SKAction Perform Selector syntax error

Question

Using a SKAction sequence I am trying to add a delay and then call a method with two parameters, however I keep getting the following (new to obj c so could be something simple):

// code 
SKAction *fireAction = [SKAction sequence:@[[SKAction waitForDuration:1.5 withRange:0],
                                [SKAction performSelector:@selector(addExplosion:firstBody.node.position  andTheName: @"whiteExplosion") onTarget:self]]];

// error

Expected ':'

Method declaration

-(void) addExplosion : (CGPoint) position andTheName :(NSString *) explosionName{

When I substitute a method call without parameters seems to work fine.

Any input appreciated.

Nate Hat Nate Hat · Accepted Answer · 2014-11-01T01:20:51

Use [SKAction runBlock:^{}] instead of a selector.

I would use selectors if the method has no parameters. Using a block is much more powerful. But beware of how to use them as it may keep expected deleted objects alive.

__weak typeof(self) weakself = self;
SKAction *fireAction = [SKAction sequence:@[
                        [SKAction waitForDuration:1.5 withRange:0],
                        [SKAction runBlock:^{
    [weakself addExplosion:position andTheName:explosionName];
}]]];

Or use the completion block:

__weak typeof(self) weakself = self;
SKAction *fireAction = [SKAction waitForDuration:1.5 withRange:0];

[someNode runAction:fireAction completion:^{
    [weakself addExplosion:position andTheName:explosionName];
}];

SKAction Perform Selector syntax error

2 Answers