didBeginContact :( SKPhysicsContact *）联系人未被调用 [英] didBeginContact:(SKPhysicsContact *)contact not invoked

问题描述

我创建了 SKScene 继承的类。
问题是关于物理体法的接触

I have created SKScene inherited class. Problem is that on contact of physics body method

- (void)didBeginContact:(SKPhysicsContact *)contact 

未被调用
解决方案可能很简单，但作为初学者使用精灵工具包我坚持这个。

is not invoked solution may be simple but as beginner with sprite kit i am stuck with this.

以下是代码

#import "MyScene.h"
@interface MyScene ()
@property BOOL contentCreated;
@end
@implementation MyScene
- (id)initWithSize:(CGSize)size {
    self = [super initWithSize:size];
    if (self) {
        self.physicsWorld.contactDelegate = self;
        self.physicsBody = [SKPhysicsBody bodyWithEdgeLoopFromRect:self.frame];
    }
    return self;
}
- (void)didMoveToView:(SKView *)view
{
    if (!self.contentCreated) {
        [self buildWorld];
        self.physicsWorld.contactDelegate = self;
    }
}

#pragma mark - World Building
- (void)buildWorld {
    NSLog(@"Building the world");
    SKSpriteNode * sprite1 = [[SKSpriteNode alloc] initWithColor:[SKColor grayColor] size:CGSizeMake(100,100)];
    sprite1.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(100,100)];
    sprite1.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame) +100);

    SKSpriteNode * sprite2 = [[SKSpriteNode alloc] initWithColor:[SKColor grayColor] size:CGSizeMake(100,100)];
    sprite2.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(100,100)];
    sprite2.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame) - 100);


    [self addChild:sprite1];
    [self addChild:sprite2];
}
- (void)didBeginContact:(SKPhysicsContact *)contact
{
    NSLog(@"contact");
}

@end

提前致谢。

推荐答案

来自 SKPhysicsWorld 文档：

From the SKPhysicsWorld documentation:

当两个物理实体重叠并且其中一个
物理实体具有 contactTestBitMask 属性时，会创建一个联系人与
重叠另一个机构的 categoryBitMask 属性。

A contact is created when two physics bodies overlap and one of the physics bodies has a contactTestBitMask property that overlaps with the other body’s categoryBitMask property.

你有为物理机构分配一个 categoryBitMask 和一个 contactTestBitMask 。您想首先创建类别：

You have to assign the physics bodies a categoryBitMask and a contactTestBitMask. You want to first create your categories:

static const uint32_t sprite1Category = 0x1 << 0;
static const uint32_t sprite2Category = 0x1 << 1;

接下来，分配类别和联系测试位掩码：

Next, assign the category and contact test bit masks:

sprite1.physicsBody.categoryBitMask = sprite1Category;
sprite1.physicsBody.contactTestBitMask = sprite2Category;

sprite2.physicsBody.categoryBitMask = sprite2Category;
sprite2.physicsBody.contactTestBitMask = sprite1Category;

请注意 SKPhysicsBody 文档：

Note from the SKPhysicsBody documentation:

为了获得最佳性能，只需在联系人掩码中设置您感兴趣的
交互位。

For best performance, only set bits in the contacts mask for interactions you are interested in.

这篇关于didBeginContact :( SKPhysicsContact *）联系人未被调用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！