#pragma mark - 随机数
 
- (NSInteger)getRandomNumber:(CGFloat)from to:(CGFloat)to
{
  return (NSInteger)(from + (arc4random() % ((NSInteger)to - (NSInteger)from + 1)));
}
 
 
#pragma mark - 随机按钮
 
- (void)createRandomBtnWithType:(FruitType)fruitType andText:(NSString *)textString
{
  CGFloat minY = kBtnMinY + kBtnDiameter * 0.5 + kMargin;
  CGFloat maxY = self.bounds.size.height - kBtnDiameter * 0.5 - kMargin;
  CGFloat minX = kBtnMinX + kMargin;
  CGFloat maxX = DEF_SCREEN_WIDTH - kBtnDiameter * 0.5 - 0 - kMargin;
  
  CGFloat x = [self getRandomNumber:minX to:maxX];
  CGFloat y = [self getRandomNumber:minY to:maxY];
  
  BOOL success = YES;
  for (int i = 0; i < self.centerPointArr.count; i ++) {
    NSValue *pointValue = self.centerPointArr[i];
    CGPoint point = [pointValue CGPointValue];
    //如果是圆 /^2 如果不是圆 不用/^2
    if (sqrt(pow(point.x - x, 2) + pow(point.y - y, 2)) <= kBtnDiameter + kMargin) {
      success = NO;
      [self createRandomBtnWithType:fruitType andText:textString];
      return;
    }
  }
  if (success == YES) {
    NSValue *pointValue = [NSValue valueWithCGPoint:CGPointMake(x, y)];
    [self.centerPointArr addObject:pointValue];
    
    UIButton *randomBtn = [UIButton buttonWithType:0];
    randomBtn.bounds = CGRectMake(0, 0, kBtnDiameter, kBtnDiameter);
    randomBtn.center = CGPointMake(x, y);
    [randomBtn setTitleColor:[UIColor whiteColor] forState:0];
    [self addSubview:randomBtn];
    [randomBtn addTarget:self action:@selector(randomBtnClick:) forControlEvents:UIControlEventTouchUpInside];
    
    [self.randomBtnArr addObject:randomBtn];
    [self.randomBtnArrX addObject:randomBtn];
    
    //区分
    if (fruitType == FruitTypeTimeLimited) {
      randomBtn.tag = kUnlimitedBtnTag + self.centerPointArr.count - 1;
      [self.timeLimitedBtnArr addObject:randomBtn];
      randomBtn.backgroundColor = [UIColor blueColor];
    } else if (fruitType == FruitTypeUnlimited) {
      randomBtn.tag = kTimeLimitedBtnTag + self.centerPointArr.count - 1;
      [self.unlimitedBtnArr addObject:randomBtn];
      randomBtn.backgroundColor = [UIColor redColor];
    }
    [randomBtn setTitle:textString forState:0];
    
    [self animationScaleOnceWithView:randomBtn];
    [self animationUpDownWithView:randomBtn];
  }
}

好了 搞定了不相交的随机按钮，还需要搞一下动画 这里肯定是要用核心动画没跑了

#pragma mark - 动画
 
- (void)animationScaleOnceWithView:(UIView *)view
{
  [UIView animateWithDuration:0.2 animations:^{
    view.transform = CGAffineTransformMakeScale(1.05, 1.05);
  } completion:^(BOOL finished) {
    [UIView animateWithDuration:0.2 animations:^{
      view.transform = CGAffineTransformMakeScale(1.0, 1.0);
    } completion:^(BOOL finished) {
    }];
  }];
}
 
- (void)animationUpDownWithView:(UIView *)view
{
  CALayer *viewLayer = view.layer;
  CGPoint position = viewLayer.position;
  CGPoint fromPoint = CGPointMake(position.x, position.y);
  CGPoint toPoint = CGPointZero;
  
  uint32_t typeInt = arc4random() % 100;
  CGFloat distanceFloat = 0.0;
  while (distanceFloat == 0) {
    distanceFloat = (6 + (int)(arc4random() % (9 - 7 + 1))) * 100.0 / 101.0;
  }
  if (typeInt % 2 == 0) {
    toPoint = CGPointMake(position.x, position.y - distanceFloat);
  } else {
    toPoint = CGPointMake(position.x, position.y + distanceFloat);
  }
  
  CABasicAnimation *animation = [CABasicAnimation animationWithKeyPath:@"position"];
  animation.removedOnCompletion = NO;
  animation.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
  animation.fromValue = [NSValue valueWithCGPoint:fromPoint];
  animation.toValue = [NSValue valueWithCGPoint:toPoint];
  animation.autoreverses = YES;
  CGFloat durationFloat = 0.0;
  while (durationFloat == 0.0) {
    durationFloat = 0.9 + (int)(arc4random() % (100 - 70 + 1)) / 31.0;
  }
  [animation setDuration:durationFloat];
  [animation setRepeatCount:MAXFLOAT];
 
  [viewLayer addAnimation:animation forKey:nil];
}

我是这样做的

1.在btn出现的时候 先放大一下再回到原大小以展示一个闪烁的效果
2.让每一个按钮加一个上下移动的动画 设置持续时间为某个值 并设置重复次数为MAXFLOAT

但是如果只是这样做 又会出现一个很蛋疼的问题:所有的随机按钮都以相同的频率 向同一个方向 移动相同的距离

这时候 我想到了一个办法(我猜应该还有更好的办法，求大佬指教)
有三个参数 可能会影响抖动

1.抖动频率
2.抖动距离
3.抖动方向

好了 那每次给button加核心动画的时候都在一定范围内给这三个值设定随机数就好了
就是上面的 typeInt distanceFloat durationFloat 三个参数

以上。

gitee地址：iOS仿支付宝蚂蚁森林随机按钮及抖动

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。