Question

所以我试图在游戏中实现一种方法，如果玩家的手指在y轴或更低的位置上触摸屏幕，那么SKAction将运行以移动角色精灵，如果他们的手指触摸50以上，另一个动作将运行精灵向上移动。我不知道你怎么认识到触摸和握住它。请帮助。

Answer 1

您需要捕获用户的触摸事件才能将其关闭。我建议查看RayWenderlich提供的优秀教程：Animating Textures and Moving Them With Touch Events

如果您没有时间，那么这就是您的代码的样子：

首先，您需要的知识是两个最通用的触摸事件是： - （void）touchesEnded：（NSSet *）触及withEvent：（UIEvent *）事件和： - （void）touchesBegan：（NSSet *）触及withEvent：（UIEvent *）事件

基本上，当用户将手指放在屏幕上时会调用触摸开始方法，而当用户将手指从屏幕上移开时，将触发触摸结束方法。

对于这个例子，我将使用touchesEnded，但如果你愿意，可以随意更改它，就像切换＆＃34;结束＆＃34;一样简单。用＆＃34;开始＆＃34;。

我要向您展示的所有代码都将在场景实现文件中进行：

如果您只想让精灵在某个点以上向上移动而在某个点以下向下移动，请使用以下内容：

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    //capture the location of the touch
    CGPoint location = [[touches anyObject] locationInNode:self];

    //used to hold the location to travel
    CGPoint moveLocation;

    //check if the Y location is less than 50
    if(location.y < 50)
    {
        //the the location to the bottom of the screen
         moveLocation = CGPointMake(sprite.position.x, 0);
    }
    //and then if its more than 50
    else
    {
        //set the locaiton to the top of the screen
        moveLocation = CGPointMake(sprite.position.x, self.frame.size.height);
    }

    //move the sprite

    //Check if their already moving
    if(sprite actionForKey:@"moving")
    {
        //If they are stop them so they can move in the new direction
        [sprite removeActionForKey:@"moving"];
    }
    SKAction *moveAction = [SKAction moveTo:location duration:5.0f];

    //remember to give the action a key so that we can check for it during the above if statement
    [sprite runAction:moveAction withKey:@"moving"];
}

你有它。唯一的缺陷是它总是需要5秒才能到达该位置，无论您与它的距离如何，请继续阅读，如果您想要提示如何纠正它，或者您想了解如何让雪碧旅行到任何地方触摸屏幕上的位置。

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    //capture the location of the touch
    CGPoint location = [[touches anyObject] locationInNode:self];

    //move the sprite

    //Check if their already moving
    if(sprite actionForKey:@"moving")
    {
        //If they are stop them so they can move in the new direction
        [sprite removeActionForKey:@"moving"];
    }
    SKAction *moveAction = [SKAction moveTo:location duration:5.0f];

    //remember to give the action a key so that we can check for it during the above if statement
    [sprite runAction:moveAction withKey:@"moving"];
}

该代码将使精灵在5秒内移动到屏幕上触摸的位置。只记得替换＆＃34; sprite＆＃34;的实例。使用SKSpriteNode变量的名称。对于更复杂的运动，请尝试以下方法：

-(void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
    //capture the location of the touch
    CGPoint location = [[touches anyObject] locationInNode:self];
    //set the velocity of the subject
    float velocity = self.frame.size.width/3.0;
    //The above will ensure that it will take the sprite 3 seconds to travel the distance of the screen

    //Determine the difference between the point touched and the sprites position
    CGPoint moveDifference = CGPointMake(location.x - sprite.position.x, location.y - sprite.position.y);

    //Use pythagorean theorem to figure out the actual length to move
    float distanceToMove = sqrtf(moveDifference.x * moveDifference.x + moveDifference.y*moveDifference.y);

    //Use the distance to travel and the velocity to determine how long the sprite should move for
    float moveDuration = distanceToMove / velocity;

    //and finally move the sprite
    if(sprite actionForKey:@"moving")
    {
        [sprite removeActionForKey:@"moving"];
    }
    SKAction *moveAction = [SKAction moveTo:location duration:moveDuration];

    [sprite runAction:moveAction withKey:@"moving"];
}

这将设置精灵的速度，确定行程的长度，以及到达新位置所需的时间。

如果您想涉及纹理，我强烈建议您阅读我提供的链接。

根据要求，我很乐意提供使用力来控制移动速度的例子。

我希望有帮助，让我知道如果有任何问题我不能处理我可以运行代码的位置，但我确信它没问题。

Spritekit如何根据触摸和保持的位置运行SKAction

1 个答案: