Question

这就是我的scene.m的样子：

#import "ERGMyScene.h"
#import "ERGBackground.h"
#import "ERGPlayer.h"

@implementation ERGMyScene

-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
    self.currentBackground = [ERGBackground generateNewBackground];
    self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
    [self addChild:self.currentBackground];}


ERGPlayer *player = [[ERGPlayer alloc] init];
player.position = CGPointMake(225, 100);
player.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:10];
[self addChild:player];

return self;
}


-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
SKAction *moveUp = [SKAction moveBy:CGVectorMake(0, 200) duration:0.3];
ERGPlayer *player = (ERGPlayer*) [self childNodeWithName:playerName];
[player runAction:moveUp];
}

-(void)update:(CFTimeInterval)currentTime {
CFTimeInterval timeSinceLast = currentTime - self.lastUpdateTimeInterval;
self.lastUpdateTimeInterval = currentTime;
if (timeSinceLast > 1) { // more than a second since last update
    timeSinceLast = 1.0 / 60.0; }
}
@end

我在ViewController（0，-5）中启用了重力，当点击屏幕时，我的图像执行它想要做的事情，上升200点然后由于重力而下降。第一次点击使角色上升200，但是当图像仍在空中时，每次后续点击都不会使图像上升200，这是我想要它做的。我认为这是因为重力已经作用于图像，导致它不会上升200.当点击使图像上升了整整200时，有没有办法重置图像的重力？

Answer 1

使用applyImpulse代替SKAction：

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    ERGPlayer *player = (ERGPlayer*) [self childNodeWithName:playerName];
    [player.physicsBody applyImpulse:CGVectorMake(0, ...)]
}

SpriteKit重力实现

1 个答案: