ios - 调用 Objective-C 方法

Question

我将如何调用此方法，- (void)displayView:(UIView *)view arg:(UILabel *)label {
延迟 0.5 秒后？

我已经尝试过 [self performSelector:@selector(displayView:) withObject:view afterDelay:.5]; 但它只将 view 作为参数传递。

如何将两个参数传递给延迟 0.5 秒的方法？

Answer 1

使用延迟 block 调用:

主线程:

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.5 * NSEC_PER_SEC), dispatch_get_main_queue(), ^{
    [self displayView:view arg:label];
});

后台线程:

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 0.5 * NSEC_PER_SEC), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
    [self displayView:view arg:label];
});