperationblockOperationWithBlock:^{

// for (int i = 0; i < 100; i++) {

// NSLog(@"i = %d", i);

// }

}];

//队列用来管理队列里的一个或者多个任务

NSOperationQueue *queue = [[NSOperationQueuealloc] init];

//最大允许并发执行任务的个数

[queue setMaxConcurrentOperationCount:2];

//绑定一个任务, 就是前者必须等后者执行完才能执行

[operationaddDependency:blockOperation];

//将任务加入到队列中

[queueaddOperation:operation];

[queueaddOperation:operation1];

[queueaddOperation:blockOperation];

}

- (void)action1

{

NSLog(@"action1");

}

#pragma mark --GCD之串行 serial

- (IBAction)GCDButton:(UIButton *)sender

{

//串行特点一个一个执行,一个执行完再执行下一个

// 1.系统自带串行队列

// 创建系统主队列

#warning 重点经常用到,作用从子线程上得到主线程

// dispatch_queue_t mainQueue = dispatch_get_main_queue();

// //1.2 执行主队列

// dispatch_async(mainQueue, ^{

// NSLog(@"1 = %@ %d", [NSThread currentThread], [NSThread isMainThread]);

// NSLog(@"2 = %@ %d", [NSThread currentThread], [NSThread isMainThread]);

// NSLog(@"3 = %@ %d", [NSThread currentThread], [NSThread isMainThread]);

// });

#warning 重要非常常见的写法

// dispatch_async(dispatch_get_main_queue(), ^{

// NSLog(@"获得主线程的大众写法");

// });

// // 2.自定义串行队列

// // 2.1 创建自定义串行队列

// // 参数1:队列标示符一般是逆向域名

// // 参数2: 队列类型

// dispatch_queue_t mySerialQueue = dispatch_queue_create("com.lanou3g.GCD.Serial", DISPATCH_QUEUE_SERIAL);

// // 2.2 执行队列

// dispatch_async(mySerialQueue, ^{

// NSLog(@"1 = %@ %d", [NSThread currentThread], [NSThread isMainThread]);

// NSLog(@"2 = %@ %d", [NSThread currentThread], [NSThread isMainThread]);

// NSLog(@"3 = %@ %d", [NSThread currentThread], [NSThread isMainThread]);

// NSLog(@"4 = %@ %d", [NSThread currentThread], [NSThread isMainThread]);

// });

#pragma mark --GCD之并行

#warning 重要经常跟dispatch_get_main_queue 一起使用

// // 1.得到全局队列

// // 参数1.队列优先级

// // 参数2.苹果预留参数,默认给0

// dispatch_queue_t globalQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

// // 2.执行队列

// dispatch_async(globalQueue, ^{

// NSLog(@"1 = %@ %d", [NSThread currentThread], [NSThread isMainThread]);

// });

// dispatch_async(globalQueue, ^{

// NSLog(@"2 = %@ %d", [NSThread currentThread], [NSThread isMainThread]);

// });

// 自定义并行队列

//创建自定义并行队列

// dispatch_queue_t myCyurrentQueue = dispatch_queue_create("com.lanou3g.GCD.ConcurrentQueue", DISPATCH_QUEUE_CONCURRENT);

// // 2.执行并行队列