iOS 多线程/GCD
+ (SingleHandel *)shareModel
{
static dispatch_once_t onceQueue;
dispatch_once(&onceQueue, ^{
shareSingle = [[SingleHandel alloc] init];
});
return shareSingle;
}
/* //第一种线程开启方式
NSThread *thread1 = [[NSThread alloc] initWithTarget:self selector:@selector(threadAction) object:nil];
//给你的线程起个名字
thread1.name = @"thread1";
//启动线程
[thread1 start];
//关闭
[thread1 cancel];*/
//第二种线程开启方式(程序运行的时候自动开启线程)
/*[NSThread detachNewThreadSelector:@selector(threadAction) toTarget:self withObject:nil];*/
//第三种继承与NSObjet
// [self performSelectorInBackground:@selector(threadAction) withObject:nil];
// NSOperation
NSInvocationOperation *inOp = [[NSInvocationOperation alloc] initWithTarget:self selector:@selector(invocation) object:nil];
NSBlockOperation *blockOp = [NSBlockOperation blockOperationWithBlock:^{
NSLog(@"我是block");
}];
// [blockOp start];
//创建队列
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
//设置最大同时执行数量
queue.maxConcurrentOperationCount = 1;
//添加事件
[queue addOperation:inOp];
// sleep(1);
[queue addOperation:blockOp];
}
- (void)invocation
{
// NSLog(@"%@",[NSThread currentThread]);
NSLog(@"我是方法");
}
/-----------------------------------------------------GCD----------------------------------------------------------------/
多线程---GCD
- (IBAction)buttonAction:(id)sender
{
//GCD(先进先出first in first out 简称FIFO)
//串行 前一个执行完成之后,后一个任务才能执行
//并行 任务在派发时时有序的,不用等到第一个任务执行完成才开始下一个(也就是一块执行)
//GCD分为三种:主队列,全局队列,自定义队列
/*--------------------主队列(串行)----------------------*/
//使用主队列实现任务派发(串行),在主线程中
/*dispatch_queue_t mainQueue = dispatch_get_main_queue();
//添加任务
dispatch_async(mainQueue, ^{
NSLog(@"第一个任务%@",[NSThread currentThread]);
});
dispatch_async(mainQueue, ^{
NSLog(@"第二个任务:%@",[NSThread currentThread]);
});
dispatch_async(mainQueue, ^{
NSLog(@"第三个任务:%@",[NSThread currentThread]);
});*/
/*--------------------自定义队列(串行)----------------------*/
//自定义队列
/* dispatch_queue_t myQueue = dispatch_queue_create("com.myqueue", DISPATCH_QUEUE_SERIAL);
//添加任务
dispatch_async(myQueue, ^{
NSLog(@"第一个任务%@",[NSThread currentThread]);
});
dispatch_async(myQueue, ^{
sleep(3);
NSLog(@"第二个任务:%@",[NSThread currentThread]);
});
dispatch_async(myQueue, ^{
NSLog(@"第三个任务:%@",[NSThread currentThread]);
});*/
/*--------------------自定义队列(并行)----------------------*/
/* dispatch_queue_t myqueue1 = dispatch_queue_create("com.s", DISPATCH_QUEUE_CONCURRENT);
dispatch_async(myqueue1, ^{
NSLog(@"第一个任务%@",[NSThread currentThread]);
});
dispatch_async(myqueue1, ^{
//可以延时
sleep(3);
NSLog(@"第二个任务%@",[NSThread currentThread]);
});
dispatch_async(myqueue1, ^{
NSLog(@"第三个任务%@",[NSThread currentThread]);
});*/
/*--------------------全局队列(并行)----------------------*/
/* dispatch_queue_t globalQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(globalQueue, ^{
sleep(2);
NSLog(@"第一个任务:%@",[NSThread currentThread]);
});
dispatch_async(globalQueue, ^{
NSLog(@"第二个任务:%@",[NSThread currentThread]);
});
dispatch_async(globalQueue, ^{
NSLog(@"第三个任务:%@",[NSThread currentThread]);
});*/
/*---------------------------------延时---------------------------------------------*/
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(4 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self afther];
});
/*-----------------------------重复执行---------------------------------------------*/
dispatch_apply(3, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(size_t t) {
[self afther];
});
/*-----------------------------执行一次---------------------------------------------*/
static dispatch_once_t onceQueue ;
dispatch_once(&onceQueue, ^{
NSLog(@"我就执行一次");
});
/*----------------------------------线程通讯---------------------------------*/
//遇到线程通讯,执行他的方法,可以回到主线程(如果正在执行子线程,走这个方法可以跳出子线程到主线程)
[NSThread detachNewThreadSelector:@selector(newThread) toTarget:self withObject:nil ];
}
- (void)newThread
{
NSLog(@"我是子线程");
//回到主线程
[self performSelectorOnMainThread:@selector(afther) withObject:self waitUntilDone:NO];
}
-(void)afther
{
NSLog(@"sad");
}
