ios中多线程GCD NSOperation NSThread 相关的操作解析

//1、GCD 继承自C语言优点简单方便

//开启一个子线程处理耗时的操作

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

//在主线程处理UI更新相关的操作

dispatch_async(dispatch_get_main_queue(), ^{

});

//延时操作

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(10 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

});

//确保程序只会运行一次,类似于锁

static dispatch_once_t onceToken;

dispatch_once(&onceToken, ^{

});

//确保程序只会运行一次

@synchronized (self) {

}

// 2、NSOperation NSOperationQueue 是对GCD更高一层的封装可以添加依赖和设置优先级更好的控制和管理线程的并发操作缺点:操作比GCD稍慢

NSBlockOperation *block=[NSBlockOperation blockOperationWithBlock:^{

}];

NSInvocationOperation *invo=[[NSInvocationOperation alloc]initWithTarget:self selector:@selector(btnOperate) object:nil];

NSOperationQueue *queue=[[NSOperationQueue alloc]init];

//添加依赖，设置操作

[block addDependency:invo];

//设置操作优先级

block.queuePriority=NSOperationQueuePriorityLow;

invo.queuePriority=NSOperationQueuePriorityHigh;

[queue addOperation:block];

[queue addOperation:invo];

//3、NSThread 是一种轻量级的需要管理线程的生命周期和并发操作

NSThread *thread=[[NSThread alloc]initWithTarget:self selector:@selector(addBtnTypeCss:) object:nil];

//线程的开启

[thread start];

//线程的取消

[thread cancel];

//等到某个日期

[NSThread sleepUntilDate:[NSDate date]];

//设置等待多久唤起

[NSThread sleepForTimeInterval:1];

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