SpriteKit-添加计时器

Question

我想在一个简单的SpriteKit游戏中添加一个计时器。 使用现有答案中建议的代码（“ Spritekit-创建计时器”）会导致5个错误（下面的注释）。 也许还有其他想法！

非常感谢！

这是我的.m文件：

@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 {

}

以下代码给我带来了麻烦：

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];
}

尝试使用表演选择器致电。 我希望这会起作用。我没有测试。