神秘三函数

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{    // Return YES for supported orientations    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {        return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);    } else {        return YES;    }}- (BOOL)textViewShouldBeginEditing:(UITextView*)textView {[textView becomeFirstResponder];return YES;}- (BOOL)textViewShouldEndEditing:(UITextView*)textView {[textView resignFirstResponder];return YES;}