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fix a constraint mistake in ButtonViewController #16

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fix a constraint mistake in ButtonViewController #16

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26 changes: 17 additions & 9 deletions Popping/ButtonViewController.m
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ @interface ButtonViewController()
@property (nonatomic) UILabel *errorLabel;
@property (nonatomic) FlatButton *button;
@property (nonatomic) UIActivityIndicatorView *activityIndicatorView;
@property (nonatomic) NSLayoutConstraint *errorLabelCenterYConstraint;

- (void)addButton;
- (void)addLabel;
Expand Down Expand Up @@ -53,7 +54,7 @@ - (void)addButton
attribute:NSLayoutAttributeCenterX
multiplier:1.f
constant:0.f]];

[self.view addConstraint:[NSLayoutConstraint constraintWithItem:self.button
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual
Expand Down Expand Up @@ -81,14 +82,15 @@ - (void)addLabel
attribute:NSLayoutAttributeCenterX
multiplier:1
constant:0.f]];

[self.view addConstraint:[NSLayoutConstraint
constraintWithItem:self.errorLabel
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual toItem:self.button
attribute:NSLayoutAttributeCenterY
multiplier:1
constant:0]];

self.errorLabelCenterYConstraint = [NSLayoutConstraint
constraintWithItem:self.errorLabel
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual toItem:self.button
attribute:NSLayoutAttributeCenterY
multiplier:1
constant:0];
[self.view addConstraint:self.errorLabelCenterYConstraint];

self.errorLabel.layer.transform = CATransform3DMakeScale(0.5f, 0.5f, 1.f);
}
Expand Down Expand Up @@ -138,6 +140,9 @@ - (void)showLabel
POPSpringAnimation *layerPositionAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayerPositionY];
layerPositionAnimation.toValue = @(self.button.layer.position.y + self.button.intrinsicContentSize.height);
layerPositionAnimation.springBounciness = 12;
[layerPositionAnimation setCompletionBlock:^(POPAnimation *animation, BOOL finished) {
self.errorLabelCenterYConstraint.constant = self.button.intrinsicContentSize.height;
}];
[self.errorLabel.layer pop_addAnimation:layerPositionAnimation forKey:@"layerPositionAnimation"];
}

Expand All @@ -149,6 +154,9 @@ - (void)hideLabel

POPBasicAnimation *layerPositionAnimation = [POPBasicAnimation animationWithPropertyNamed:kPOPLayerPositionY];
layerPositionAnimation.toValue = @(self.button.layer.position.y);
[layerPositionAnimation setCompletionBlock:^(POPAnimation *animation, BOOL finished) {
self.errorLabelCenterYConstraint.constant = 0.0f;
}];
[self.errorLabel.layer pop_addAnimation:layerPositionAnimation forKey:@"layerPositionAnimation"];
}

Expand Down