How to add an animation in adding a view? - iphone

Question

I have an application in which I had a button on the navigationbar.
When clicking on that I need to add a subview to the self.view.
DemoViewController *demoViewController1 = [[DemoViewController alloc] initWithNibName:#"DemoViewController" bundle:nil];
CGRect frame=demoViewController1.view.frame;
frame.origin.y = -300;
[self.view addSubview:demoViewController1.view];
[UIView animateWithDuration:0.5
animations:^{
CGRect frame1 = frame;
frame1.origin.y = 0;
demoViewController1.view.frame = frame1;
}];
I was tried by setting the frame origin y of the adding view(it is of another view controller).to some negetive value and by clicking bring it to 0.but it doesnt have that drop down effect.
I need to add the view with an animation like drop down view. and when pressed again on the button need to remove also like this.
Can anybody help me on this?

Answer 1

You add the view as subview with a frame that is not on the screen (e.g. negative y coordinate) and modify the frame animated:
MyView *myView = [[MyView alloc] initWithFrame:CGRectMake(50, -200, 200, 200)];
[self.view addSubview:myView];
[UIView animateWithDuration:0.3
animations:^{
CGRect frame = myView.frame;
frame.origin.y = 0;
myView.frame = frame;
}];
And the code for removal:
[UIView animateWithDuration:0.3
animations:^{
CGRect frame = myView.frame;
frame.origin.y = -1 * frame.size.height;
myView.frame = frame;
}
completion:^(BOOL finished) {
[myView removeFromSuperview];
}];
Edit:
Replace your code with this:
DemoViewController *demoViewController1 = [[DemoViewController alloc] initWithNibName:#"DemoViewController" bundle:nil];
CGRect frame=demoViewController1.view.frame;
frame.origin.y = -300;
demoViewController1.view.frame = frame; // You forgot this line
[self.view addSubview:demoViewController1.view];
[UIView animateWithDuration:0.5
animations:^{
CGRect frame1 = demoViewController1.view.frame;
frame1.origin.y = 0;
demoViewController1.view.frame = frame1;
}];

Answer 2

First keep ur view at bottom.
when it's clicked first time
do this
[UIView animateWithDuration:0.3 animations:^{
//keep points that's in a screen
self.view.center = CGPointMake(x,y,width,height);
}];
when it's clicked second time
give points below the visible screen
[UIView animateWithDuration:0.3 animations:^{
//keep points that's in a screen
self.view.center = CGPointMake(x,y,width,height);
}];
Let me know if you find a better way than this.

Answer 3

[self.yourView setFrame:setYourInitialFrame];
[UIView animateWithDuration: 1.00 animations:^{
[self.yourView setFrame:setYourFinalFrame];
}];