相关疑难解决方法(0)

我正在将一个应用程序从Objective-C切换到Swift,我有几个带有存储属性的类别,例如:

@interface UIView (MyCategory)

- (void)alignToView:(UIView *)view
          alignment:(UIViewRelativeAlignment)alignment;
- (UIView *)clone;

@property (strong) PFObject *xo;
@property (nonatomic) BOOL isAnimating;

@end

由于Swift扩展不接受这些存储的属性,我不知道如何维护与Objc代码相同的结构.存储的属性对我的应用程序非常重要,我相信Apple必须在Swift中创建一些解决方案.

正如jou所说,我所寻找的实际上是使用关联对象,所以我做了(在另一个上下文中):

import Foundation
import QuartzCore
import ObjectiveC

extension CALayer {
    var shapeLayer: CAShapeLayer? {
        get {
            return objc_getAssociatedObject(self, "shapeLayer") as? CAShapeLayer
        }
        set(newValue) {
            objc_setAssociatedObject(self, "shapeLayer", newValue, UInt(OBJC_ASSOCIATION_RETAIN))
        }
    }

    var initialPath: CGPathRef! {
        get {
            return objc_getAssociatedObject(self, "initialPath") as CGPathRef
        }
        set {
            objc_setAssociatedObject(self, "initialPath", newValue, UInt(OBJC_ASSOCIATION_RETAIN))
        }
    }
}

但是在执行以下操作时我得到了EXC_BAD_ACCESS:

class UIBubble : UIView {
    required init(coder …