How to Use the Default iOS7 Uianimation Curve

How to use the default iOS7 UIAnimation curve

Here's how I do it (at least when the keyboard is about to be shown)

- (void)keyboardWillShow:(NSNotification *)notification {
    NSDictionary *keyboardAnimationDetail = [notification userInfo];
    UIViewAnimationCurve animationCurve = [keyboardAnimationDetail[UIKeyboardAnimationCurveUserInfoKey] integerValue];
    CGFloat duration = [keyboardAnimationDetail[UIKeyboardAnimationDurationUserInfoKey] floatValue];

    [UIView animateWithDuration:duration delay:0.0 options:(animationCurve << 16) animations:^{
        // Set the new properties to be animated here
    } completion:nil];
}

You get the animation curve from the keyboard notification as usual and translate it to an animation option by bit-shifting it.

iOS 7 - Keyboard animation

Now I found the solution. The animation starts from the point {0, 920} to {0, 352}. The problem was that the UITableView object started with a size of {160, 568}, so I changed the size of the UITableView to {160, 920} before the animation was started.

Concerning to the unknown animation curve, I just set the parameter to animationCurve << 16 to convert it from a view animation curve to a view animation option.

The value is not equal to the linear, ease in, ease out and ease inout animation curve.

Here is my code:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(_keyboardWillShow:)
                                             name:UIKeyboardWillShowNotification
                                           object:nil];

and:

- (void)keyboardWillShow:(NSNotification *)aNotification {
    NSDictionary *userInfo = aNotification.userInfo;

    //
    // Get keyboard size.

    NSValue *beginFrameValue = userInfo[UIKeyboardFrameBeginUserInfoKey];
    CGRect keyboardBeginFrame = [self.view convertRect:beginFrameValue.CGRectValue fromView:nil];

    NSValue *endFrameValue = userInfo[UIKeyboardFrameEndUserInfoKey];
    CGRect keyboardEndFrame = [self.view convertRect:endFrameValue.CGRectValue fromView:nil];

    //
    // Get keyboard animation.

    NSNumber *durationValue = userInfo[UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval animationDuration = durationValue.doubleValue;

    NSNumber *curveValue = userInfo[UIKeyboardAnimationCurveUserInfoKey];
    UIViewAnimationCurve animationCurve = curveValue.intValue;

    //
    // Create animation.

    CGRect tableViewFrame = self.tableView.frame;
    bTableViewFrame.size.height = (keyboardBeginFrame.origin.y - tableViewFrame.origin.y);
    self.tableView.frame = tableViewFrame;

    void (^animations)() = ^() {
        CGRect tableViewFrame = self.tableView.frame;
        tableViewFrame.size.height = (keyboardEndFrame.origin.y - tableViewFrame.origin.y);
        self.tableView.frame = tableViewFrame;
    };

    //
    // Begin animation.

    [UIView animateWithDuration:animationDuration
                          delay:0.0
                        options:(animationCurve << 16)
                     animations:animations
                     completion:nil];
}

What is the animation speed of the keyboard appearing in iOS8?

You can get the animation duration and the animation curve from the userInfo dictionary on the keyboardWillShow: notifications.

First register for the notification

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

Then get the values from the notifications userInfo keys.

- (void)keyboardWillShow:(NSNotification*)notification {
    NSNumber *duration = [notification.userInfo objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSNumber *curve = [notification.userInfo objectForKey: UIKeyboardAnimationCurveUserInfoKey];

   // Do stuff with these values.
}

There are a lot more of these keys, and you can also get them from the UIKeyboardWillDismiss notification.

This functionality is available all the way back to iOS 3.0 :D

Heres the docs:

https://developer.apple.com/library/ios/documentation/uikit/reference/UIWindow_Class/UIWindowClassReference/UIWindowClassReference.html#//apple_ref/doc/constant_group/Keyboard_Notification_User_Info_Keys

Swift Version

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)

@objc func keyboardWillShow(_ notification: Notification) {
    let duration = notification.userInfo?[UIResponder.keyboardAnimationDurationUserInfoKey]
    let curve = notification.userInfo?[UIResponder.keyboardAnimationCurveUserInfoKey]
}

What is the iPhone's default keyboard animation rate?

- (NSTimeInterval)keyboardAnimationDurationForNotification:(NSNotification*)notification
{
    NSDictionary* info = [notification userInfo];
    NSValue* value = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
    NSTimeInterval duration = 0;
    [value getValue:&duration];
    return duration;
}

How to animate without an ease in iOS?

Don't animate. If you want it to appear and disappear instantly, try something like this:

viewcontroller.m

@property (strong, nonatomic) NSTimer *timer;

- (void)viewDidLoad {
    if (!self.timer) {
        self.timer = [NSTimer scheduledTimerWithTimeInterval:0.7 target:self selector:@selector(alternate) userInfo:nil repeats:YES];
    }
}

- (void)alternate {
        self.myDotView.hidden = !self.myDotView.hidden;
}

- (void)viewWillDisappear {
    [self.timer invalidate];
    self.timer = nil;
}

Curve Animation in Swift and UIKit - Parabolic Movement from starting/endingpoint

I don't know much about scene kit, but if you have a way to make your sprite travel across a Bezier path then a quadratic (not cubic) Bezier path is exactly what you need. A parabola is a quadratic curve, so it should be easy to model with a Quadratic bezier (2 end points plus a single control point.)

Creating a quadratic bezier curve is trivially easy. you specify a start and end point and a control point, and the curve follows the V defined by those 3 points.

Swift: NSNumber is not a subtype of UIViewAnimationCurve

UIView.setAnimationCurve(UIViewAnimationCurve.fromRaw(userInfo[UIKeyboardAnimationCurveUserInfoKey].integerValue)!)

Read more: Swift enumerations & fromRaw()

UPDATE

Based on this answer to How to use the default iOS7 UIAnimation curve, I use the new block-based animation method, + animateWithDuration:delay:options:animations:completion:, and get the UIViewAnimationOptions like so:

let options = UIViewAnimationOptions(UInt((userInfo[UIKeyboardAnimationCurveUserInfoKey] as NSNumber).integerValue << 16))

UIView block based animation weird behavior

I've found the answer.

I tis because of the additive animations in iOS 8 and above. Here is a very useful link which explains what actually happens and why the animation freezes.

http://iosoteric.com/additive-animations-animatewithduration-in-ios-8/

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