iOS ui界面vtf 开发

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addConstraints

添加约束的步奏

添加控件到view中
设置translateResizeLayoutintoautolayout = false
添加约束
注意
约束：出现有父子关系的约束时候
【父 addConstarints 子】

注意

/** *  两个子控件不可以添加相对的view    必须是    父亲 = 子 * mul +constant */// 相对约束

// NSLayoutConstraint * blueRight = [NSLayoutConstraint constraintWithItem:blueview attribute:NSLayoutAttributeLeftMargin relatedBy:NSLayoutRelationEqual toItem:redview attribute:NSLayoutAttributeRightMargin multiplier:0.0f constant:50];
//
// [blueview addConstraint: blueRight];
// [redview addConstraint: blueRight];

报出来的错误

[NSLayoutConstraint constraintWithItem:attribute:relatedBy:toItem:attribute:multiplier:constant:]: A multiplier of 0 or a nil second item together with a location for the first attribute creates an illegal constraint of a location equal to a constant. Location attributes must be specified in pairs'

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