@property (readonly) KeepLayout *keep<AttributeName>;
@property (readonly) KeepLayout *(^keep<AttributeName>To)(UIView *)); // Returns block taking another view.

KeepAttribute *width = view.keepWidth;
KeepAttribute *topOffset = view.keepTopOffsetTo(anotherView); // Invoking the block that returns the actual attribute.

// aligns are the same regardless of order
viewOne.keepLeftAlign(viewTwo) == viewTwo.keepLeftAlign(viewOne)
// left offset from 1 to 2 is right offset from 2 to 1
viewOne.keepLeftOffset(viewTwo) == viewTwo.keepRightOffset(viewOne)

KeepValue value = 42; // value 42 at priority 1000
value = 42 +keepHigh; // value 42 at priority 750
value = 42 +keepLow; // value 42 at priority 250
value = 42 +keepFitting; // value 42 at priority 50

// Arbitrary priority:
value = 42 +keepAt(800); // value 42 at priority 800

Required > High > Low > Fitting
1000       750    250   50

view.keepWidth.equal = 150;

view.keepTopInset.min = 10;

firstView.keepLeftOffsetTo(secondView).min = 10;

KeepAttribute *leftInsets = [KeepAttribute group:
                             viewOne.keepLeftInset,
                             viewTwo.keepLeftInset,
                             viewThree.keepLeftInset,
                             nil];
leftInsets.equal = 10;

view.keepSize    // group of both Width and Height
view.keepInsets  // group of all four insets
view.keepCenter  // group of both axis of position
view.keepEdgeAlignTo  // group of alignments to all four edges

// Create atomic group
KeepAtomic *layout = [KeepAtomic layout:^{
    self.view.keepWidth.min = 320 +keepHigh; // Set minimum width limit.
    self.view.keepVerticalInsets.equal = 0; // Vertically stretch to fit.
}];

[layout deactivate];
// self.view no longer has minimum width of 320 and is no longer stretched vertically.

self.view.keepWidth.min = KeepNone; // Removes minimum width constraint.
[self.view.keepWidth deactivate]; // Removes all constraints for width.

[view keepSize:CGSizeMake(100, 200)];
[view keepInsets:UIEdgeInsetsMake(10, 20, 30, 40)];
[view keepCentered];

NSArray *views = @[ viewOne, viewTwo, viewThree ];
views.keepInsets.min = 10;

NSArray *views = @[ viewOne, viewTwo, viewThree ];
[views keepWidthsEqual];
[views keepHorizontalOffsets:20];
[views keepTopAligned];

view.keepWidth.equal = 100;

[view.superview keepAnimatedWithDuration:1 layout:^{
    view.keepWidth.equal = 200;
}];

imageView.keepEdgeAlignTo(controller.keepLayoutView).equal = 0;
// imageView will not be covered by UINavigationBar or UITabBar

"<KeepLayoutConstraint:0xc695560 left offset of <YourView 0xc682cf0> to <YourAnotherView 0xc681350> equal to 20 with required priority>",
"<KeepLayoutConstraint:0xc695560 left offset of <YourView 0xc682cf0> to <YourAnotherView 0xc681350> equal to 50 with required priority>",