如何在ios中逐步添加子视图和子视图按钮标签的布局？答案

【问题标题】：How to add layout for subview and subview button label step by step in ios?如何在ios中逐步添加子视图和子视图按钮标签的布局？
【发布时间】：2015-08-21 10:08:39
【问题描述】：

如何为视图控制器的子视图添加约束简单解释一下

【问题讨论】：

请详细说明您的问题

标签： ios autolayout size-classes

【解决方案1】：

// create a new view
self.containerView = [UIView new];
// before adding constraints always add respective view to superview
[self.view addSubview:self.containerView]; 
[self.containerView setTranslatesAutoresizingMaskIntoConstraints:false];

// add container on newly added view
NSLayoutConstraint *topConstraintContainer = [NSLayoutConstraint constraintWithItem:self.containerView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:self.topLayoutGuide attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0];
NSLayoutConstraint *leadingConstraintContainer = [NSLayoutConstraint constraintWithItem:self.containerView attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:self.containerView.superview attribute:NSLayoutAttributeLeading multiplier:1.0 constant:0];
NSLayoutConstraint *trailingConstraintContainer = [NSLayoutConstraint constraintWithItem:self.containerView attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:self.containerView.superview attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:0];
NSLayoutConstraint *bottomConstraintContainer = [NSLayoutConstraint constraintWithItem:self.containerView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.bottomLayoutGuide attribute:NSLayoutAttributeBottom multiplier:1.0 constant:0];

// add constraint to superview of respective view
[self.view addConstraints:@[topConstraintContainer,leadingConstraintContainer,trailingConstraintContainer,bottomConstraintContainer]];

有很多可能性，但这是主要流程还有可用的第三方库，可以更轻松地添加约束，例如 PureLayout

【讨论】：