OC中创建线程的方法
如果指定在主线程中执行代码，如何延时执行代码
-
1.创建线程的方法
- NSThread
- NSOperationQueue、NSOperation
- GCD
2.在主线程中执行代码
[self performSelector: onThread:[NSThread mainThread] withObject: waitUntilDone:];
dispatch_async(dispatch_get_main_queue(), ^{});
- 3.延时执行
double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW,
(int64_t)(delayInSeconds * NSEC_PER_SEC));
dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
});
[self performSelector: withObject: afterDelay:];
[NSTimer scheduledTimerWithTimeInterval: target: selector: userInfo: repeats:];
