Passing a closure as a init parameter in Swift

I'm trying to convert an Objective-C code snippet I found on this article. Here's the original code.

.h file

#import <Foundation/Foundation.h>

typedef void (^TableViewCellConfigureBlock)(id cell, id item);

@interface ArrayDataSource : NSObject <UITableViewDataSource>

- (id)initWithItems:(NSArray *)anItems
     cellIdentifier:(NSString *)aCellIdentifier
 configureCellBlock:(TableViewCellConfigureBlock)aConfigureCellBlock;

@end

.m file

@interface ArrayDataSource ()

@property (nonatomic, strong) NSArray *items;
@property (nonatomic, copy) NSString *cellIdentifier;
@property (nonatomic, copy) TableViewCellConfigureBlock configureCellBlock;

@end


@implementation ArrayDataSource

- (id)initWithItems:(NSArray *)anItems
     cellIdentifier:(NSString *)aCellIdentifier
 configureCellBlock:(TableViewCellConfigureBlock)aConfigureCellBlock
{
    self = [super init];
    if (self) {
        self.items = anItems;
        self.cellIdentifier = aCellIdentifier;
        self.configureCellBlock = [aConfigureCellBlock copy];
    }
    return self;
}

@end

Here's my attempt.

import Foundation
import UIKit

public class TableViewDataSource: NSObject, UITableViewDataSource {

    var items: [AnyObject]
    var cellIdentifier: String
    var TableViewCellConfigure: (cell: AnyObject, item: AnyObject) -> Void

    init(items: [AnyObject]!, cellIdentifier: String!, configureCell: TableViewCellConfigure) {
        self.items = items
        self.cellIdentifier = cellIdentifier
        self.TableViewCellConfigure = configureCell

        super.init()
    }

}

But I get an error at this line self.TableViewCellConfigure = configureCell saying Use of undeclared type 'TableViewCellConfigure'.

I tried another way. Instead of declaring a variable for the closure, I declared it as a typealias.

typealias TableViewCellConfigure = (cell: AnyObject, item: AnyObject) -> Void

But then I get a new error at the same line above saying 'TableViewDataSource' does not have a member named 'TableViewCellConfigure'.

Can anyone please help me out to resolve this?

Thank you.

Solution

The problem is that you have confused TableViewDataSource with TableViewCellConfigure in your init. This compiles fine for me:

typealias TableViewCellConfigure = (cell: AnyObject, item: AnyObject) -> Void // At outer level

class TableViewDataSource: NSObject/*, UITableViewDataSource */ { // Protocol commented out, as irrelevant to question

    var items: [AnyObject]
    var cellIdentifier: String
    var tableViewCellConfigure: TableViewCellConfigure // NB case

    init(items: [AnyObject], cellIdentifier: String!, configureCell: TableViewCellConfigure) {
        self.items = items
        self.cellIdentifier = cellIdentifier
        self.tableViewCellConfigure = configureCell

        super.init()
    }

}

Note also that you used uppercase for the property name tableViewCellConfigure - I've changed it, as it was confusing me, and, possibly, you!