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[Objective-C] Change value of existing NSLayoutConstraints |
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- (void)setConstraintValue:(CGFloat)value forAttribute:(NSLayoutAttribute)attribute animation:(BOOL)animation
{
NSArray *constraints = self.view.constraints;
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"firstAttribute = %d", attribute];
NSArray *filteredArray = [constraints filteredArrayUsingPredicate:predicate];
NSLayoutConstraint *constraint = [filteredArray firstObject];
if (constraint && constraint.constant != value) {
[self.view removeConstraint:constraint];
constraint.constant = value;
[self.view addConstraint:constraint];
if (animation) {
[UIView animateWithDuration:1.0 animations:^{
[self.view layoutIfNeeded];
}];
} else
[self.view layoutIfNeeded];
}
}
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Copyright © 1996-2021 Centro Studi Informatica di Danilo Priore. All rights reserved. P.I.10149810581. |
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