UIBezierPath Animation in UIView - ios

Question

I'm trying to make a animation that is done in Skype iOS application. The animation can be seen in this link Animation Section 3:Add a Contact
I tried with UIBezierPath but I can't do it. Any ideas?
Thanks!
My code
#implementation CustomView
#pragma mark - Lifecycle and initialize components
- (instancetype) initWithFrame:(CGRect)frame {
self = [super initWithFrame:frame];
if ( self ) {
self.alpha = 0;
[self configureCancelButton];
[self configureCollectionView];
[self addSubview:self.cancelButton];
[self addSubview:self.collectionView];
}
return self;
}
- (void) configureCancelButton {
self.cancelButton = [UIButton buttonWithType:UIButtonTypeSystem];
[self.cancelButton setTitle:#"Cancel" forState:UIControlStateNormal];
self.cancelButton.titleLabel.font = [UIFont systemFontOfSize:20];
[self.cancelButton addTarget:self action:#selector (cancelView) forControlEvents:UIControlEventTouchUpInside];
self.cancelButton.backgroundColor = [UIColor colorWithWhite:1.0 alpha:0.8];
self.cancelButton.layer.cornerRadius = 7.f;
self.frameForCancelButton = CGRectMake (self.bounds.origin.x+5, self.bounds.size.height - kCancelButtonHeight - 5, self.bounds.size.width-10, kCancelButtonHeight);
self.cancelButton.frame = CGRectMake (self.frameForCancelButton.origin.x, self.frameForCancelButton.origin.y + kAnimationOffset, self.frameForCancelButton.size.width, self.frameForCancelButton.size.height);
}
- (void) configureCollectionView {
UICollectionViewFlowLayout *layout= [[UICollectionViewFlowLayout alloc] init];
layout.itemSize = CGSizeMake(kItemSize, kItemSize);
layout.minimumInteritemSpacing = 3.0;
layout.sectionInset = UIEdgeInsetsMake(0, 7, 7, 10);
layout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
self.frameForCollectionView = CGRectMake(self.cancelButton.frame.origin.x, self.frame.size.height - (self.cancelButton.frame.size.height + 10 + kCollectionHeight), self.cancelButton.bounds.size.width, kCollectionHeight);
self.collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake (self.frameForCollectionView.origin.x, self.frameForCollectionView.origin.y + kAnimationOffset, self.frameForCollectionView.size.width, self.frameForCollectionView.size.height)
collectionViewLayout:layout];
self.collectionView.backgroundColor = [UIColor colorWithWhite:1 alpha:.8];
[self.collectionView registerClass:[RAShareCell class] forCellWithReuseIdentifier:#"Cell"];
self.collectionView.delegate = self;
self.collectionView.dataSource = self;
self.collectionView.layer.cornerRadius = 7.f;
}
#pragma mark - Public Methods
- (void) present {
[UIView animateWithDuration:0.35 animations:^{
self.alpha = 1;
self.darkView.alpha = .5;
}];
[UIView animateWithDuration:1.0 delay:0.45 options:(UIViewAnimationOptions) UIViewAnimationCurveEaseInOut animations:^{
[self setupAnimation];
} completion:nil];
}
- (void) cancelView {
[UIView animateWithDuration:0.35 delay:0 options:UIViewAnimationCurveEaseInOut animations:^{
self.cancelButton.frame = CGRectMake (self.frameForCancelButton.origin.x, self.frameForCancelButton.origin.y + kAnimationOffset, self.frameForCancelButton.size.width, self.frameForCancelButton.size.height);
self.collectionView.frame= CGRectMake(self.frameForCollectionView.origin.x, self.frameForCollectionView.origin.y + kAnimationOffset, self.frameForCollectionView.size.width, self.frameForCollectionView.size.height);
} completion:^(BOOL finished) {
[self removeFromSuperview];
}];
;
}
- (void) setupAnimation {
self.cancelButton.alpha = 1;
self.collectionView.alpha = 1;
self.cancelButton.frame = self.frameForCancelButton;
self.collectionView.frame = self.frameForCollectionView;
[self addShapeLayer];
}
- (void)addShapeLayer
{
self.shapeLayer = [CAShapeLayer layer];
self.shapeLayer.path = [[self pathAtInterval:0.0] CGPath];
self.shapeLayer.fillColor = [[UIColor redColor] CGColor];
self.shapeLayer.lineWidth = 3.0;
self.shapeLayer.strokeColor = [[UIColor redColor] CGColor];
[self.collectionView.layer insertSublayer:self.shapeLayer atIndex:0];
}
- (UIBezierPath *) pathAtInterval:(NSTimeInterval) interval {
UIBezierPath *path = [UIBezierPath bezierPath];
[path moveToPoint:CGPointMake(self.collectionView.frame.origin.x,self.collectionView.frame.origin.y)];
[path addQuadCurveToPoint:CGPointMake(self.collectionView.frame.size.width, self.collectionView.frame.origin.y) controlPoint:CGPointMake(self.collectionView.frame.size.width/2, self.collectionView.frame.origin.y-30)];
return path;
}

Answer 1

Your animation block does not contain any animations. You should move your setup outside of the animation block and then animate within it.
[self setupAnimation];
[UIView animateWithDuration:1.0 delay:0.45 options:(UIViewAnimationOptions) UIViewAnimationCurveEaseInOut animations:^{
// animate something
} completion:nil];
In addition to this, your intended animation does not have a linear progression, meaning that you'l want to use animateKeyframesWithDuration instead.
[UIView animateKeyframesWithDuration:1.0 delay:0.45 options:UIViewAnimationCurveEaseInOut animations:^{
for (NSInteger i = 0; i < 10; i++) {
[UIView addKeyframeWithRelativeStartTime:i/10.0
relativeDuration:1.0/10.0
animations:^{
self.shapeLayer = [self pathAtInterval:i/10.0];
}];
}
} completion:nil];

Answer 2

1, add the path you created to CAShaperLayer object;
2, see the "strokeStart" and "strokeEnd" properties in CAShapeLayer class;
3, add a animation which called "CABasicAnimation" to your Layer obj.