AssetGridModel 继承PHAsset类并添加isSelected属性
fileprivate var fetchResult: [AssetGridModel]!
let allPhotosOptions = PHFetchOptions()
allPhotosOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
let fetchAssets = PHAsset.fetchAssets(with: allPhotosOptions)
或者
let fetchAssets = AssetGridModel.fetchAssets(with: allPhotosOptions)
为什么我出来的类型都是PHAsset，不是我写的继承类而不能改变我添加的属性？
请指教，谢谢
使用运行时解决它
extension PHAsset {
struct RuntimeKey {
static var isSelectedKey = UnsafeRawPointer.init(bitPattern: "isSelectedKey".hashValue)
}
var isSelectedImage: Bool? {
set {
objc_setAssociatedObject(self, PHAsset.RuntimeKey.isSelectedKey, newValue, .OBJC_ASSOCIATION_COPY_NONATOMIC)
}
get {
return objc_getAssociatedObject(self, PHAsset.RuntimeKey.isSelectedKey) as? Bool
}
}
}
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我来说两句