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| - (void)updateConstraints { | |
| NSMutableArray *constraints = [NSMutableArray array]; | |
| NSDictionary *views; | |
| NSDictionary *metrics = @{}; | |
| void (^squareConstraint)(UIView *) = ^(UIView *aView) { | |
| [constraints addObject:[NSLayoutConstraint constraintWithItem:aView | |
| attribute:NSLayoutAttributeHeight | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:aView | |
| attribute:NSLayoutAttributeWidth | |
| multiplier:1.0 | |
| constant:0]]; | |
| }; | |
| //Iterate in threes | |
| for (NSUInteger idx=0; idx < self.subviews.count; idx++) { | |
| if (idx % 3 == 0 && idx >= 1 && idx <= 9) { | |
| views = @{ | |
| @"upperLeft": (idx > 3) ? self.subviews[idx-3] : [NSNull null], //Get the left most view on the upper row | |
| @"left":self.subviews[idx-2], | |
| @"center":self.subviews[idx-1], | |
| @"right":self.subviews[idx] | |
| }; | |
| [constraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-(>=1)-[left]-[center(==left)]-[right(==left)]-(>=1)-|" | |
| options:NSLayoutFormatAlignAllCenterY|NSLayoutFormatAlignAllTop|NSLayoutFormatAlignAllBottom | |
| metrics:metrics | |
| views:views]]; | |
| [constraints addObject:[NSLayoutConstraint constraintWithItem:views[@"center"] | |
| attribute:NSLayoutAttributeCenterX | |
| relatedBy:NSLayoutRelationEqual | |
| toItem:self | |
| attribute:NSLayoutAttributeCenterX | |
| multiplier:1.0 | |
| constant:0.0]]; | |
| if (views[@"upperLeft"] == [NSNull null]) { | |
| [constraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-[left]" | |
| options:0 | |
| metrics:metrics | |
| views:views]]; | |
| } else { | |
| [constraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[upperLeft]-[left]" | |
| options:0 | |
| metrics:metrics | |
| views:views]]; | |
| } | |
| } | |
| if (idx == self.subviews.count -1 ) { | |
| //Place the '0' and delete button | |
| [constraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:[zero]-[delete(==zero)]" | |
| options:NSLayoutFormatAlignAllCenterY|NSLayoutFormatAlignAllTop|NSLayoutFormatAlignAllBottom | |
| metrics:metrics | |
| views:@{ | |
| @"zero":self.subviews.firstObject, | |
| @"delete":self.subviews.lastObject | |
| }]]; | |
| [constraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[upperCenter]-[zero(==upperCenter)]-|" | |
| options:NSLayoutFormatAlignAllCenterX | |
| metrics:metrics | |
| views:@{ | |
| @"zero":self.subviews.firstObject, | |
| @"upperCenter":views[@"center"] | |
| }]]; | |
| } | |
| //Make them all square | |
| squareConstraint(self.subviews[idx]); | |
| } | |
| [self addConstraints:constraints]; | |
| [super updateConstraints]; | |
| } |
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