比我ELCImagePickerController类需要增加tag属性代码：
import ObjectiveC
private var xoTag: UInt = 0
extension ELCImagePickerController {
var tag: UInt {
get {
return (objc_getAssociatedObject(self, xoTag) as? UInt)!
}
set(newValue) {
objc_setAssociatedObject(self, xoTag, newValue, objc_AssociationPolicy(OBJC_ASSOCIATION_RETAIN))
}
}
}
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