ios - 使用选择器和 NSSelectorFromString 向对象发送消息

Question

下面会通过respondsToSelector测试，但是SIGABRT在实际调用[viewController selector]或者[viewController action :选择器]。堆栈跟踪状态为“NSInvalidArgumentException，原因:-[MyViewController 选择器]:无法识别的选择器”。

[viewController @selector(selector)] 会导致编译错误(错误:'selector' 前应为 ':')。

When the selector is hard coded, all works well.

如何通过选择器向对象发送消息？

-(void) notifyViewControllers:(NSString*) message
{
    if(!message) return;

    SEL selector = NSSelectorFromString(message);
    if(!selector) return;

    NSArray* viewControllers = [self.tabBarController viewControllers];
    if(!viewControllers) return;

    for (UIViewController* viewController in viewControllers)
    {
        if(!viewController) continue;

        if ([viewController respondsToSelector:selector]) {
            // [viewController selector];
            [viewController action:selector];
        }
    }
}

Answer 1

[self performSelector:@selector(notifyViewControllers:) withObject: message];