有時候，我們需要動態改變View中AutoLayout裡的某個值，比如移動x值，或者y值，改怎麼辦呢？

 

 

以下用到 ZLLayoutConstraint 是別名 NSLayoutConstraint

typedef NSLayoutConstraint ZLLayoutConstraint;

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刪除所有約束

 

#pragma mark - remove view to superView autoLayout
- (void)removeAllAutoLayout{
    [self removeConstraints:self.constraints];
    for (ZLLayoutConstraint *constraint in self.superview.constraints) {
        if ([constraint.firstItem isEqual:self]) {
            [self.superview removeConstraint:constraint];
        }
    }
}

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刪除單個約束

 

#pragma mark - remove single constraint
- (void)removeAutoLayout:(ZLLayoutConstraint *)constraint{
    for (ZLLayoutConstraint *constraint in self.superview.constraints) {
        if ([constraint isEqual:constraint]) {
            [self.superview removeConstraint:constraint];
        }
    }
}

 

 

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刪除多個約束

 

#pragma mark - remove constraints www.2cto.com
- (void)removeAutoLayoutConstraints:(NSArray *)constraints{
    for (ZLLayoutConstraint *constraint in constraints) {
        for (ZLLayoutConstraint *superViewConstraint in self.superview.constraints) {
            if ([superViewConstraint isEqual:constraint]) {
                [self.superview removeConstraint:constraint];
            }
        }
    }
}