objective-c - 如何更改 Apple 示例代码项目 MoviePlayer

Question

在 Apple 示例代码项目：MoviePlayer中，我想实现，当示例 App 启动时，本地视频会立即以编程方式播放。

我添加最后两句话：

[self.tabBarController setSelectedIndex:1];
[self performSelector:@selector(playMovieButtonPressed:) withObject:tabBarController.selectedViewController afterDelay:0.0];

在下面的函数中：

- (void)applicationDidFinishLaunching:(UIApplication *)application
{
    /* Override point for customization after app. launch. */

    /* Add the tab bar controller's current view as a subview of the window. */
    [window addSubview:tabBarController.view];
    [window makeKeyAndVisible]; 
    [self.tabBarController setSelectedIndex:1];
    [self performSelector:@selector(playMovieButtonPressed:) withObject:tabBarController.selectedViewController afterDelay:0.0];
}

但得到以下错误：

由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因：“-[MyLocalMovieViewController playMovieButtonPressed]：无法识别的选择器发送到实例 0x6190330”

请帮忙，谢谢！

Answer 1

您需要获得指向您的指针，MyLocalMovieViewController然后执行类似的操作

[pointer playMovieButtonPressed:nil]