Physics Body 边缘 IOS8，Sprite Kit

Posted 2023-03-08

【中文标题】Physics Body 边缘 IOS8，Sprite Kit

【英文标题】：Physics Body edges IOS8, Sprite Kit

【发布时间】：2014-10-17 10:46:30

【问题描述】：

所以按照 ios 游戏教程，它的 IO7 为 8 还不是很多。

下面的代码应该是一个弹跳的球，但只在屏幕的顶部和底部弹跳，如果它碰到侧边，球就会离开屏幕

#import "GameScene.h"

@implementation GameScene

-(void)didMoveToView:(SKView *)view 
    /* Setup your scene here */

self.backgroundColor =[SKColor  whiteColor];
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
self.physicsWorld.gravity = CGVectorMake(0, 0);

SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed:@"ball"];

ball.position = CGPointMake(CGRectGetMidX(self.frame),CGRectGetMidY(self.frame));

ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:ball.frame.size.width/2];

//ball.physicsBody.friction = 0;
ball.physicsBody.linearDamping = 0;
ball.physicsBody.restitution = 1;


[self addChild:ball];

CGVector myVector = CGVectorMake(0, 5);
[ball.physicsBody applyImpulse:myVector];




-(void)update:(CFTimeInterval)currentTime 
    /* Called before each frame is rendered */


@end

这里必须有一些简单的东西，但我似乎无法找到堆栈溢出的答案

【参考方案1】：

使用 NSLog 检查视图的大小：NSLog(@"%f,%f",self.size.width,self.size.height);

SpriteKit 存在一个问题，导致视图尺寸与您的预期不一致。如果这是您的情况，请确保将视图的大小更改为正确的大小：

-(void)didMoveToView:(SKView *)view 
/* Setup your scene here */

self.size = self.view.frame.size;
self.backgroundColor =[SKColor  whiteColor];
self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
self.physicsWorld.gravity = CGVectorMake(0, 0);

SKSpriteNode *ball = [SKSpriteNode spriteNodeWithImageNamed:@"ball"];

ball.position = CGPointMake(CGRectGetMidX(self.frame),CGRectGetMidY(self.frame));

ball.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:ball.frame.size.width/2];

//ball.physicsBody.friction = 0;
ball.physicsBody.linearDamping = 0;
ball.physicsBody.restitution = 1;


[self addChild:ball];

CGVector myVector = CGVectorMake(50, 20);
[ball.physicsBody applyImpulse:myVector];




-(void)update:(CFTimeInterval)currentTime 
/* Called before each frame is rendered */