How can I fade a UIView in while moving it up? - objective-c

Question

I have a UIView and I want to give it an effect that causes it to start with an alpha of 0 and then while moving up 50 pixels animated it also changes to an alpha of 1. How can this be done in Objective-C?

Answer 1

[UIView animateWithDuration:1.0 animations:^{
//here change position and alpha
CGRect newFrame = view.frame;
newFrame.origin.y += 50;
view.frame = newFrame;
view.alpha = 1.0;
} completion:^(BOOL finished) {
//called when animation did finish. do what you want
}];

Answer 2

https://developer.apple.com/library/ios/documentation/windowsviews/conceptual/viewpg_iphoneos/animatingviews/animatingviews.html
Everything about animations.
It's all right there.
//something similar to what you want:
- (IBAction)showHideView:(id)sender
{
// Fade out the view right away
[UIView animateWithDuration:1.0
delay: 0.0
options: UIViewAnimationOptionCurveEaseIn
animations:^{
thirdView.alpha = 0.0;
}
completion:^(BOOL finished){
// Wait one second and then fade in the view
[UIView animateWithDuration:1.0
delay: 1.0
options:UIViewAnimationOptionCurveEaseOut
animations:^{
thirdView.alpha = 1.0;
}
completion:nil];
}];
}

Answer 3

Something like this would do the trick:
UIView *box = [[UIView alloc] initWithFrame:CGRectMake(self.view.center.x, self.view.center.y, 100, 50)];
box.backgroundColor = [UIColor blackColor];
box.alpha = 0.0f;
[self.view addSubview:box];
[UIView animateWithDuration:2.0f
animations:^{
box.alpha = 1.0f;
CGRect frame = CGRectMake(self.view.center.x, self.view.center.y - 100, 100, 50);
[box setFrame:frame];
}];