Swift and Objective C Delegate calling - Data type issue

Question

I try to use a Swift class in Objective C and let the Objective C class "GameScene" receive delegate calls from the swift class. But from within the swift class I get the error "Cannot Invoke drawTopEdge with an argument list of type '(int, col:int)'

    //above in the code
    var maze:[[Int]]!
////////////////
     func display() { //this is in the swift class
        for i in 0..<y {
            // Draw top edge
            for j in 0..<x {
                print((maze[j][i] & 1) == 0 ? "+---" : "+   ")
                if ((maze[j][i] & 1) == 0) {
                   delegate!.drawTopEdge(j, col: i) //Error see picture attached and above
                }
            }


    //This is in the GameScene class
    -(void)drawTopEdge:(NSUInteger)r col:(int)c; 
    -(void)drawLeftEdge:(NSUInteger)r col:(int)c;
    -(void)drawBottomEdge:(NSUInteger)r col:(int)c;

http://i.stack.imgur.com/dVLEe.png

int is different than nsuinteger. Did you try by making all int? — Teja Nandamuri
Ah thanks for the notice. I did change it but I still get the same error. — cocos2dbeginner

Rob Napier Rob Napier · Accepted Answer · 2015-07-30T19:50:33

-(void)drawTopEdge:(NSUInteger)r col:(int)c;

NSUInteger becomes Int in Swift. However, int becomes CInt. Ideally you should change your signatures to use NS* based integers so that Swift can easily bridge them. But otherwise, you can cast at the calling point:

delegate!.drawTopEdge(j, col: CInt(i))

See Dealing with C APIs and Foundation Data Types for more.

Swift and Objective C Delegate calling - Data type issue

1 Answers