Question

我正在制作一个触摸绘制应用程序，一切都工作正常，但是当我旋转我的iPad时，我触摸的线条在我手指上方5厘米处。

iv一直在谷歌搜索，试图找出x＆amp; y旋转时会发生变化。

你能帮助我吗？

我的代码用于绘制它：

- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {

mouseSwiped = YES;

UITouch *touch = [touches anyObject];   
CGPoint currentPoint = [touch locationInView:self.view];
currentPoint.y -= -20;


UIGraphicsBeginImageContext(self.view.frame.size);

[drawImage.image drawInRect:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
CGContextSaveGState(UIGraphicsGetCurrentContext());
CGContextSetShouldAntialias(UIGraphicsGetCurrentContext(), YES);
CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound);
CGContextSetBlendMode(UIGraphicsGetCurrentContext(), kCGBlendModeCopy);
CGContextSetLineWidth(UIGraphicsGetCurrentContext(), f5);
CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), f1, f2, f3, f4);
CGContextBeginPath(UIGraphicsGetCurrentContext());
CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y);
CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y);
CGContextStrokePath(UIGraphicsGetCurrentContext());
drawImage.image = UIGraphicsGetImageFromCurrentImageContext();
CGContextRestoreGState(UIGraphicsGetCurrentContext());
UIGraphicsEndImageContext();

lastPoint = currentPoint;


mouseMoved++;

if (mouseMoved == 10) {
    mouseMoved = 0;}}

Answer 1

我在我的appDelegate中使用了边界并在我的绘图代码中使用了框架... 我改为：

 UIGraphicsBeginImageContext(self.view.bounds.size);

[drawImage.image drawInRect:CGRectMake(0, 0, self.view.bounds.size.width,self.view.bounds.size.height)];

旋转时触摸画

1 个答案: