ios - iOS SDK getting clipboard text on application load

Question

I would like to get the text copied to clipboard when application launching.

I can use following text to get the available text from clipboard. But I need to use this value in a different viewcontroller. How can I pass this value to my viewcontroller?

- (void)applicationDidBecomeActive:(UIApplication *)application {

    NSLog([UIPasteboard generalPasteboard].string);

}

Answer 1

更好的处理方法是为 UIApplicationDidBecomeActiveNotification 事件添加一个观察者（在视图控制器中）。这样可以避免应用程序委托和视图控制器之间不必要的耦合。

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(getClipboardString:)
                                             name:UIApplicationDidBecomeActiveNotification object:nil];

编辑：当视图控制器被移除时，不要忘记移除观察者：

[[NSNotificationCenter defaultCenter] removeObserver:self];

Answer 2

在您的 VC 上声明并实现一个方法，您可以在激活时从应用程序委托调用该方法：

@inferface ViewController: UIViewController {
   /* etc. */
}

- (void)handlePasteboardString:(NSString *)s;

@end

在您的应用委托中：

- (void)applicationDidBecomeActive:(UIApplication *)a
{
    [self.mainViewController handlePasteboardString:[UIPasteboard generalPasteboard].string];
}

Answer 3

不确定何时需要剪贴板项目，但如果是在显示或即将显示特定视图控制器时，您可以在viewDidLoad该视图控制器中执行此操作