ios开发开启多线程的几种基本方法

来源：互联网发布：php销售管理系统编辑：程序博客网时间：2024/06/05 02:30

// 1.第一种开启新的线程调用mutableThread

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

[t start]; // 需手动开启

// 2.第二种开启新的线程调用mutableThread

[NSThread detachNewThreadSelector:@selector(mutableThread) toTarget:self withObject:nil];

// 3.第三种开启新的线程调用mutableThread

[self performSelectorInBackground:@selector(mutableThread) withObject:nil];

// 4.block语法启动一个线程

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

[threadQueue addOperationWithBlock:^(void){

NSThread *t = [NSThread currentThread];

if (![t isMainThread]){

NSLog(@"是多线程”);

}

}];

// 5.NSOperation开启一个线程

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

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

[threadQueue addOperation:op];

// 在主线程上调用reloadData 方法 (从子线程跳到主线程)

[self performSelectorOnMainThread:@selector(reloadData) withObject:nil waitUntilDone:YES];

PS：不要在子线程reloadData,要跳到主线程

// GCD:Grand central dispatch (C语言的)

dispatch_queue_t queue = dispatch_queue_create(“test”, NULL);

dispatch_async(queue, ^{

for (int i = 0; i < 50; i++)

{

NSLog(@“多线程:%d”, i);

}

// 回到主线程

dispatch_sync(dispatch_get_main_queue, ^{

})

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