Swift 2.0错误:警告:无法加载任何Objective-C类信息

时间:2015-11-06 17:30:23

标签: swift xcode7

我收到了这个错误:

  

警告:无法加载任何Objective-C类信息

  

线程1:EXC_BAD_ACCESS(代码= 2,地址= 0x7fff5588dfb8)

...分配此课程时:

import UIKit
import QuartzCore


class CERangeSliderKnobLayer: CALayer {

    var highlighted = false
    weak var slider = CERangeSlider()

}

对于这样的变量:

import UIKit

    class CERangeSlider: UIControl {

        /*
        // Only override drawRect: if you perform custom drawing.
        // An empty implementation adversely affects performance during animation.
        override func drawRect(rect: CGRect) {
            // Drawing code
        }
        */
        var maximumValue = CGFloat()
        var minimumValue = CGFloat()
        var upperValue = CGFloat()
        var lowerValue = CGFloat()

        var trackLayer = CERangeSliderKnobLayer()
        var upperKnobLayer = CERangeSliderKnobLayer()
        var lowerKnobLayer = CERangeSliderKnobLayer()

    ...
    }

这没有任何意义。在我的项目中,我所知道的任何地方都没有Objective C.这都是斯威夫特。

更新

如果你不像那样初始化它们,而是像这样写,即

var trackLayer: CERangeSliderKnobLayer!

然后你得到一个错误:

  

致命错误:在解包可选值时意外发现nil

类似于:

trackLayer.backgroundColor = UIColor.blueColor().CGColor

1 个答案:

答案 0 :(得分:0)

出于某种原因,答案是改变我的类,以便弱属性未初始化:

import QuartzCore


class CERangeSliderKnobLayer: CALayer {

    var highlighted = false
    weak var slider: CERangeSlider!

}