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下载文件 ,调用系统的方法(UIDocumentInteractionController) 查看

1.首先我们如果要做这个效果就要知道这个(UIDocumentInteractionController)

_docController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0] stringByAppendingPathComponent:@"123.xls"]]];

_docController.delegate = self;

[_docController presentOpenInMenuFromRect:CGRectMake(760, 20, 100, 100) inView:self.view animated:YES];

2.重中之重我们要把他的代理写上,要不然会把你崩的细碎的,哈哈

- (UIViewController *)documentInteractionControllerViewControllerForPreview:(UIDocumentInteractionController *)controller

{

return self;

}

- (UIView *)documentInteractionControllerViewForPreview:(UIDocumentInteractionController *)controller

{

return self.view;

}

- (CGRect)documentInteractionControllerRectForPreview:(UIDocumentInteractionController *)controller

{

return  self.view.frame;

}

3.如果完成了这2步基本了然了,但是还有记得自己去把代里协议 写上啊

算了还是我也给你写了吧。。。

<UIDocumentInteractionControllerDelegate>

@property(nonatomic,retain)UIDocumentInteractionController *docController;

4.完成了黄金三步 还不成功。

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