iOS多线程技术

来源：互联网发布：apache linux ab 工具编辑：程序博客网时间：2024/05/17 09:10

1. NSObject多线程

[selfperformSelectorInBackground:@selector(intoBackground)withObject:nil];

[selfperformSelectorOnMainThread:@selector(intoForword)withObject:nilwaitUntilDone:YES];

2. NSThread多线程

创建子线程

1.[NSThread detachNewThreadSelector:@selector(intoBackThread:) toTarget:self withObject:imageView];

2. NSThread *thread =[[NSThreadalloc] initWithTarget:self selector:@selector(intoBackThread:)object:imageView];

[threadstart];

在子线程中进行的操作需要autoreleasepool

@autoreleasepool{}

回到主线程

[imageView performSelectorOnMainThread:@selector(setImage:)withObject:image waitUntilDone:YES];

3. NSOperation多线程

1.

// 利用队列设置同时并发的线程个数

[self.queuesetMaxConcurrentOperationCount:4];

for (UIImageView *imageViewin self.dataArray) {

NSInvocationOperation *operation = [[NSInvocationOperationalloc] initWithTarget:selfselector:@selector(operationCilck:)object:imageView];

// 队列(一定要记住)

[self.queueaddOperation:operation];

}

2.

@autoreleasepool {

[self.queuesetMaxConcurrentOperationCount:4];

for (UIImageView *imageViewin self.dataArray) {

NSBlockOperation *blockOperation = [NSBlockOperationblockOperationWithBlock:^{

[NSThreadsleepForTimeInterval:1.0f];

// 在线程中作多线程加载资源

UIImage *image = [UIImageimageNamed:[NSStringstringWithFormat:@"NatGeo%02ld.png",(long)arc4random_uniform(17) + 1]];

// 得到UI线程

[[NSOperationQueuemainQueue] addOperationWithBlock:^{

[imageViewsetImage:image];

}];

[self.queueaddOperation:blockOperation];

}

在子线程中进行的操作需要autoreleasepool

回到主线程

[imageView performSelectorOnMainThread:@selector(setImage:) withObject:image waitUntilDone:YES];

4. GCD多线程

// 队列初始化(全局队列)

dispatch_queue_t queue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);

// 同步:一步一步做异步:同时做

for (UIImageView *imageViewin self.dataArray) {

// 进入多线程

dispatch_async(queue, ^{

NSLog(@"%@",[NSThreadcurrentThread]);

UIImage *image = [UIImageimageNamed:[NSStringstringWithFormat:@"NatGeo%02ld.png",(long)arc4random_uniform(17) + 1]];

dispatch_async(dispatch_get_main_queue(), ^{

[imageViewsetImage:image];

});

}

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