I know about UIView:tranisitionFromView:ToView with the option for UIViewAnimationOptionTransitionCrossDissolve
but I have a view that is added to a view hierarchy and alpha = 0;
I want to set alpha = 1 in an animated manner using the cross dissolve effect
How can I achieve this? I am not replacing any views in the hierarchy and therefor the first method isn't relevant
Use UIView's animateWithDuration:animations: method
set alpha relatively if you want to hide or show inside the animations: block
[UIView animateWithDuration:0.5 animations:^{
view.alpha = 1;
} completion:nil];
Also, when hiding the view, maybe you would want to remove it from super view in the completion block.
Related
I am trying to create a sliding menu (like the one in google maps app) in which menu screen should be shown or added as subview over the existing screen on tapping a button. While showing it, the sub view should be animated from left to right. I tried to animate while adding it as subview, but failed in doing so. Can any one suggest how to do it? (or) Can I do it using navigation controller?
Thanks in advance!!
You need to add the subview, and set it's frame out of the screen.(320,0,100,568 for example).
Of course it's better to use auto layout for that.
Add as subview:
[self.view addSubView:sideMenu];
When you want to show it, just change it's frame using animation block.
[UIView animateWithDuration:0.2 delay:0.1 options:UIViewAnimationOptionCurveEaseInOut animations:^{
sideMenu.frame = CGRectMake(220,0,100,568);
} completion:^(BOOL finished) {
}];
As I said, it's better to use auto layout and not setting frames. I did it only for the example.
I am trying to make a UITableView appear when a user taps on a button and disappear when the button is re-tapped.
I implemented the following code but nothing seems to appear when I tap the button.
- (IBAction)dropDown:(UIButton *)sender
{
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.6];
CGAffineTransform transfrom = CGAffineTransformMakeTranslation(0, 200);
self.markersTableView.transform = transfrom;
self.markersTableView.alpha = self.markersTableView.alpha * (-1) + 1;
[UIView commitAnimations];
}
What may potentially be the issue?
EDIT:
I was able to make the UITableView appear and disappear by adding self.markersTableView.hidden = YES; in viewDidLoad() and self.markersTableView.hidden = NO; in the IBAction method.
However, the table view disappears when I initially tap on the button as shown in the screenshot:
The fading of the rows is an indication it is moving down the screen, and then it disappears.
It only reappears when I re-tap on the UIButton the 2nd time.
Any clues?
Don't use a transform on your table view. That will make it LOOK like it's in a different position, but it won't respond to taps correctly.
Instead, use the newer UIView block-based animation methods and change the view's center.
The code might look like this (if you're NOT using auto-layout)
[UIView AnimateWithDuration: .2
animations: ^
{
CGPoint center = self.markersTableView.center;
center.y += 200;
self.markersTableView.center = center;
}
];
If you're using auto-layout, though, that won't work and you will need to animate the view's position using constraints.
From memory, here's an outline of how to do auto-layout based animations: You would create a vertical position constraint on your table view and connect the constraint to an IBOutlet in your view controller. In your animation code you change the constant of the constraint (the vertical position) and then in the animation block, send the view a needsLayout message.
I have a UIView "MainView" that initially appears as follows:
The gradient bar is part of MainView, the whitespace beneath is part of a Container View subview.
When the search button in top-right is tapped, I animate a searchBar from offscreen to be visible in the view:
I manage to do this by the following code:
CGRect currentViewFrame = self.view.bounds;
currentViewFrame.origin.y += searchViewHeight;
[UIView animateWithDuration:0.4
delay:0.0
usingSpringWithDamping:1.0
initialSpringVelocity:4.0
options:UIViewAnimationOptionCurveEaseInOut animations:^{
self.view.frame = currentViewFrame;
}
completion:^(BOOL finished)
{
}];
Visually, the result of this animation is perfect. The entire view shifts, and the searchBar is now on screen. However, the searchBar does not respond to interaction. Correct me if I'm wrong, but I expect this is because the MainView's frame no longer includes the screen area that the searchBar now occupies, so its effectively a gesture deadzone.
So this makes me think that instead of lazily animating the entire MainView down to accomodate the searchBar, I must instead individually translate all subviews of MainView one at a time. In this simple situation, that would not be a big problem, but I can envision a circumstance with tens of subviews making that completely unrealistic.
What is the best method to accomplish what I am trying to do? Is there a secret to animating entire views/subviews without having gesture deadzones? Thanks in advance!!
I want to make a UIView animate when it's being closed. I tried reading the following:
http://felipe.sabino.me/ios/2012/05/10/ios-uiview-transition-effects/
iPhone UIView Animation Best Practice
iOS UIView Animation CATransform3DMakeRotation confusion
However, I'd like to make it transition from the side of the screen, as per the image in the Google Chrome app.
Is there another animation that is set for this? I was not able to find it... I'm assuming it has to do with animateWithDuration or a CATransform...can somebody point me in the right direction for this?
[EDIT]
I used the below post for an answer as well as this post:
Setting a rotation transformation to a UIView or its layer doesn't seem to work?
I was able to add multiple animations as per below:
[UIView animateWithDuration: .2
delay: 0
options: (UIViewAnimationOptionCurveLinear | UIViewAnimationOptionAllowUserInteraction)
animations:^{self.view.center = CGPointMake(self.view.frame.origin.x * 3, self.view.frame.origin.y * 2), self.view.transform = CGAffineTransformMakeRotation(M_PI_4/2);}
completion:nil];
Previously I was not aware you can add multiple animations so easily. That adds rotation as well as the linear movement together.
Animate your view so it moves offscreen/shrinks/expands/fades, then do the actual removal when the animation ends.
You can do this by altering the properties of the view (position/size/offset) between a beginAnimations/commitAnimations block. UIKit will then animate these properties over the time specified.
E.g something like;
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.30f];
view.transform =
CGAffineTransformMakeTranslation(
view.frame.origin.x,
480.0f + (view.frame.size.height/2) // move the whole view offscreen
);
background.alpha = 0; // also fade to transparent
[UIView commitAnimations];
In the animation end notification you can then remove the view.
I've never run Chrome on iOS, so I have to try to guess what your screenshot is showing.
Does the animation go off the screen while shrinking and turning to one side?
And do you mean you want to animate a UIViewController, or a UIView? Are you closing a view controller?
If it's a view controller, how are you managing your view controllers? Are you using a navigation controller, or are you presenting a set of modal view controllers, or some other method?
I've got a custom alert dialog based on TSAlertView (https://github.com/TomSwift/TSAlertView)
However when it gets displayed its appearance is very sudden and jarring, I tried adding some animation to it using the following code however it makes no difference (the following code has no effect at all, I could change the duration to N seconds or change the animation style to anything and it has no impact):
[UIView transitionWithView:self.view
duration: 0.5
options: UIViewAnimationOptionCurveEaseIn
animations:^ { [self.view addSubview:dialog]; }
completion:nil];
Instead of adding the alert view as a subview in the animations block try changing it's alpha value. When you create the the AlertView set the alpha to zero and add it as a subview. Then, in the animation block, change the alpha value to one.
Hope this helps!