Question

我试图随机添加多个图像到我的场景。我有4个名为Gem1，Gem2，Gem3和Gem4的图像。我被卡住了。这是我到目前为止的代码，但有错误。有人能帮帮我吗？

- (void)addGem {

// Create sprite
NSString *base = @"Gem";
uint32_t num = arc4random_uniform(4) + 1; //Generate a random number
NSString *GemName = [base stringByAppendingFormat:@"%d.png", num];
SKSpriteNode * Gem = [SKSpriteNode spriteNodeWithImageNamed:@"GemName"];

_gem = Gem;

Gem.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:Gem.size]; // 1
Gem.physicsBody.dynamic = YES; // 2
Gem.physicsBody.categoryBitMask = GemCategory; // 3
Gem.physicsBody.contactTestBitMask = monsterCategory; // 4
Gem.physicsBody.collisionBitMask = 0;

int minx = 200;
int maxx = 1000;
int rangex = maxx - minx;
int actualx = (arc4random() % rangex) + minx;
int minY = 900;
int maxY = 1200;
int rangeY = maxY - minY;
int actualY = (arc4random() % rangeY) + minY;

Gem.position = CGPointMake(actualx, actualY);

[_background addChild:Gem];
[self runAction:[SKAction sequence:@[
[SKAction waitForDuration:5],
[SKAction performSelector:@selector(addGem) onTarget:self],]]];


}

Answer 1

只需删除“”即可。：d

来自

SKSpriteNode * Gem = [SKSpriteNode spriteNodeWithImageNamed:@"GemName"];

要

SKSpriteNode * Gem = [SKSpriteNode spriteNodeWithImageNamed:GemName];

您需要发布“addGem”方法来帮助您解决职位问题;如果你有任何。

Answer 2

SKSpriteNode * Gem = [SKSpriteNode spriteNodeWithImageNamed:@"GemName"];

此处GemName是一个变量，它不应该被""包裹，只需删除它。

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2 个答案: