IOS Masonry 学习

约束的关系：
equalTo  <=======>   NSLayoutRelationEqual   等于

lessThanOrEqualTo   <======>  NSLayoutRelationLessThanOrEqual   小于或等于

greaterThanOrEqualTo <=======>  NSLayoutRelationGreaterThanOrEqual  大于或等于

 
NSNumber给约束设置具体的值
<1>//width >= 200 && width <= 400
make.width.greaterThanOrEqualTo(@200);
make.width.lessThanOrEqualTo(@400)
<2>//creates view.left = view.superview.left + 10
make.left.lessThanOrEqualTo(@10)


使用数组NSArray设置约束
make.height.equalTo(@[view1.mas_height, view2.mas_height]);
make.height.equalTo(@[view1, view2]);
make.left.equalTo(@[view1, @100, view3.right]);



使用优先级设置约束
.priorityHigh <======> UILayoutPriorityDefaultHigh     高优先级

.priorityMedium <========> between high and low        介于高/低之间

.priorityLow <=========> UILayoutPriorityDefaultLow   低优先级

make.left.greaterThanOrEqualTo(label.mas_left).with.priorityLow();
make.top.equalTo(label.mas_top).with.priority(600);


 
使用MASCompositeConstraints添加约束
edges：边缘
// make top, left, bottom, right equal view2
    make.edges.equalTo(view2);

// make top = superview.top + 5, left = superview.left + 10,
// bottom = superview.bottom - 15, right = superview.right - 20
    make.edges.equalTo(superview).insets(UIEdgeInsetsMake(5, 10, 15, 20))
// All edges but the top should equal those of the superview
make.left.right.and.bottom.equalTo(superview);
make.top.equalTo(otherView);
 
size：大小
// make width and height greater than or equal to titleLabel
    make.size.greaterThanOrEqualTo(titleLabel)

// make width = superview.width + 100, height = superview.height - 50
    make.size.equalTo(superview).sizeOffset(CGSizeMake(100, -50))
 
center：中心
// make centerX and centerY = button1
    make.center.equalTo(button1)

// make centerX = superview.centerX - 5, centerY = superview.centerY + 10
    make.center.equalTo(superview).centerOffset(CGPointMake(-5, 10))