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#import <UIKit/UIKit.h> | |
@interface UIView (TLLayout) | |
@property (nonatomic, strong) NSArray *hiddenConstraints; | |
// set hidden and remove any constraints involving this view from its superview | |
- (void)hideAndRemoveConstraints; | |
- (void)showAndRestoreConstraints; | |
@end |
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#import <objc/runtime.h> | |
#import "UIView+TLLayout.h" | |
MAKE_CATEGORIES_LOADABLE(UIView_TLLayout) | |
static char kTLHiddenConstraintsKey; | |
@implementation UIView (TLLayout) | |
@dynamic hiddenConstraints; | |
- (NSArray *)hiddenConstraints { | |
return objc_getAssociatedObject(self, &kTLHiddenConstraintsKey); | |
} | |
- (void)setHiddenConstraints:(NSArray *)constraints { | |
objc_setAssociatedObject(self, &kTLHiddenConstraintsKey, constraints, OBJC_ASSOCIATION_RETAIN_NONATOMIC); | |
} | |
- (void)hideAndRemoveConstraints | |
{ | |
self.hidden = YES; | |
if (!self.hiddenConstraints) { | |
self.hiddenConstraints = [self.superview.constraints objectsPassingTest:^BOOL(NSLayoutConstraint *constraint, NSUInteger idx, BOOL *stop) { | |
return constraint.firstItem == self || constraint.secondItem == self; | |
}]; | |
[self.superview removeConstraints:self.hiddenConstraints]; | |
} | |
} | |
- (void)showAndRestoreConstraints | |
{ | |
if (self.hiddenConstraints) { | |
[self.superview addConstraints:self.hiddenConstraints]; | |
self.hiddenConstraints = nil; | |
} | |
self.hidden = NO; | |
} | |
@end |
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