iphone - 如何在 iOS 的 UIGestureRecognizer 中匹配图像形状？

Question

我想做这样的形状匹配应用程序。

请检查此链接的第二张图片。

也请检查此链接，我可以拖放图像，但我无法匹配确切的位置，也无法用另一个图像填充该图像。

任何想法或建议都将受到高度欢迎。

Answer 1

//UIImageView *imageView1 (blank image with whom the image has to be matched),

//UIImageView *imageView2 (the coloured image that has to be matched)

Take a NSMutableArray positionArray, now whenever you add any new blank imageview (imageview1 ) to the screen add its additional information to the MutableArray like

UIImageView *imageview = [[UIImageView alloc] initWithFrame:CGRectMake(10,10,100,50)];
[imageview setTag:TagValue];
[imageview setImage:[UIImage imageNamed:@"blankMonkeyShapedImage.png"]];

//Incrementing the TagValue by one each time any blank imageview is added
TagValue++; 

NSMutableDictionary *locationDic=[[NSMutableDictionary alloc] init];
[locationDic setValue:[NSNumber numberWithInt:imageview.tag] forKey:@"TagNumber"]; 
[locationDic setValue:[NSString stringWithFormat:@"Monkey~example"] forKey:@"ImageName"];
[locationDic setValue:[NSNumber numberWithFloat:imageview.frame.origin.x] forKey:@"PosX"];
[locationDic setValue:[NSNumber numberWithFloat:imageview.frame.origin.x] forKey:@"PosY"];
[locationDic setValue:[NSNumber numberWithFloat:imageview.frame.size.width] forKey:@"SizeWidth"];
[locationDic setValue:[NSNumber numberWithFloat:imageview.frame.size.height] forKey:@"SizeHeight"];

[self.view addSubview:imageview];

[positionArray addObject:locationDic];

Now whenever you add any new blank imageview you should repeat the same for it . Coming back to the UIGestureRecognizer selector method

-(void)panGestureRecognizer:(UIPanGestureRecognizer *)gesture
{
      CGPoint translation = [gesture translationInView:self.view];

      for (int i=0 ; i<[positionArray count]; i++)
      {
          NSMutableDictionary *lctionDic=[positionArray objectAtIndexPath:i];

          float posX=[[lctionDic valueFor:@"PosX"] floatValue];
          float posY=[[lctionDic valueFor:@"PosY"] floatValue];
          float SizeWidth = [[lctionDic valueFor:@"SizeWidth"] floatValue];
          float SizeHeight = [[lctionDic valueFor:@"SizeHeight"] floatValue];


          if (translation.x >= posX && translation.x <= posX+SizeWidth &&
              translation.y >= posY && translation.y <= posX+SizeHeight )
          {
              //Condition where the dragged objects position matches any previousluy placed balnk imageview.

              if(gesture.view.tag==[[lctionDic valueFor:@"TagNumber"] intValue]) 
              {
                   NSLog(@"Matched Image's Name is : %@",[lctionDic valueForKey:@"ImageName"]);
                   break;
              }
              else
                  continue;
          }
      } 
}

Take special care at the time of allocating TagValues to the blank imageview and the toBeDragged imageview (both should be saem for same type of image).

Answer 2

这有点棘手。

您是编码员，您知道哪个图像与什么形状匹配，可能是您拍摄两个图像视图，一个带有形状，另一个带有图像..

PS：我只是给出一个想法。

因此，您可能可以跟踪标签。添加手势识别器以拖动图像，因此您将知道正在拖动哪个形状。现在在移动时只需将形状中心与图像当前位置的中心进行比较。确保您比较范围而不是精确的中心。

希望这么多信息对你有帮助:)