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61 lines
2.3 KiB
61 lines
2.3 KiB
//
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// SnapKit
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//
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// Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#if os(iOS) || os(tvOS)
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import UIKit
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#else
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import AppKit
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#endif
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public class LayoutConstraint : NSLayoutConstraint {
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public var label: String? {
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get {
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return self.identifier
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}
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set {
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self.identifier = newValue
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}
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}
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internal weak var constraint: Constraint? = nil
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}
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internal func ==(lhs: LayoutConstraint, rhs: LayoutConstraint) -> Bool {
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// If firstItem or secondItem on either constraint has a dangling pointer
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// this comparison can cause a crash. The solution for this is to ensure
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// your layout code hold strong references to things like Views, LayoutGuides
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// and LayoutAnchors as SnapKit will not keep strong references to any of these.
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guard lhs.firstAttribute == rhs.firstAttribute &&
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lhs.secondAttribute == rhs.secondAttribute &&
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lhs.relation == rhs.relation &&
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lhs.priority == rhs.priority &&
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lhs.multiplier == rhs.multiplier &&
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lhs.secondItem === rhs.secondItem &&
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lhs.firstItem === rhs.firstItem else {
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return false
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}
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return true
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}
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