Create UILabel on any view controller from a method - iphone

Question

I have a method that gets called if a video upload to Facebook has failed. If that method is called then I would like for a UILabel to briefly appear in any view controller that a user happens to be on at the time the upload fails.
Is this possible?
I asked a similar question earlier about a UIAlertView, but I realized that there are certain circumstances under which an alert could negatively impact user experience.

Answer 1

You can do this is many ways -
1) you can add UILabel to your applications main Window.
2) if you are using a UINavigationController then you get the instance of current viewcontroller and then can add UILabel to its view.
3) if you are using a UITabBarController in this case you can also get the instance of current viewcontroller by accessing tabBarController's selected viewcontroller.

Answer 2

this code Im posting below is from HackBook sample app from facebook. they done similar to what you want.
- (void)showMessage:(NSString *)message {
CGRect labelFrame = messageView.frame;
labelFrame.origin.y = [UIScreen mainScreen].bounds.size.height - self.navigationController.navigationBar.frame.size.height - 20;
messageView.frame = labelFrame;
messageLabel.text = message;
messageView.hidden = NO;
// Use animation to show the message from the bottom then
// hide it.
[UIView animateWithDuration:0.5
delay:1.0
options: UIViewAnimationCurveEaseOut
animations:^{
CGRect labelFrame = messageView.frame;
labelFrame.origin.y -= labelFrame.size.height;
messageView.frame = labelFrame;
}
completion:^(BOOL finished){
if (finished) {
[UIView animateWithDuration:0.5
delay:3.0
options: UIViewAnimationCurveEaseOut
animations:^{
CGRect labelFrame = messageView.frame;
labelFrame.origin.y += messageView.frame.size.height;
// UIView *messageView; declared in header
messageView.frame = labelFrame;
}
completion:^(BOOL finished){
if (finished) {
messageView.hidden = YES;
messageLabel.text = #"";
}
}];
}
}];
}