/**
*创建一个队列(串行)
**/
dispatch_queue_t queue1 = dispatch_queue_create("queue1", DISPATCH_QUEUE_SERIAL);
/**
*添加代码块 执行线程的路径
**/
dispatch_async(queue1, ^{
for (int i = 0; i<100; i++) {
NSLog(@"线程一,%d",i);
}
});
用C语言函数的方式创建线程
dispatch_sync_f(queue1, NULL, treadFun);//用线程函数的方式作为线程的路径
void treadFun(){
for (int i =0 ; i<100; i++) {
NSLog(@"线程2,%d",i);
}
}
// dispatch_time_t time = dispatch_time(DISPATCH_TIME_NOW, 2*NSEC_PER_SEC);
// dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
// dispatch_after(time, queue, ^{
// NSLog(@"222");
// });
上面代码等价于
NSLog(@"11111");
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
NSLog(@"2222222");
});
/**
*过一段时间后才执行
1,dispatch_after
2,NSObject performSelector
3,timer 定时器方法
**/
[super viewDidLoad];
NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:5.0 target:self selector:@selector(myfun) userInfo:nil repeats:YES];
[timer invalidate];
// [self performSelector:@selector(myfun) withObject:nil afterDelay:5.0];