ios - Swift - 以编程方式定位 UIButton 的问题(通用)

Question

我正在尝试将我制作的应用程序从“iPhone”转换为“通用”，我已经成功地调整了大小并定位了除我制作的 UIButtons 之外的所有内容。每次我测试应用程序时，UIButtons 在所有 iPhone 上都完美定位，但当我在 iPad 设备上运行和测试它时，UIButtons 总是定位不同(示例包括:我的按钮变长、重叠、重新定位等)下面的代码让我得到了最好的结果:

import SpriteKit
import UIKit
import GameKit

class GameScene: SKScene, SKPhysicsContactDelegate, GKGameCenterControllerDelegate {

var PlayButton : UIButton!
var GameCenterButton : UIButton!

override func didMoveToView(view: SKView) {

    PlayButton = UIButton(frame: CGRect(x: 0, y:0, width: view.frame.size.width / 3, height: 60))
    PlayButton.center = CGPoint(x: view.frame.size.width / 2 - 70, y: view.frame.size.height / 1.275)
    PlayButton.setTitle("Play", forState: UIControlState.Normal)
    PlayButton.setTitleColor(UIColor.darkGrayColor(), forState: UIControlState.Normal)
    PlayButton.addTarget(self, action: Selector("plyGame"), forControlEvents: UIControlEvents.TouchUpInside)
    self.view?.addSubview(PlayButton)
    let PlayButtonImage = UIImage(named: "RBI") as UIImage!
    _  = UIButton(type: UIButtonType.Custom)
    PlayButton.setImage(PlayButtonImage, forState: UIControlState.Normal)

    GameCenterButton = UIButton(frame: CGRect(x: 0, y:0, width: view.frame.size.width / 3, height: 60))
    GameCenterButton.center = CGPoint(x: view.frame.size.width / 2 + 70, y: view.frame.size.height / 1.275)
    GameCenterButton.setTitle("gc", forState: UIControlState.Normal)
    GameCenterButton.setTitleColor(UIColor.darkGrayColor(), forState: UIControlState.Normal)
    GameCenterButton.addTarget(self, action: Selector("Ldboards"), forControlEvents: UIControlEvents.TouchUpInside)
    self.view?.addSubview(GameCenterButton)
    let GameCenterButtonImage = UIImage(named: "GCI") as UIImage!
    _  = UIButton(type: UIButtonType.Custom)
    GameCenterButton.setImage(GameCenterButtonImage, forState: UIControlState.Normal)
}

旁注:我使用的是 Xcode 7.1 和 Swift 2.0 语法

Answer 1

我会建议你在这种情况下使用自动布局，并尝试对 button 进行约束。例如，如果你想给按钮宽度是屏幕宽度的 0.33，那么给这样的约束

    let constraint = NSLayoutConstraint(item: button, attribute: .Width, relatedBy: .Equal, toItem: button.superview, attribute: .Width, multiplier: 0.33, constant: 0)

self.view.addConstraint(约束)