Shake visual effect on iPhone (NOT shaking the device)

Question

On login failure, I\'d prefer to avoid showing an alert, it\'s too fleeting. Showing the alert and then showing the text somewhere on the login screen seems like duplication

Answer 1

Using iOS 4+ block based UIKit animations (and loosely based on on jayccrown's answer):

- (void)shakeView:(UIView *)viewToShake
{
    CGFloat t = 2.0;
    CGAffineTransform translateRight  = CGAffineTransformTranslate(CGAffineTransformIdentity, t, 0.0);
    CGAffineTransform translateLeft = CGAffineTransformTranslate(CGAffineTransformIdentity, -t, 0.0);

    viewToShake.transform = translateLeft;

    [UIView animateWithDuration:0.07 delay:0.0 options:UIViewAnimationOptionAutoreverse|UIViewAnimationOptionRepeat animations:^{
        [UIView setAnimationRepeatCount:2.0];
        viewToShake.transform = translateRight;
    } completion:^(BOOL finished) {
        if (finished) {
            [UIView animateWithDuration:0.05 delay:0.0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
                viewToShake.transform = CGAffineTransformIdentity;
            } completion:NULL];
        }
    }];
}

Answer 2

Simply changing the X coordinate of the center property of your view might do the trick. If you haven't done any core animation before it's pretty straight-forward.

First, start an animation right, then listen for it to finish, and then move back to the left, and so on. Getting the timing down so it "feels right" might take a while.

- (void)animationFinishCallback:(NSString *)animationID finished:(BOOL)finished context:(void *)context
{
  if ([animationID isEqualToString:@"MoveRight"]) {
    [UIView beginAnimations:@"MoveLeft" context:NULL];
    [UIView setAnimationDuration:1.0];
    [UIView setAnimationDelay: UIViewAnimationCurveEaseIn];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(animationFinishCallback:finished:context:)];

    myView.center = CGRectMake(newX, newY);
    [UIView commitAnimations];
  }
}

Answer 3

Using Auto Layout, I adapted Chris Miles' answer but animated NSLayoutConstraints like this:

NSLayoutConstraint *left  = ...
NSLayoutConstraint *right = ...

[UIView animateWithDuration:0.08 delay:0.0 options:UIViewAnimationOptionAutoreverse|UIViewAnimationOptionRepeat animations:^{
    [UIView setAnimationRepeatCount:3];
    left.constant  = 15.0;
    right.constant = 25.0;
    [self.view layoutIfNeeded];
} completion:^(BOOL finished) {
    if (finished) {
        [UIView animateWithDuration:0.08 animations:^{
            left.constant  = 20.0;
            right.constant = 20.0;
            [self.view layoutIfNeeded];
        } completion:NULL];
    }
}];

Answer 4

I think this is a more efficient solution:

Swift:

let anim = CAKeyframeAnimation( keyPath:"transform" )
anim.values = [
    NSValue( CATransform3D:CATransform3DMakeTranslation(-5, 0, 0 ) ),
    NSValue( CATransform3D:CATransform3DMakeTranslation( 5, 0, 0 ) )
]
anim.autoreverses = true
anim.repeatCount = 2
anim.duration = 7/100

viewToShake.layer.addAnimation( anim, forKey:nil )

Obj-C:

CAKeyframeAnimation * anim = [ CAKeyframeAnimation animationWithKeyPath:@"transform" ] ;
anim.values = @[ 
    [ NSValue valueWithCATransform3D:CATransform3DMakeTranslation(-5.0f, 0.0f, 0.0f) ], 
    [ NSValue valueWithCATransform3D:CATransform3DMakeTranslation( 5.0f, 0.0f, 0.0f) ] 
] ;
anim.autoreverses = YES ;
anim.repeatCount = 2.0f ;
anim.duration = 0.07f ;

[ viewToShake.layer addAnimation:anim forKey:nil ] ;

Only one animation object is created and it's all performed at the CoreAnimation level.

Answer 5

In iOS 7.0 or later, UIKit keyframe animation is available.

[UIView animateKeyframesWithDuration:0.5 delay:0.0 options:0 animations:^{
    [UIView setAnimationCurve:UIViewAnimationCurveLinear];

    NSInteger repeatCount = 8;
    NSTimeInterval duration = 1.0 / (NSTimeInterval)repeatCount;

    for (NSInteger i = 0; i < repeatCount; i++) {
        [UIView addKeyframeWithRelativeStartTime:i * duration relativeDuration:duration animations:^{
            CGFloat dx = 5.0;
            if (i == repeatCount - 1) {
                viewToShake.transform = CGAffineTransformIdentity;
            } else if (i % 2) {
                viewToShake.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, -dx, 0.0);
            } else {
                viewToShake.transform = CGAffineTransformTranslate(CGAffineTransformIdentity, +dx, 0.0);
            }
        }];
    }
} completion:completion];

Answer 6

A solution I used for constraints which I set in my storyboard. Without using animateWithDuration.

@IBOutlet var balloonHorizontalConstraint: NSLayoutConstraint!

NSTimer.scheduledTimerWithTimeInterval(0.04, target: self, selector: "animateBalloon", userInfo: nil, repeats: true)

func animateBalloon() {
    switch balloonHorizontalConstraint.constant {
    case -46:
        balloonHorizontalConstraint.constant = -50
    default:
        balloonHorizontalConstraint.constant = -46
    }
}

In my case the animation just kept on going, but I pop my viewcontroller after a duration of a few seconds, this stops my timer aswell.