#import <Foundation/Foundation.h>
#import <CoreGraphics/CoreGraphics.h>
NS_ASSUME_NONNULL_BEGIN
#pragma mark - Models
/// 游戏方向枚举
typedef NS_ENUM(
NSUInteger, SnakeDirection) {
SnakeDirectionUp,
SnakeDirectionDown,
SnakeDirectionLeft,
SnakeDirectionRight
};
/// 游戏点模型
@interface Point : NSObject
@property (nonatomic, assign)
NSInteger x;
@property (nonatomic, assign)
NSInteger y;
- (instancetype)initWithX:(
NSInteger)x y:(
NSInteger)y;
+ (instancetype)pointWithX:(
NSInteger)x y:(
NSInteger)y;
@end
@implementation Point
- (instancetype)initWithX:(
NSInteger)x y:(
NSInteger)y {
self = [super init];
if (self) {
_x = x;
_y = y;
}
return self;
}
+ (instancetype)pointWithX:(
NSInteger)x y:(
NSInteger)y {
return [[self alloc] initWithX:x y:y];
}
- (BOOL)isEqual:(id)object {
if (self == object) return YES;
if (![object isKindOfClass:[Point class]]) return NO;
Point *other = (Point *)object;
return self.x == other.x && self.y == other.y;
}
- (
NSUInteger)hash {
return self.x * 31 + self.y;
}
- (NSString *)description {
return [NSString stringWithFormat:@"(%ld, %ld)", (long)self.x, (long)self.y];
}
@end
/// 食物模型
@interface Food : NSObject
@property (nonatomic, strong) Point *position;
@end
@implementation Food
@end
/// 蛇模型
@interface Snake : NSObject
@property (nonatomic, strong) NSMutableArray<Point *> *body;
@property (nonatomic, assign) SnakeDirection direction;
@property (nonatomic, assign) BOOL hasEaten;
- (void)move;
- (void)changeDirection:(SnakeDirection)newDirection;
- (void)grow;
@end
@implementation Snake
- (instancetype)init {
self = [super init];
if (self) {
_body = [NSMutableArray array];
_direction = SnakeDirectionRight;
_hasEaten = NO;
// 初始化蛇身
[_body addObject:[Point pointWithX:5 y:5]];
[_body addObject:[Point pointWithX:4 y:5]];
[_body addObject:[Point pointWithX:3 y:5]];
}
return self;
}
- (void)move {
if (self.body.count == 0) return;
Point *head = self.body.firstObject;
NSInteger newX = head.x;
NSInteger newY = head.y;
switch (self.direction) {
case SnakeDirectionUp:
newY--;
break;
case SnakeDirectionDown:
newY++;
break;
case SnakeDirectionLeft:
newX--;
break;
case SnakeDirectionRight:
newX++;
break;
}
Point *newHead = [Point pointWithX:newX y:newY];
if (!self.hasEaten) {
[self.body removeLastObject];
} else {
self.hasEaten = NO;
}
[self.body insertObject:newHead atIndex:0];
}
- (void)changeDirection:(SnakeDirection)newDirection {
// 防止直接反向移动
if ((self.direction == SnakeDirectionUp && newDirection == SnakeDirectionDown) ||
(self.direction == SnakeDirectionDown && newDirection == SnakeDirectionUp) ||
(self.direction == SnakeDirectionLeft && newDirection == SnakeDirectionRight) ||
(self.direction == SnakeDirectionRight && newDirection == SnakeDirectionLeft)) {
return;
}
self.direction = newDirection;
}
- (void)grow {
self.hasEaten = YES;
}
- (BOOL)checkCollisionWithWall:(CGRect)wall {
Point *head = self.body.firstObject;
return head.x < CGRectGetMinX(wall) || head.x >= CGRectGetMaxX(wall) ||
head.y < CGRectGetMinY(wall) || head.y >= CGRectGetMaxY(wall);
}
- (BOOL)checkSelfCollision {
Point *head = self.body.firstObject;
for (
NSInteger i = 1; i < self.body.count; i++) {
Point *bodyPart = self.body[i];
if ([head isEqual:bodyPart]) {
return YES;
}
}
return NO;
}
@end
#pragma mark - ViewModel
/// 游戏状态枚举
typedef NS_ENUM(
NSUInteger, GameState) {
GameStateNotStarted,
GameStatePlaying,
GameStatePaused,
GameStateOver
};
/// 游戏视图模型
@interface GameViewModel : NSObject
@property (nonatomic, assign) GameState gameState;
@property (nonatomic, strong) Snake *snake;
@property (nonatomic, strong) Food *food;
@property (nonatomic, assign) CGRect gameArea;
@property (nonatomic, assign)
NSInteger score;
@property (nonatomic, assign)
NSInteger highScore;
@property (nonatomic, copy, nullable) void (^onGameStateChanged)(GameState);
@property (nonatomic, copy, nullable) void (^onScoreChanged)(
NSInteger);
@property (nonatomic, copy, nullable) void (^onSnakeMoved)(void);
@property (nonatomic, copy, nullable) void (^onFoodGenerated)(void);
- (void)startGame;
- (void)pauseGame;
- (void)resumeGame;
- (void)resetGame;
- (void)changeSnakeDirection:(SnakeDirection)direction;
- (void)updateGame;
@end
@implementation GameViewModel
- (instancetype)init {
self = [super init];
if (self) {
_gameState = GameStateNotStarted;
_gameArea = CGRectMake(0, 0, 20, 20);
_score = 0;
_highScore = 0;
[self setupGame];
}
return self;
}
- (void)setupGame {
self.snake = [[Snake alloc] init];
self.food = [[Food alloc] init];
[self generateFood];
}
- (void)startGame {
if (self.gameState == GameStateNotStarted || self.gameState == GameStateOver) {
[self resetGame];
}
self.gameState = GameStatePlaying;
if (self.onGameStateChanged) {
self.onGameStateChanged(self.gameState);
}
}
- (void)pauseGame {
if (self.gameState == GameStatePlaying) {
self.gameState = GameStatePaused;
if (self.onGameStateChanged) {
self.onGameStateChanged(self.gameState);
}
}
}
- (void)resumeGame {
if (self.gameState == GameStatePaused) {
self.gameState = GameStatePlaying;
if (self.onGameStateChanged) {
self.onGameStateChanged(self.gameState);
}
}
}
- (void)resetGame {
[self setupGame];
self.score = 0;
if (self.onScoreChanged) {
self.onScoreChanged(self.score);
}
}
- (void)changeSnakeDirection:(SnakeDirection)direction {
[self.snake changeDirection:direction];
}
- (void)updateGame {
if (self.gameState != GameStatePlaying) return;
[self.snake move];
// 检查是否吃到食物
Point *snakeHead = self.snake.body.firstObject;
if ([snakeHead isEqual:self.food.position]) {
[self.snake grow];
self.score += 10;
if (self.score > self.highScore) {
self.highScore = self.score;
}
if (self.onScoreChanged) {
self.onScoreChanged(self.score);
}
[self generateFood];
if (self.onFoodGenerated) {
self.onFoodGenerated();
}
}
//
本文详细解释了NSInteger与NSUInteger这两种数据类型的区别。NSInteger是有符号整型，可以表示正数和负数；而NSUInteger是无符号整型，仅能表示非负数，常用于索引如indexPathrow或section等场景。
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