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我有以下代码。当我迭代 25 次 (5 * 5) 时,它工作正常。当我迭代 36 次(for 循环中的 6 * 6)时,它会因 SIGABRT 而崩溃。我已经粘贴了错误的图像(Xcode 中的 Playgrounds 不允许我复制粘贴它)。这是一个内部错误,是否在某处定义了 32 个行为的限制,或者这是我的代码中的一个错误?谢谢! 在此处输入图像描述

//: A UIKit based Playground for presenting user interface

import UIKit
import PlaygroundSupport

class MyViewController : UIViewController {
    var animator : UIDynamicAnimator!

    var springfields : [UIFieldBehavior] = []

    override func loadView() {
        let view = UIView()
        view.backgroundColor = .white
        animator = UIDynamicAnimator(referenceView: view)

        for i in 1...6 {
            for j in 1...6 {
                let newView = UIView()
                let dotwidth = 12
                newView.layer.cornerRadius = CGFloat(dotwidth/2);
                newView.frame = CGRect(x:20+i*25, y:20+j*25, width:dotwidth, height:dotwidth)
                newView.clipsToBounds = true
                newView.backgroundColor = .black

                let newSpringField = UIFieldBehavior.springField()
                springfields.append(newSpringField)
                newSpringField.addItem(newView)
                newSpringField.position = newView.center

                view.addSubview(newView)

                animator.addBehavior(newSpringField)
            }
        }

        self.view = view
    }
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()
PlaygroundPage.current.needsIndefiniteExecution = true
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1 回答 1

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在应用程序中运行您的代码,调试控制台输出为:

*** 由于未捕获的异常“无效关联”而终止应用程序,原因:“UIDynamicAnimator 最多支持 32 个不同的字段”

于 2018-07-10T17:42:46.153 回答