Category on UIView to simplify the creation of common layout constraints. The code is described and introduced in this blog post.
Here's the header to save you a click: /// Return a frameless view that does not automatically use autoresizing (for use in autolayouts) +(id)autoLayoutView;
/// Centers the receiver in the superview
-(NSArray *)centerInView:(UIView*)superview;
-(NSLayoutConstraint *)centerInContainerOnAxis:(NSLayoutAttribute)axis;
// Pin an attribute to the same attribute on another view. Both views must be in the same view hierarchy
-(NSLayoutConstraint *)pinAttribute:(NSLayoutAttribute)attribute toSameAttributeOfView:(UIView *)peerView;
/// Pins a view to a specific edge(s) of its superview, with a specified inset
-(NSArray*)pinToSuperviewEdges:(JRTViewPinEdges)edges inset:(CGFloat)inset;
/// Pins a view to all edges of its superview, with specified edge insets
-(NSArray*)pinToSuperviewEdgesWithInset:(UIEdgeInsets)insets;
/// Pins a view's edge to a peer view's edge. Both views must be in the same view hierarchy
-(NSLayoutConstraint *)pinEdge:(NSLayoutAttribute)edge toEdge:(NSLayoutAttribute)toEdge ofView:(UIView*)peerView;
-(NSLayoutConstraint *)pinEdge:(NSLayoutAttribute)edge toEdge:(NSLayoutAttribute)toEdge ofView:(UIView *)peerView inset:(CGFloat)inset;
/// Set to a specific size. 0 in any axis results in no constraint being applied.
-(NSArray *)constrainToSize:(CGSize)size;
/// Pins a point to a specific point in the superview's frame. Use NSLayoutAttributeNotAnAttribute to only pin in one dimension
-(void)pinPointAtX:(NSLayoutAttribute)x Y:(NSLayoutAttribute)y toPoint:(CGPoint)point;
/// Spaces the views evenly along the selected axis. Will force the views to the same size to make them fit
-(void)spaceViews:(NSArray*)views onAxis:(UILayoutConstraintAxis)axis withSpacing:(CGFloat)spacing alignmentOptions:(NSLayoutFormatOptions)options;