如何在一行代码中编写`performSelectorInBackground：afterDelay：`？

Question

performSelectorInBackground:中有方法performSelector: afterDelay:和NSObject。如何在一行代码中组合它们？ 也许以某种方式NSTimer？

Answer 1

您是否考虑过使用块？

double delayInSeconds = 2.0;
dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
dispatch_after(popTime, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0),
^(void){
    //your code here
});

另外，如果写作太多，那么已经有了它的片段，开始输入＆＃34; dispatch_after＆＃34;而且你会看到它。

Answer 2

NSTimer

[NSTimer scheduledTimerWithTimeInterval:2.0
target:self
selector:@selector(targetMethod:)
userInfo:nil
repeats:NO];