ios - 在 skview 中创建按钮以指向不同的场景

Question

我是第一次尝试 Sprite 套件。只是为了说明这一点，我已经阅读了文档，但我还不能安静地掌握创建多个按钮的想法。我可以创建按钮。它们出现在我的 View 中，但我无法将功能附加到它们以指向不同的 View 。这是我用于创建按钮等的代码:

#import "Levels.h"
#import "MyScene.h"
#import "MyScene1.h"

@interface Levels ()
@property BOOL contentCreated;
@end

@implementation Levels

- (void)didMoveToView: (SKView *) view
{
    if (!self.contentCreated)
    {
        [self createSceneContents];
        self.contentCreated = YES;
    }
}

- (void)createSceneContents
{
    self.backgroundColor = [SKColor blueColor];
    self.scaleMode = SKSceneScaleModeAspectFit;
    [self addChild: [self button]];
    [self addChild: [self button1]];
    [self addChild: [self button2]];
    [self addChild: [self button3]];
}

- (SKLabelNode *)button
{
    SKLabelNode *button = [SKLabelNode labelNodeWithFontNamed:@"Chalkduster"];
    button.text = @"Level 1";
    button.fontSize = 42;
    button.position = CGPointMake(CGRectGetMidX(self.frame),250);
    button.name = @"button";
    return button;
}
- (SKLabelNode *)button1
{
    SKLabelNode *button1 = [SKLabelNode labelNodeWithFontNamed:@"Chalkduster"];
    button1.text = @"Level 2";
    button1.fontSize = 42;
    button1.position = CGPointMake(CGRectGetMidX(self.frame),200);
    button1.name = @"button1";
    return button1;
}
- (SKLabelNode *)button2
{
    SKLabelNode *button2 = [SKLabelNode labelNodeWithFontNamed:@"Chalkduster"];
    button2.text = @"Level 3";
    button2.fontSize = 42;
    button2.position = CGPointMake(CGRectGetMidX(self.frame),150);
    button2.name = @"button2";
    return button2;
}
- (SKLabelNode *)button3
{
    SKLabelNode *button3 = [SKLabelNode labelNodeWithFontNamed:@"Chalkduster"];
    button3.text = @"Level 4";
    button3.fontSize = 42;
    button3.position = CGPointMake(CGRectGetMidX(self.frame),100);
    button3.name = @"button3";
    return button3;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];
    SKNode *button = [self nodeAtPoint:location];
    SKNode *button1 = [self nodeAtPoint:location];
    SKNode *button2 = [self nodeAtPoint:location];
    SKNode *button3 = [self nodeAtPoint:location];
    //if fire button touched, bring the rain
    if (button != nil)
    {
        button.name = nil;
        SKAction *moveUp = [SKAction moveByX: 0 y: 100.0 duration: 0.5];
        SKAction *zoom = [SKAction scaleTo: 2.0 duration: 0.25];
        SKAction *pause = [SKAction waitForDuration: 0.5];
        SKAction *fadeAway = [SKAction fadeOutWithDuration: 0.25];
        SKAction *remove = [SKAction removeFromParent];
        SKAction *moveSequence = [SKAction sequence:@[moveUp, zoom, pause, fadeAway, remove]];
        [button runAction: moveSequence completion:^{
            SKScene *spaceshipScene  = [[MyScene alloc] initWithSize:self.size];
            SKTransition *doors = [SKTransition doorsOpenVerticalWithDuration:0.5];
            [self.view presentScene:spaceshipScene transition:doors];
        }];
    }

    if (button1 != nil)
    {
        button1.name = nil;
        SKAction *moveUp = [SKAction moveByX: 0 y: 100.0 duration: 0.5];
        SKAction *zoom = [SKAction scaleTo: 2.0 duration: 0.25];
        SKAction *pause = [SKAction waitForDuration: 0.5];
        SKAction *fadeAway = [SKAction fadeOutWithDuration: 0.25];
        SKAction *remove = [SKAction removeFromParent];
        SKAction *moveSequence1 = [SKAction sequence:@[moveUp, zoom, pause, fadeAway, remove]];
        [button runAction: moveSequence1 completion:^{
            SKScene *spaceshipScene1  = [[MyScene1 alloc] initWithSize:self.size];
            SKTransition *doors1 = [SKTransition doorsOpenVerticalWithDuration:0.5];
            [self.view presentScene:spaceshipScene1 transition:doors1];
        }];
    }
    if (button2 != nil)
    {
        button2.name = nil;
        SKAction *moveUp = [SKAction moveByX: 0 y: 100.0 duration: 0.5];
        SKAction *zoom = [SKAction scaleTo: 2.0 duration: 0.25];
        SKAction *pause = [SKAction waitForDuration: 0.5];
        SKAction *fadeAway = [SKAction fadeOutWithDuration: 0.25];
        SKAction *remove = [SKAction removeFromParent];
        SKAction *moveSequence2 = [SKAction sequence:@[moveUp, zoom, pause, fadeAway, remove]];
        [button runAction: moveSequence2 completion:^{
            SKScene *spaceshipScene2  = [[MyScene alloc] initWithSize:self.size];
            SKTransition *doors2 = [SKTransition doorsOpenVerticalWithDuration:0.5];
            [self.view presentScene:spaceshipScene2 transition:doors2];
        }];
    }
    if (button3 != nil)
    {
        button3.name = nil;
        SKAction *moveUp = [SKAction moveByX: 0 y: 100.0 duration: 0.5];
        SKAction *zoom = [SKAction scaleTo: 2.0 duration: 0.25];
        SKAction *pause = [SKAction waitForDuration: 0.5];
        SKAction *fadeAway = [SKAction fadeOutWithDuration: 0.25];
        SKAction *remove = [SKAction removeFromParent];
        SKAction *moveSequence3 = [SKAction sequence:@[moveUp, zoom, pause, fadeAway, remove]];
        [button runAction: moveSequence3 completion:^{
            SKScene *spaceshipScene3  = [[MyScene alloc] initWithSize:self.size];
            SKTransition *doors3 = [SKTransition doorsOpenVerticalWithDuration:0.5];
            [self.view presentScene:spaceshipScene3 transition:doors3];
        }];
    }
}
@end

使用上面的代码，当我按下第一个按钮时，场景出现，然后卡住，哦，项目会崩溃。我想这与我声明按钮的方式有关。如果我注释掉 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 中的按钮 1 到 3方法，它确实可以很好地加载场景并且没有崩溃。有人可以帮我解决这个问题。我知道我没有以正确的方式声明其他三个按钮，但我似乎无法正确实现它们。

Answer 1

您应该只在 - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event 中分配一次节点然后根据其名称检查它是哪个节点:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *touch = [touches anyObject];
    CGPoint location = [touch locationInNode:self];
    SKNode *node = [self nodeAtPoint:location];

    if ([node.name isEqualToString:@"button"]) {
        [self runButtonActionOnNode:node];
    }
    else if ([node.name isEqualToString:@"button1"]) {
        [self runButtonActionOnNode:node];
    }
    else if  ([node.name isEqualToString:@"button2"]) {
         [self runButtonActionOnNode:node];
    }
    else if ([node.name isEqualToString:@"button3"]) {
         [self runButtonActionOnNode:node];
    }
}

我还将您的操作代码放入一个方法中，以减少重复:

-(void)runButtonActionOnNode:(SKNode*) node{
    node.name = nil;
    SKAction *moveUp = [SKAction moveByX: 0 y: 100.0 duration: 0.5];
    SKAction *zoom = [SKAction scaleTo: 2.0 duration: 0.25];
    SKAction *pause = [SKAction waitForDuration: 0.5];
    SKAction *fadeAway = [SKAction fadeOutWithDuration: 0.25];
    SKAction *remove = [SKAction removeFromParent];
    SKAction *moveSequence = [SKAction sequence:@[moveUp, zoom, pause, fadeAway, remove]];
    [node runAction: moveSequence completion:^{
         SKScene *spaceshipScene  = [[MyScene alloc] initWithSize:self.size];
         SKTransition *doors = [SKTransition doorsOpenVerticalWithDuration:0.5];
         [self.view presentScene:spaceshipScene transition:doors];
    }];
}