@property (nonatomic,strong)UIDocumentInteractionController* document;
-(void)bPlayClick:(UIButton *)btn
{
NSString *docu = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES) lastObject];
NSString *filePath = [docu stringByAppendingPathComponent:@"1.pcm"];
NSURL *url = [NSURL fileURLWithPath:filePath];
self.document = [UIDocumentInteractionController interactionControllerWithURL:url];
[self.document presentOptionsMenuFromRect:self.view.bounds inView:self.view animated:YES];
}
from:http://blog.csdn.net/shxwork/article/details/50579836