帶有隨機文本/值或標籤的UIButton

Question

我在歷史記錄板中創建了10個UIButton，好嗎？
我想添加不重複這些數字的隨機數字，即每當查看被加載時散佈的從0到9的數字。

我試圖在Google上找到一種方法來使用我現有的按鈕（10個UIButton），並將它們應用於隨機值。找到大多數方法（arc4random() % 10），重複這些數字。

• Here's one
• here's another
• here's another

所有的結果發現，創建按鈕的動態。任何人都通過這個？

Answer 1

創建一個數組的數組。然後執行一組隨機交換數組中的元素。你現在有隨機順序的唯一號碼。

- (NSArray *)generateRandomNumbers:(NSUInteger)count { 
    NSMutableArray *res = [NSMutableArray arrayWithCapacity:count]; 
    // Populate with the numbers 1 .. count (never use a tag of 0) 
    for (NSUInteger i = 1; i <= count; i++) { 
     [res addObject:@(i)]; 
    } 

    // Shuffle the values - the greater the number of shuffles, the more randomized 
    for (NSUInteger i = 0; i < count * 20; i++) { 
     NSUInteger x = arc4random_uniform(count); 
     NSUInteger y = arc4random_uniform(count); 
     [res exchangeObjectAtIndex:x withObjectAtIndex:y]; 
    } 

    return res; 
} 

// Apply the tags to the buttons. This assumes you have 10 separate ivars for the 10 buttons 
NSArray *randomNumbers = [self generateRandomNumbers:10]; 
button1.tag = [randomNumbers[0] integerValue]; 
button2.tag = [randomNumbers[1] integerValue]; 
... 
button10.tag = [randomNumbers[9] integerValue]; 

Answer 2

@meth有正確的想法。如果你想確保數字不重複，請嘗試如下所示：（注意：頂部會生成最高數字，確保這=數量，否則這將永遠循環並永遠;）

- (NSArray*) makeNumbers: (NSInteger) amount withTopBound: (int) top 
{ 
    NSMutableArray* temp = [[NSMutableArray alloc] initWithCapacity: amount]; 

    for (int i = 0; i < amount; i++) 
    { 
     // make random number 
     NSNumber* randomNum; 

     // flag to check duplicates 
     BOOL duplicate; 

     // check if randomNum is already in your array 
     do 
     { 
      duplicate = NO; 
      randomNum = [NSNumber numberWithInt: arc4random() % top]; 

      for (NSNumber* currentNum in temp) 
      { 
       if ([randomNum isEqualToNumber: currentNum]) 
       { 
        // now we'll try to make a new number on the next pass 
        duplicate = YES; 
       } 
      } 
     } while (duplicate) 

     [temp addObject: randomNum]; 
    } 

    return temp; 
}