How to override the lazy load dataArr by swift in the new swift file?

Question

I am learning Swift.
I create the first swift file in my iOS APP project.
The swift file is a subclass. The swift father class is ao objective-c class.
In the objective-c file.m, I use a lazy array;

like this:

- (NSArray *)dataArr{
    if(_dataArr == nil){
            NSDictionary *dic1 = @{@"title":@"dog1",
                       @"message":@"the dog1"
};
NSDictionary *dic2 = @{@"title":@"dog2",
                       @"message":@"the dog2"
};
NSDictionary *dic3 = @{@"title":@"dog3",
                       @"message":@"the dog3"
};
         _dataArr = @[dic1, dic2, dic3];
    }
    return _dataArr;
}

In the OC file, I use the dataArr to set the tableView contents.

Due to my new swift file is like the OC father file, except the array content.

I want the override the array to make the swift file table view show the new content.

My swift file code like this:

class testSwift: theOCFatherClass {

   override func viewDidLoad() {

          let dic1:Dictionary = ["title":"dog1",
                                      "message":"the dog1"
                                      ];
              let dic2:Dictionary = ["title":"dog2",
                                      "message":"the dog2"
                                      ];
              let dic3:Dictionary = ["title":"dog3",
       "message":"the dog3"]

       func getdataArray() -> Array<Any>{
                return [dic1, dic2, dic3]
              }

       var dataArr = getdataArray()

       super.viewDidLoad()
   }
}

I click into the swift page on my iPhone, the content of the swift file is my OC array.

My question is how to override the dataArr by swift in the new swift file.

If you will, please write a good example.

possible duplicate https://stackoverflow.com/questions/26691935/overriding-a-stored-property-in-swift — Shivam Gaur, Dec 11 '19 at 08:16

score 0 · Accepted Answer · answered Dec 11 '19 at 11:34

As far as I know you can override a lazy Objective-C property like

@property (readonly, nonnull) NSArray<NSDictionary<NSString*,NSString*> *> *dataArr;

only with a computed property in Swift

class TestSwift: theOCFatherClass { 

    lazy var swiftDataArray = [["title":"cat1", "message":"the cat1"], ["title":"cat2", "message":"the cat2"], ["title":"cat3", "message":"the cat3"]]

    override var dataArr : [[String:String]] {
       return swiftDataArray
    }

    override func viewDidLoad() { ... }

}

How to override the lazy load dataArr by swift in the new swift file?

1 Answers1