動畫同時畫線

Question

我正在使用下面的函數在兩個座標之間繪製一條線現在我想要顯示像線那樣的旋轉動畫是逐點繪製的，所以我該怎麼做？

  x1 = [[xCoordinates objectAtIndex:i]intValue]; 
      y1 = [[yCoordinates objectAtIndex:i]intValue]; 

      x2 = [[xCoordinates objectAtIndex:i+1]intValue]; 
      y2 = [[yCoordinates objectAtIndex:i+1]intValue]; 
      UIImageView *drawImage = [[UIImageView alloc] init]; 
      drawImage.frame = self.view.frame; 
      [self.view addSubview:drawImage]; 

      UIGraphicsBeginImageContext(self.view.frame.size); 
      [drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)]; 
      CGContextRef context = UIGraphicsGetCurrentContext(); 
      CGContextSetLineCap(context, kCGLineCapRound); 
      CGContextSetLineWidth(context, 5.0); 
      CGContextSetRGBStrokeColor(context, 0.5, 1.0, 1.0, 1.0); 
      CGContextMoveToPoint(context, xBegin, yBegin); 
      CGContextAddLineToPoint(context, x1, y1); 
      CGContextStrokePath(context); 
      drawImage.image = UIGraphicsGetImageFromCurrentImageContext(); 
      UIGraphicsEndImageContext(); 
      [drawImage release]; 
      [UIView commitAnimations]; 

Answer 1

這裏是一個示例代碼，可能會幫助你實現你想要的東西http://nachbaur.com/blog/core-animation-part-4。