11import UIKit
2- import Cartography
32
43public final class Content : NSObject {
54 public var view : UIView
@@ -12,7 +11,7 @@ public final class Content: NSObject {
1211 }
1312
1413 public private( set) var initialPosition : Position
15- private let group = ConstraintGroup ( )
14+ private var constraints = [ NSLayoutConstraint ] ( )
1615
1716 public init ( view: UIView , position: Position , centered: Bool = true ) {
1817 self . view = view
@@ -22,40 +21,70 @@ public final class Content: NSObject {
2221
2322 super. init ( )
2423
25- constrain ( view) { [ unowned self] view in
26- view. width == self . view. frame. width
27- view. height == self . view. frame. height
28- }
24+ view. translatesAutoresizingMaskIntoConstraints = false
25+ setupSizeConstraints ( )
2926 }
3027
3128 public func layout( ) {
32- guard view . superview != nil else {
29+ guard let superview = view . superview else {
3330 return
3431 }
3532
36- constrain ( view, replace: group) { [ unowned self] view in
37- let x = self . position. left == 0.0
38- ? view. superview!. left * 1.0
39- : view. superview!. right * self . position. left
40- let y = self . position. top == 0.0
41- ? view. superview!. top * 1.0
42- : view. superview!. bottom * self . position. top
43-
44- if self . centered {
45- view. centerX == x
46- view. centerY == y
47- } else {
48- view. left == x
49- view. top == y
50- }
51- }
52-
33+ NSLayoutConstraint . deactivate ( constraints)
34+
35+ let xAttribute : NSLayoutAttribute = centered ? . centerX : . leading
36+ let yAttribute : NSLayoutAttribute = centered ? . centerY : . top
37+ let xSuperAttribute : NSLayoutAttribute = position. left == 0 ? . leading : . trailing
38+ let ySuperAttribute : NSLayoutAttribute = position. top == 0 ? . top : . bottom
39+ let xMultiplier : CGFloat = position. left == 0 ? 1 : position. left
40+ let yMultiplier : CGFloat = position. top == 0 ? 1 : position. top
41+
42+ constraints = [
43+ NSLayoutConstraint (
44+ item: view,
45+ attribute: xAttribute,
46+ relatedBy: . equal,
47+ toItem: superview,
48+ attribute: xSuperAttribute,
49+ multiplier: xMultiplier,
50+ constant: 0
51+ ) ,
52+ NSLayoutConstraint (
53+ item: view,
54+ attribute: yAttribute,
55+ relatedBy: . equal,
56+ toItem: superview,
57+ attribute: ySuperAttribute,
58+ multiplier: yMultiplier,
59+ constant: 0
60+ )
61+ ]
62+
63+ NSLayoutConstraint . activate ( constraints)
5364 view. layoutIfNeeded ( )
5465 }
5566
5667 public func animate( ) {
5768 view. superview!. layoutIfNeeded ( )
5869 }
70+
71+ private func setupSizeConstraints( ) {
72+ makeSizeConstraint ( attribute: . width, constant: view. frame. width) . isActive = true
73+ makeSizeConstraint ( attribute: . height, constant: view. frame. height) . isActive = true
74+ }
75+
76+ private func makeSizeConstraint( attribute: NSLayoutAttribute ,
77+ constant: CGFloat ) -> NSLayoutConstraint {
78+ return NSLayoutConstraint (
79+ item: view,
80+ attribute: attribute,
81+ relatedBy: . equal,
82+ toItem: nil ,
83+ attribute: . notAnAttribute,
84+ multiplier: 1 ,
85+ constant: constant
86+ )
87+ }
5988}
6089
6190public extension Content {
0 commit comments