将 SKSpriteNode 与类别一起使用时，未找到精灵的纹理且未显示精灵

Question

我开始使用 SKSpriteNode 类别系统来扩展 SKSpriteNode 的基本功能，现在场景中缺少通过编辑器添加到 .sks 场景的精灵（不是以编程方式添加到场景的精灵，在运行）。当我在 .sks 上记录一些精灵时，我可以看到它们的正确位置和比例参数，但在 XCode 的调试控制台中纹理总是 ['nil']。例如，当我在 GameScene1.sks 的场景编辑器上的静态 SKNoe 中记录名为 "house1" 的元素时，就会发生这种情况（见下面的 NSLog 行）。在场景编辑器上，我可以看到所有元素（包括 house1 元素）都很好，但是当我启动项目时，显示了添加到该 .sks 文件的 none 个精灵。这是相关代码：

GameScene 头文件是：

//GameScene.h

#import "Hero.h"
#import "SKSpriteNode+StaticLevelElement.h"

@interface GameScene : SKScene <SKPhysicsContactDelegate>

-(void) initStaticLevelElements;

@end

GameScene 实现文件是：

//GameScene.m
#import "SKSpriteNode+StaticLevelElement.h" 

@implementation SKScene (Unarchive)

+ (instancetype)unarchiveFromFile:(NSString *)file {
    /* Retrieve scene file path from the application bundle */
    NSString *nodePath = [[NSBundle mainBundle] pathForResource:file ofType:@"sks"];
    /* Unarchive the file to an SKScene object */
    NSData *data = [NSData dataWithContentsOfFile:nodePath
                                      options:NSDataReadingMappedIfSafe
                                        error:nil];
    NSKeyedUnarchiver *arch = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
    [arch setClass:self forClassName:@"SKScene"];
    SKScene *scene = [arch decodeObjectForKey:NSKeyedArchiveRootObjectKey];
    [arch finishDecoding];

    return scene;
}  

@end

@implementation GameScene

-(void)didMoveToView:(SKView *)view {

    //Overriden in each level scene
    [self initStaticLevelElements];

}

-(void) initStaticLevelElements {
}

@end

GameScene1.m 是：

//  GameScene1.m
#import "GameScene1.h"
#import "Customer.h"
#import "Competitor.h"

@implementation SKScene (Unarchive)

+ (instancetype)unarchiveFromFile:(NSString *)file {
    NSString *nodePath = [[NSBundle mainBundle] pathForResource:file ofType:@"sks"];

    NSData *data = [NSData dataWithContentsOfFile:nodePath
                                      options:NSDataReadingMappedIfSafe
                                        error:nil];
    NSKeyedUnarchiver *arch = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
    [arch setClass:self forClassName:@"SKScene"];
    SKScene *scene = [arch decodeObjectForKey:NSKeyedArchiveRootObjectKey];
    [arch finishDecoding];

    return scene;
}

@end

@implementation GameScene1

#include "GoodsConstants.h"

-(void) initStaticLevelElements {
    self.staticLevelElements = [[NSMutableArray alloc] init];

    self.name = @"name for scene one";

    SKNode * statics = [self childNodeWithName:@"statics"];

    statics.zPosition = 100;
    SKSpriteNode * e = (SKSpriteNode *)[statics childNodeWithName:@"house1"];
    NSLog(@"house one is: %@", e);

}

GameScene1.h 是：

//  GameScene1.h

#import <SpriteKit/SpriteKit.h>
#import "GameScene.h"


@interface GameScene1 : GameScene

@end

SKSpriteNode+StaticLevelElement.h 是：

//  SKSpriteNode+StaticLevelElement.h  

#import <SpriteKit/SpriteKit.h>
#import <SpriteKit/SKSpriteNode.h>

@interface SKSpriteNode (StaticLevelElement)

-(void) initWithSKNode:(SKNode *)node;

@property NSNumber * pseudoDepth;

@end

SKSpriteNode+StaticLevelElement.m 是：

//SKSpriteNode+StaticLevelElement.m

#import <objc/runtime.h>
#import "SKSpriteNode+StaticLevelElement.h"

NSString * const pseudoDepthSelector = @"pseudoDepth";

@implementation SKSpriteNode (StaticLevelElement)

@dynamic pseudoDepth;

- (instancetype)initWithCoder:(NSCoder *)coder
{
    self = [super initWithCoder:coder];
    self.userInteractionEnabled = YES;

    return self;
}

- (void)setPseudoDepth:(NSNumber *)pseudoDepth
{
objc_setAssociatedObject(self, (__bridge const void *)(pseudoDepthSelector), pseudoDepth, OBJC_ASSOCIATION_RETAIN_NONATOMIC);
}

- (NSNumber *)pseudoDepth
{
    return objc_getAssociatedObject(self, (__bridge const void *)(pseudoDepthSelector));
}

-(void) touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

}

-(void) touchesMoved:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {

}

@end

为了设置每个场景（级别）的具体数据，我使用了基本 GameScene 的继承 class - 因此我得到了 GameScene1、GameScene2 等。有谁知道我错过了什么才能看到纹理？

Answer 1

我从中删除了 initWithCoder 覆盖方法 SKSpriteNode+StaticLevelElement.m 现在一切正常，纹理和精灵都显示在屏幕上。

将 SKSpriteNode 与类别一起使用时，未找到精灵的纹理且未显示精灵

Texture for sprite not found and sprite not displayed when using SKSpriteNode with a category

ios

skspritenode

skscene