IOS 多線程/GCD
+ (SingleHandel *)shareModel
{
static dispatch_once_t onceQueue;
dispatch_once(&onceQueue, ^{
shareSingle = [[SingleHandel alloc] init];
});
return shareSingle;
}
/* //第一種線程開啟方式NSThread *thread1 = [[NSThread alloc] initWithTarget:self selector:@selector(threadAction) object:nil];
//給你的線程起個名字
thread1.name = @"thread1";
//啟動線程
[thread1 start];
//關閉
[thread1 cancel];*/
//第二種線程開啟方式(程序運行的時候自動開啟線程)
/*[NSThread detachNewThreadSelector:@selector(threadAction) toTarget:self withObject:nil];*/
//第三種繼承與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];
//創建隊列
NSOperationQueue *queue = [[NSOperationQueue alloc] init];
//設置最大同時執行數量
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----------------------------------------------------------------/
多線程---GCD
- (IBAction)buttonAction:(id)sender
{
//GCD(先進先出first in first out 簡稱FIFO)
//串行 前一個執行完成之後,後一個任務才能執行
//並行 任務在派發時時有序的,不用等到第一個任務執行完成才開始下一個(也就是一塊執行)
//GCD分為三種:主隊列,全局隊列,自定義隊列
/*--------------------主隊列(串行)----------------------*/
//使用主隊列實現任務派發(串行),在主線程中
/*dispatch_queue_t mainQueue = dispatch_get_main_queue();
//添加任務
dispatch_async(mainQueue, ^{
NSLog(@"第一個任務%@",[NSThread currentThread]);
});
dispatch_async(mainQueue, ^{
NSLog(@"第二個任務:%@",[NSThread currentThread]);
});
dispatch_async(mainQueue, ^{
NSLog(@"第三個任務:%@",[NSThread currentThread]);
});*/
/*--------------------自定義隊列(串行)----------------------*/
//自定義隊列
/* dispatch_queue_t myQueue = dispatch_queue_create("com.myqueue", DISPATCH_QUEUE_SERIAL);
//添加任務
dispatch_async(myQueue, ^{
NSLog(@"第一個任務%@",[NSThread currentThread]);
});
dispatch_async(myQueue, ^{
sleep(3);
NSLog(@"第二個任務:%@",[NSThread currentThread]);
});
dispatch_async(myQueue, ^{
NSLog(@"第三個任務:%@",[NSThread currentThread]);
});*/
/*--------------------自定義隊列(並行)----------------------*/
/* dispatch_queue_t myqueue1 = dispatch_queue_create("com.s", DISPATCH_QUEUE_CONCURRENT);
dispatch_async(myqueue1, ^{
NSLog(@"第一個任務%@",[NSThread currentThread]);
});
dispatch_async(myqueue1, ^{
//可以延時
sleep(3);
NSLog(@"第二個任務%@",[NSThread currentThread]);
});
dispatch_async(myqueue1, ^{
NSLog(@"第三個任務%@",[NSThread currentThread]);
});*/
/*--------------------全局隊列(並行)----------------------*/
/* dispatch_queue_t globalQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_async(globalQueue, ^{
sleep(2);
NSLog(@"第一個任務:%@",[NSThread currentThread]);
});
dispatch_async(globalQueue, ^{
NSLog(@"第二個任務:%@",[NSThread currentThread]);
});
dispatch_async(globalQueue, ^{
NSLog(@"第三個任務:%@",[NSThread currentThread]);
});*/
/*---------------------------------延時---------------------------------------------*/
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(4 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[self afther];
});
/*-----------------------------重復執行---------------------------------------------*/
dispatch_apply(3, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^(size_t t) {
[self afther];
});
/*-----------------------------執行一次---------------------------------------------*/
static dispatch_once_t onceQueue ;
dispatch_once(&onceQueue, ^{
NSLog(@"我就執行一次");
});
/*----------------------------------線程通訊---------------------------------*/
//遇到線程通訊,執行他的方法,可以回到主線程(如果正在執行子線程,走這個方法可以跳出子線程到主線程)
[NSThread detachNewThreadSelector:@selector(newThread) toTarget:self withObject:nil ];
}
- (void)newThread
{
NSLog(@"我是子線程");
//回到主線程
[self performSelectorOnMainThread:@selector(afther) withObject:self waitUntilDone:NO];
}
-(void)afther
{
NSLog(@"sad");
}
