字符串數組對象 - 精靈套件

Question

我有一個名爲sksprite節點的數組。我需要創建一個新數組，並把最後一個數組的名稱，但最接近（另一個節點的名稱 - 傾斜 - ）的精靈節點將首先在數組中，等等。 如果我沒有解釋清楚我的自我足夠清楚告訴我。如果有人知道如何去做，請告訴我。寫在這裏。 謝謝

Answer 1

正如我前面所說，你的問題缺乏一些具體的確切如何實施。我已經使我的代碼具有一定的通用性，可以適應幾乎所有您可能想到的場景。

我用觸摸位置座標作爲起點來計算到屏幕上4個節點的距離。點擊屏幕上的任意位置，列表將按距離順序打印4個節點名稱。

可能有更好的排序方法，但我決定採用快速和骯髒的方式。

#import "GameScene.h" 
@implementation GameScene { 
    SKSpriteNode *node0; 
    SKSpriteNode *node1; 
    SKSpriteNode *node2; 
    SKSpriteNode *node3; 
    NSMutableArray *nodeArray; 
} 

-(void)didMoveToView:(SKView *)view { 
    self.backgroundColor = [SKColor blackColor]; 
    nodeArray = [[NSMutableArray alloc] init]; 

    node0 = [SKSpriteNode spriteNodeWithColor:[SKColor redColor] size:CGSizeMake(10, 10)]; 
    node0.name = @"red"; 
    node0.position = CGPointMake(300, 300); 
    [self addChild:node0]; 
    [nodeArray addObject:node0]; 

    node1 = [SKSpriteNode spriteNodeWithColor:[SKColor blueColor] size:CGSizeMake(10, 10)]; 
    node1.name = @"blue"; 
    node1.position = CGPointMake(450, 500); 
    [self addChild:node1]; 
    [nodeArray addObject:node1]; 

    node2 = [SKSpriteNode spriteNodeWithColor:[SKColor yellowColor] size:CGSizeMake(10, 10)]; 
    node2.name = @"yellow"; 
    node2.position = CGPointMake(100, 400); 
    [self addChild:node2]; 
    [nodeArray addObject:node2]; 

    node3 = [SKSpriteNode spriteNodeWithColor:[SKColor greenColor] size:CGSizeMake(10, 10)]; 
    node3.name = @"green"; 
    node3.position = CGPointMake(200, 200); 
    [self addChild:node3]; 
    [nodeArray addObject:node3]; 
} 

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

    for (UITouch *touch in touches) { 
     CGPoint touchLocation = [touch locationInNode:self]; 

     NSMutableArray *myArray = [[NSMutableArray alloc] init]; 
     NSMutableDictionary *myDict = [[NSMutableDictionary alloc] init]; 

     for(SKSpriteNode *object in nodeArray) { 
      float xDistance = fabsf(touchLocation.x - object.position.x); 
      float yDistance = fabsf(touchLocation.y - object.position.y); 
      NSString *totalDistance = [NSString stringWithFormat:@"%f",(xDistance+yDistance)]; 

      [myDict setValue:totalDistance forKey:object.name]; 
     } 

     float lowestValue = 999999.0; 
     NSMutableString *lowestName = [[NSMutableString alloc] init]; 

     for (int i=0; i<[nodeArray count]; i++) { 

      for (NSString *key in myDict) { 

       if([[myDict objectForKey:key] floatValue] < lowestValue) { 
        lowestValue = [[myDict objectForKey:key] floatValue]; 
        [lowestName setString:key]; 
       } 
      } 

      [myArray addObject:[NSString stringWithString:lowestName]]; 
      [myDict removeObjectForKey:lowestName]; 
      lowestValue = 999999.0; 
     } 

     NSLog(@"values: %@",myArray); 
    } 
}