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