SKLabelNode 随时更新答案

【问题标题】：SKLabelNode update at touchSKLabelNode 随时更新
【发布时间】：2014-08-14 10:28:27
【问题描述】：

我正试图找出奇怪行为的原因。我的 SpriteKit 场景有一个 SKLabelNode 作为属性。 SKLabelNode 在名为 levelSelected 的方法中初始化：

 -(void)levelSelected{
    SKSpriteNode* bar = [SKSpriteNode spriteNodeWithColor:[UIColor colorWithHue:0.566f saturation:0.787f brightness:0.792f alpha:1] size:CGSizeMake(self.frame.size.width,60)];
    bar.anchorPoint = CGPointMake(0, 0);
    bar.position = CGPointMake(0, 50);
    float space = (self.size.width - 45*6) / 7;
    SKSpriteNode* letterBox = [SKSpriteNode spriteNodeWithImageNamed:@"letter_box_def"];
    letterBox.anchorPoint = CGPointMake(0.5, 0.5);
    letterBox.position = CGPointMake((space+((space + 45)*2)+22.5), 30);
    [bar addChild:letterBox];
    self.gl2 = [SKLabelNode labelNodeWithFontNamed:@"Arial"];
    self.gl2.fontColor = [SKColor blackColor];
    self.gl2.verticalAlignmentMode = SKLabelVerticalAlignmentModeCenter;
    self.gl2.fontSize = 30;
    self.gl2.text = @"";
    NSLog(@"%@", self.gl2);
    [letterBox addChild:self.gl2];
    [self addChild:bar];
    self.gl2.text = @"D";
    }

正如预期的那样，在运行时，节点显示“D”。我的触摸方法如下：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"Called touchesBegan");
    NSLog(@"Node : %@", self.gl2);
    NSLog(@"Text : %@", self.gl2.text);
    self.gl2.text = @"k";
    NSLog(@"Node : %@", self.gl2);
    NSLog(@"Text : %@", self.gl2.text);
    }

现在，只需轻轻一按，标签就会从屏幕上消失。日志显示：

2014-08-14 06:15:34.841 Guess[3125:607363] Called touchesBegan
2014-08-14 06:15:34.842 Guess[3125:607363] Node : <SKLabelNode> name:'(null)' text:'D' fontName:'Arial' position:{0, 0}
2014-08-14 06:15:34.843 Guess[3125:607363] Text : D
2014-08-14 06:15:34.846 Guess[3125:607363] Node : <SKLabelNode> name:'(null)' text:'k' fontName:'Arial' position:{0, 0}
2014-08-14 06:15:34.847 Guess[3125:607363] Text : k

我尝试过使用另一种方法，从 levelSelected 方法调用：

-(void)levelSelected{
    SKSpriteNode* bar = [SKSpriteNode spriteNodeWithColor:[UIColor colorWithHue:0.566f saturation:0.787f brightness:0.792f alpha:1] size:CGSizeMake(self.frame.size.width,60)];
    bar.anchorPoint = CGPointMake(0, 0);
    bar.position = CGPointMake(0, 50);
    float space = (self.size.width - 45*6) / 7;
    SKSpriteNode* letterBox = [SKSpriteNode spriteNodeWithImageNamed:@"letter_box_def"];
    letterBox.anchorPoint = CGPointMake(0.5, 0.5);
    letterBox.position = CGPointMake((space+((space + 45)*2)+22.5), 30);
    [bar addChild:letterBox];
    self.gl2 = [SKLabelNode labelNodeWithFontNamed:@"Arial"];
    self.gl2.fontColor = [SKColor blackColor];
    self.gl2.verticalAlignmentMode = SKLabelVerticalAlignmentModeCenter;
    self.gl2.fontSize = 30;
    self.gl2.text = @"";
    NSLog(@"%@", self.gl2);
    [letterBox addChild:self.gl2];
    [self addChild:bar];
    self.gl2.text = @"D";
    [self touchedSomething];
}
-(void)touchedSomething {
    NSLog(@"Called touchedSomething");
    NSLog(@"Node : %@", self.gl2);
    NSLog(@"Text : %@", self.gl2.text);
    self.gl2.text = @"k";
    NSLog(@"Node : %@", self.gl2);
    NSLog(@"Text : %@", self.gl2.text);
}

这很好用，将 D 替换为 k，生成日志：

2014-08-14 06:20:09.934 Guess[3132:608100] Called touchedSomething
2014-08-14 06:20:09.935 Guess[3132:608100] Node : <SKLabelNode> name:'(null)' text:'D' fontName:'Arial' position:{0, 0}
2014-08-14 06:20:09.935 Guess[3132:608100] Text : D
2014-08-14 06:20:09.938 Guess[3132:608100] Node : <SKLabelNode> name:'(null)' text:'k' fontName:'Arial' position:{0, 0}
2014-08-14 06:20:09.939 Guess[3132:608100] Text : k

但如果我从 levelSelected 中删除 [self touchSomething] 调用并将其添加到 touchesBegan，它将不起作用，并且标签将再次从屏幕上消失。

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    NSLog(@"Called touchesBegan");
    [self touchedSomething];
}

-(void)touchedSomething {
    NSLog(@"Called touchedSomething");
    NSLog(@"Node : %@", self.gl2);
    NSLog(@"Text : %@", self.gl2.text);
    self.gl2.text = @"k";
    NSLog(@"Node : %@", self.gl2);
    NSLog(@"Text : %@", self.gl2.text);
}

2014-08-14 06:24:49.492 Guess[3145:609098] Called touchesBegan
2014-08-14 06:24:49.493 Guess[3145:609098] Called touchedSomething
2014-08-14 06:24:49.494 Guess[3145:609098] Node : <SKLabelNode> name:'(null)' text:'D' fontName:'Arial' position:{0, 0}
2014-08-14 06:24:49.494 Guess[3145:609098] Text : D
2014-08-14 06:24:49.498 Guess[3145:609098] Node : <SKLabelNode> name:'(null)' text:'k' fontName:'Arial' position:{0, 0}
2014-08-14 06:24:49.498 Guess[3145:609098] Text : k

感谢您的帮助！

【问题讨论】：

标签： ios objective-c sprite-kit touchesbegan sklabelnode

【解决方案1】：

嗯，我能够解决它（有点）。为标签定义一个 zPosition 来修复它。为什么它在某些情况下可以正常工作，但在其他情况下不能正常工作，这仍然是一个谜。

【讨论】：