SpriteKit - Adding a timer - ios

Question

I'd like to add a timer to a simple SpriteKit game. Using the code suggested in an existing answer ("Spritekit - Creating a timer") causes 5 errors (s. comments below). Maybe there are other ideas, too!
Thanks a lot!
This is my .m file:
#implementation GameScene {
BOOL updateLabel;
SKLabelNode *timerLabel;
}
int timer;
- (id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
self.backgroundColor = [SKColor whiteColor];
timer = 0;
updateLabel = false;
timerLabel = [SKLabelNode labelNodeWithFontNamed:#"Chalkduster"];
timerLabel.text = #"0";
timerLabel.fontSize = 48;
timerLabel.fontColor = [SKColor greenColor];
timerLabel.position = CGPointMake(700,50);
[self addChild: timerLabel];
}
return self;
}
-(void) didMoveToView:(SKView *)view {
}
The following code gives me the trouble:
id wait = [SKAction waitForDuration:1.0];//Redefinition of 'wait' as different kind of symbol
id run = [SKAction runBlock:^{//Initializer element is not a compile-time constant
timer ++;
updateLabel = true;
}];
[node runAction:[SKAction repeatActionForever:[SKAction sequence:#[wait, run]]];//1. Expected identifier or '('; 2. Use of undeclared identifier 'node'; 3. Collection element of type 'pid_t (int *)' is not an Objective-C object
-(void)update:(CFTimeInterval)currentTime {
if(updateLabel == true){
timerLabel.text = [NSString stringWithFormat:#"%i",timer];
updateLabel = false;
}
}
#end

Answer 1

int timer = 0;
SKLabelNode timerLabel;
- (id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
SKAction *wait = [SKAction waitForDuration:1];
SKAction *performSelector = [SKAction performSelector:#selector(timerLabel) onTarget:self];
SKAction *removeChild = [SKAction runBlock:^{
[timerLabel removeFromParent];
}];
SKAction *increaseTimer = [SKAction runBlock:^{
timer++;
}];
SKAction *sequence = [SKAction sequence:#[removeChild, performSelector, wait, increaseTimer]];
SKAction *repeat = [SKAction repeatActionForever:sequence];
[self runAction:repeat];
}
return self;
}
-(void)timerLabel
{
timerLabel = [SKLabelNode labelNodeWithFontNamed:#"Chalkduster"];
timerLabel.text = [NSString stringWithFormat:#"%i", timer];
timerLabel.fontSize = 48;
timerLabel.fontColor = [SKColor greenColor];
timerLabel.position = CGPointMake(700,50);
[self addChild: timerLabel];
}
Try to call with perform selector. I hope this will work.I didn't test.