我已经创建了SKScene继承类.
问题是接触物理方法
问题是接触物理方法
- (void)didBeginContact:(SKPhysicsContact *)contact
没有被调用
解决方案可能很简单,但作为初学者与精灵套件我被卡住了这一点.
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.
解决方法
从
SKPhysicsWorld文档：
A contact is created when two physics bodies overlap and one of the
physics bodies has acontactTestBitMaskproperty that overlaps with
the other body’scategoryBitMaskproperty.
你必须为物理实体分配一个CategoryBitMask和一个contactTestBitMask.你想先创建你的类别：
static const uint32_t sprite1Category = 0x1 << 0; static const uint32_t sprite2Category = 0x1 << 1;
接下来,分配类别和联系人测试位掩码：
sprite1.physicsBody.categoryBitMask = sprite1Category; sprite1.physicsBody.contactTestBitMask = sprite2Category; sprite2.physicsBody.categoryBitMask = sprite2Category; sprite2.physicsBody.contactTestBitMask = sprite1Category;
SKPhysicsBody文档注：
For best performance,only set bits in the contacts mask for interactions you are interested in.
