移動圖像到隨機佔位符

Question

我有一個簡單的拼圖遊戲我正在製作。我有一個方法，當視圖被加載和設備被震動時被調用。該方法在屏幕上的4個特定位置放置4個圖像。以下是代碼：

-(void) makePieceHolders { 
//create 4 points where the jigsaw pieces (images) will be placed 
CGPoint holder1 = CGPointMake(80, 80); 
CGPoint holder2 = CGPointMake(200, 80); 
CGPoint holder3 = CGPointMake(80, 200); 
CGPoint holder4 = CGPointMake(200, 200); 

image1.center = holder1; //set the position of the image center to one of the newly created points 
image1.alpha = 0.3;   //set the image opacity back to 0.3 
image2.center = holder2; 
image2.alpha = 0.3; 
image3.center = holder3; 
image3.alpha = 0.3; 
image4.center = holder4; 
image4.alpha = 0.3; 
} 

我想將圖像隨機放置在四個佔位符中。我有更多的代碼寫在下面，我得到1和4之間的隨機數字，並將每個圖像的標籤設置爲這些隨機數字中的每一個。

int randomNumber; 
int placeHolders[4]; 
int i=0; 
bool numberFound; 

do{ // until you get 4 unique numbers 
    randomNumber=arc4random()%4+1; 
    // Does this number exist already? 
    numberFound=FALSE; 
    for (int j=0; j<i; j++) { 
     if (placeHolders[j]==randomNumber) 
      numberFound=TRUE; 
    } 
    if (numberFound==FALSE){ 
     placeHolders[i]=randomNumber; 
     i++; 
    } 
} while (i<4); 

image1.tag = placeHolders[0]; 
image2.tag = placeHolders[1]; 
image3.tag = placeHolders[2]; 
image4.tag = placeHolders[3]; 


NSLog(@"img1 tag: %i img2 tag: %i img3 tag: %i img4 tag: %i", image1.tag, image2.tag, image3.tag, image4.tag); 

現在怎麼辦參考這個標籤信息，以便將它移動到一個佔位符？

僞代碼我在想：

where image tag = 1, move that image to holder1 
where image tag = 2, move that image to holder2 
............ 

我不知道該怎麼寫，雖然。

如果有更好的方法，我會很感激的幫助。謝謝

Answer 1

你不需要你複雜的do..while /標記邏輯。 只需使用一個數組：

NSMutableArray* images = [NSMutableArray arrayWithObjects: image1,image2,image3,image4,nil]; 

// shuffle the array 
NSUInteger count = [images count]; 
for (NSUInteger i = 0; i < count; i++) { 
    // Select a random element between i and end of array to swap with. 
    int nElements = count - i; 
    int n = (arc4random() % nElements) + i; 
    [images exchangeObjectAtIndex:i withObjectAtIndex:n]; 
} 

之後，你隨意放置您的圖像在一個新的秩序。之後分配的位置：

UIImageView* imageView1 = (UIImageView*)[images objectAtIndex: 0]; 
imageView.center = holder1; 
UIImageView* imageView2 = (UIImageView*)[images objectAtIndex: 1]; 
imageView.center = holder2; 
UIImageView* imageView3 = (UIImageView*)[images objectAtIndex: 2]; 
imageView.center = holder3; 
UIImageView* imageView4 = (UIImageView*)[images objectAtIndex: 3]; 
imageView.center = holder4; 

（你也可以這樣做在一個循環..所以這將是更普遍的和可重複使用。）