如何在ibooks等其他应用程序上打开pdf

Question

我使用UIDocumentinteractioncontroller在ibook等其他应用上打开pdf。

但是很难找到关于它的文档。

现在我可以部分展示开放。但是当我点击ibooks的图标时。什么都没发生。

我是否需要在委托中执行某些操作，例如documentInteractionController：willBeginSendingToApplication：???

Answer 1

首先你必须在你的.h文件中添加UIDocumentInteractionControllerDelegate

即：

@interface MyDocumentViewController : UIViewController <UIDocumentInteractionControllerDelegate> 

在你的.m文件中添加协议，这样你就可以找到，发生了什么......

- (void)documentInteractionController:(UIDocumentInteractionController *)controller willBeginSendingToApplication:(NSString *)application{
    NSLog(@"Send to App %@  ...", application);   
}

- (void)documentInteractionController:(UIDocumentInteractionController *)controller didEndSendingToApplication:(NSString *)application{
    NSLog(@"Finished sending to app %@  ...", application);   

}

- (void)documentInteractionControllerDidDismissOpenInMenu:(UIDocumentInteractionController *)controller{
    NSLog(@"Bye");   

}

当然，您必须将UIDocumentInteractionController的委托设置为此模块。我这样解决了：

-(BOOL)canOpenDocumentWithURL:(NSURL*)url inView:(UIView*)view {
    BOOL canOpen = NO;
    UIDocumentInteractionController* tmpDocController = [UIDocumentInteractionController 
                                                      interactionControllerWithURL:url];
    if (tmpDocController)
    {
        tmpDocController.delegate = self;
        canOpen = [tmpDocController presentOpenInMenuFromRect:CGRectZero
                                                    inView:self.view animated:NO];                   
        [tmpDocController dismissMenuAnimated:NO];
    }
    return canOpen;
}