//get path to file you want to open
NSString *fileToOpen = [[NSBundle mainBundle] pathForResource:@"readme" ofType:@"pdf"];
//create NSURL to that path
NSURL *url = [NSURL fileURLWithPath:fileToOpen];
//use the UIDocInteractionController API to get list of devices that support the file type
docController = [UIDocumentInteractionController interactionControllerWithURL:url];
[docController retain];
//present a drop down list of the apps that support the file type, click an item in the list will open that app while passing in the file.
BOOL isValid = [docController presentOpenInMenuFromRect:CGRectZero inView:self.view animated:YES];
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…