场景间传递整数，iphone游戏sprite-kit

Question

我有一个场景，用户在游戏中选择关卡，然后我想切换到用户选择关卡的游戏场景。我想创建具有正确关卡的游戏场景，但要做到这一点，我需要将一个整数传递给游戏场景，这样我就知道该加载哪个关卡了。

我的问题是，我该如何做到这一点？我看过节点的userdata属性，但不知道如何使用它来完成我想要的功能。任何帮助都将深表感谢。

Answer 1

在关卡选择场景内调用[self.view presentScene:scene transition:transition]时，首先使用关卡编号设置新场景。所以：

//GameScene.h
//This is the public interface for your game scene
@import SpriteKit;
@interface GameScene : SKScene
@property (nonatomic, assing)NSInteger levelNumber;
@end

然后

//Level Selection Scen
//Select.m
#import "GameScene.h"
... Rest of your code
User selects level and you prepare for transition and call
- (void)transitionToLevel:(NSInteger)level{
    GameScene *destinationScene = [[GameScene alloc] initWithSize:self.size];
    destinationScene.levelNumber = level;
    SKTransition *transition = //Set up transition here
    [self.view presentScene:destinationScene transition:transition];
}    

在你的游戏场景的实现中

//GameScene.m
#import "GameScene.h"
@implementation GameScene
-(id)initWithSize:(CGSize){
    if (self.levelNumber == 1){
        [self playLevelOne]; //Where this is where you play your game
    }
    else if (self.levelNumber == 2){
        [self playLevelTwo];
    }
}
- (void)playLevelOne{
    //Level Implementation
}
- (void)playLevelTwo{
    //Level Implementation
}
@end

您将对计划支持的每个级别执行此操作

Answer 2

    // First Scene
    NSUserDefaults.standardUserDefaults().setInteger(12345, forKey:"SCORE")

    // Second Scene
    if let myScore: AnyObject = NSUserDefaults.standardUserDefaults().objectForKey("SCORE") {
        println(myScore)
        finalScore = myScore as IntegerLiteralType
    }