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Support priority update #505

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Support priority update #505

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30 changes: 24 additions & 6 deletions Masonry/MASViewConstraint.m
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Original file line number Diff line number Diff line change
Expand Up @@ -163,10 +163,17 @@ - (void)setSecondViewAttribute:(id)secondViewAttribute {

- (MASConstraint * (^)(MASLayoutPriority))priority {
return ^id(MASLayoutPriority priority) {
NSAssert(!self.hasBeenInstalled,
@"Cannot modify constraint priority after it has been installed");

self.layoutPriority = priority;
if (!self.hasBeenInstalled) {
self.layoutPriority = priority;
} else {
NSAssert(priority != UILayoutPriorityRequired
&& self.layoutConstraint.priority != UILayoutPriorityRequired,
@"the priority cannot be changed from/to NSLayoutPriorityRequired");
if (priority != UILayoutPriorityRequired
&& self.layoutConstraint.priority != UILayoutPriorityRequired){
self.layoutConstraint.priority = priority;
}
}
return self;
};
}
Expand Down Expand Up @@ -359,8 +366,20 @@ - (void)install {
existingConstraint = [self layoutConstraintSimilarTo:layoutConstraint];
}
if (existingConstraint) {
// just update the constant
// update the constant
existingConstraint.constant = layoutConstraint.constant;

// update the priority if possible
if (existingConstraint.priority != layoutConstraint.priority) {
NSAssert(existingConstraint.priority != UILayoutPriorityRequired
&& layoutConstraint.priority != UILayoutPriorityRequired,
@"the priority cannot be changed from/to NSLayoutPriorityRequired");
if (existingConstraint.priority != UILayoutPriorityRequired
&& layoutConstraint.priority != UILayoutPriorityRequired){
existingConstraint.priority = layoutConstraint.priority;
}
}

self.layoutConstraint = existingConstraint;
} else {
[self.installedView addConstraint:layoutConstraint];
Expand All @@ -382,7 +401,6 @@ - (MASLayoutConstraint *)layoutConstraintSimilarTo:(MASLayoutConstraint *)layout
if (existingConstraint.secondAttribute != layoutConstraint.secondAttribute) continue;
if (existingConstraint.relation != layoutConstraint.relation) continue;
if (existingConstraint.multiplier != layoutConstraint.multiplier) continue;
if (existingConstraint.priority != layoutConstraint.priority) continue;

return (id)existingConstraint;
}
Expand Down