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我有這樣的代碼對我touchesMoved但其他人喜歡它不工作的UIScrollView目標C:畫(寫)上觸摸一個UIScrollView
這,我touchesMoved:
touchSwiped = YES;
currentTouch = [touch locationInView:self.view];
currentTouch.y -= 5;
UIGraphicsBeginImageContext(self.view.frame.size);
[writeView.image drawInRect:CGRectMake(0, 0, 768, 1024)];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineCap(context, kCGLineCapRound);
CGContextSetLineWidth(context, 15);
CGContextSetRGBStrokeColor(context, 0, 0, 0, 1);
CGContextSetBlendMode(context, kCGBlendModeNormal);
CGContextMoveToPoint(context, endPoint.x, endPoint.y);
CGContextAddLineToPoint(context, currentTouch.x, currentTouch.y);
CGContextStrokePath(context);
writeView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
endPoint = currentTouch;
touchMoved++;
if (touchMoved == 10) {
touchMoved = 0;
}
所以,我使用手勢識別器轉移它,但仍然無法正常工作。
我使用的PanGestureRecognizer
這裏:
- (void) writePan:(UIPanGestureRecognizer *)writingRecognizerP {
switch (writingRecognizerP.state)
{
case UIGestureRecognizerStateChanged:
[scrollView setScrollEnabled:NO];
[scrollView setUserInteractionEnabled:NO];
touchSwiped = YES;
currentTouch = [writingRecognizerP locationInView:scrollView];
currentTouch.y -= 5;
UIGraphicsBeginImageContext(self.view.frame.size);
[writeView.image drawInRect:CGRectMake(0, 0, 768, 1024)];
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetLineCap(context, kCGLineCapRound);
CGContextSetLineWidth(context, 15);
CGContextSetRGBStrokeColor(context, 0, 0, 0, 1);
CGContextSetBlendMode(context, kCGBlendModeNormal);
CGContextMoveToPoint(context, endPoint.x, endPoint.y);
CGContextAddLineToPoint(context, currentTouch.x, currentTouch.y);
CGContextStrokePath(context);
writeView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
endPoint = currentTouch;
touchMoved++;
if (touchMoved == 10) {
touchMoved = 0;
}
break;
case UIGestureRecognizerStateEnded:
[scrollView setScrollEnabled:YES];
[scrollView setUserInteractionEnabled:YES];
break;
}
}
人誰擁有一個想法,我將如何能夠在觸摸寫?
它將不勝感激! :)
什麼是writeView?它在視圖層次結構中與自我的關係是什麼? – iccir
這是一個清晰的UIImageView,它是繪圖出現的地方。 – Crisn
如果你的NSLog(@「%@」,writeView),它在視圖層次結構中是否正確並且大小正確? – iccir