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Fix bug where pinning composite to composite would fail

This commit is contained in:
Robert Payne 2016-09-10 16:38:40 +12:00
parent 9b1a0519ee
commit cdedbcdea7
2 changed files with 25 additions and 3 deletions
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6
Source/Constraint.swift
View File

@ -82,7 +82,7 @@ public class Constraint {
// get layout to attribute
let layoutToAttribute: NSLayoutAttribute
#if os(iOS) || os(tvOS)
if layoutToAttributes.count > 1 {
if layoutToAttributes.count > 0 {
if self.from.attributes == .edges && self.to.attributes == .margins {
switch layoutFromAttribute {
case .left:
@ -109,11 +109,11 @@ public class Constraint {
default:
fatalError()
}
} else if self.from.attributes == self.to.attributes {
layoutToAttribute = layoutFromAttribute
} else {
layoutToAttribute = layoutToAttributes[0]
}
} else if layoutToAttributes.count == 1 {
layoutToAttribute = layoutToAttributes[0]
} else {
layoutToAttribute = layoutFromAttribute
}

22
Tests/Tests.swift
View File

@ -441,6 +441,28 @@ class SnapKitTests: XCTestCase {
}
func testEdgesToEdges() {
var fromAttributes = Set<NSLayoutAttribute>()
var toAttributes = Set<NSLayoutAttribute>()
let view = View()
self.container.addSubview(view)
view.snp.remakeConstraints { (make) -> Void in
make.edges.equalTo(self.container.snp.edges)
}
XCTAssertEqual(self.container.snp_constraints.count, 4, "Should have 4 constraints")
for constraint in (container.snp_constraints as! [NSLayoutConstraint]) {
fromAttributes.insert(constraint.firstAttribute)
toAttributes.insert(constraint.secondAttribute)
}
XCTAssert(fromAttributes == [.top, .left, .bottom, .right])
XCTAssert(toAttributes == [.top, .left, .bottom, .right])
}
func testLayoutGuideConstraints() {
let vc = UIViewController()
vc.view = UIView(frame: CGRect(x: 0, y: 0, width: 300, height: 300))