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我嘗試使這兩個節點和所述代碼之間的接觸SKPhysicsBody接觸低於：與SKSpriteNode
SKTexture *bgTexttureRiverLeft = [SKTexture textureWithImageNamed:@"River_Left_Main"];
bgTexttureRiverLeft.filteringMode = SKTextureFilteringNearest;
SKSpriteNode *spriteRiverLeft = [SKSpriteNode spriteNodeWithTexture:bgTexttureRiverLeft];
spriteRiverLeft.texture.filteringMode = SKTextureFilteringNearest;
spriteRiverLeft.anchorPoint = CGPointZero;
spriteRiverLeft.position = CGPointZero;
spriteRiverLeft.zPosition = -10;
spriteRiverLeft.name = @"River_Left_Main";
spriteRiverLeft.size = CGSizeMake(spriteRiverLeft01.size.width *0.8, _screenSize.height);
spriteRiverLeft.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:CGSizeMake(spriteRiverLeft.size.width*1.85, spriteRiverLeft.size.height*2)];
spriteRiverLeft.physicsBody.categoryBitMask = river_left_Category;
spriteRiverLeft.physicsBody.collisionBitMask = kajakCategory;
spriteRiverLeft.physicsBody.contactTestBitMask = kajakCategory ;
spriteRiverLeft.physicsBody.dynamic = YES;
spriteRiverLeft.physicsBody.allowsRotation = YES;
[self addChild:spriteRiverLeft];
由於SKTexture River_Left_Main是不在一條直線上（加捻河流），皮艇和邊緣之間的接觸河是完美的一些地方，並不是完美的另一個地方（太晚或太早）。
我的問題是如何使接觸更精確？先謝謝你。