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最大并发数
最大并发数
// 1.创建一个队列（非主队列）
NSOperationQueue *queue = [[NSOperationQueuealloc]init];// 2.设置最大并发(最多同时并发执行3个任务)
queue.maxConcurrentOperationCount= 3;
// 3.添加操作到队列中（自动异步执行任务，并发）
NSBlockOperation *operation1 = [NSBlockOperationblockOperationWithBlock:^{
NSLog(@"下载图片1---%@", [NSThread currentThread]);
}];
NSBlockOperation *operation2 = [NSBlockOperationblockOperationWithBlock:^{
NSLog(@"下载图片2---%@", [NSThread currentThread]);
}];
NSBlockOperation *operation3 = [NSBlockOperationblockOperationWithBlock:^{
NSLog(@"下载图片3---%@", [NSThread currentThread]);
}];
NSBlockOperation *operation4 = [NSBlockOperationblockOperationWithBlock:^{
NSLog(@"下载图片4---%@", [NSThread currentThread]);
}];
NSInvocationOperation *operation5 = [[NSInvocationOperationalloc]initWithTarget:selfselector:@selector(download)object:nil];
[queue addOperation:operation1];
[queue addOperation:operation2];
[queue addOperation:operation3];
[queue addOperation:operation4];
[queue addOperation:operation5];
[queue addOperationWithBlock:^{
NSLog(@"下载图片5---%@", [NSThread currentThread]);
}];
[queue addOperationWithBlock:^{
NSLog(@"下载图片6---%@", [NSThread currentThread]);
}];
[queue addOperationWithBlock:^{
NSLog(@"下载图片7---%@", [NSThread currentThread]);
}];
[queue addOperationWithBlock:^{
NSLog(@"下载图片8---%@", [NSThread currentThread]);
}];
[queue addOperationWithBlock:^{
NSLog(@"下载图片9---%@", [NSThread currentThread]);
}];
[queue cancelAllOperations];
最大并发数
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