[英]Transferring touches to copy of UIImageView
我一直在嘗試將 UIImageViews 從 UITableView 拖放到另一個視圖中。
我的一切工作都達到了一定程度。 我繼承了 UIPanGestureRecognizer 並將這個自定義識別器附加到我加載到表視圖中的所有 UIImageViews。
然后我覆蓋識別器的 touchesMoved 方法,除其他外,將臨時視圖添加到應用程序鍵 window,然后將所選 UIImageView 的副本添加到此臨時視圖中,如下所示:
UIView *dragAndDropView = [[UIView alloc] initWithFrame: [[UIScreen mainScreen] applicationFrame]];
dragAndDropView.backgroundColor = [UIColor whiteColor];
[[UIApplication sharedApplication].keyWindow addSubview: dragAndDropView];
ElementImageView * sourceImageView = (ElementImageView*)self.view;
ElementImageView *newImageView = [[ElementImageView alloc] initWithImage:sourceImageView.image];
newImageView.userInteractionEnabled = YES;
newImageView.frame = [self.view convertRect:sourceImageView.frame toView:dragAndDropView];
[dragAndDropView addSubview:newImageView];
由於這段代碼,我確實在我的 dragAndDropView 頂部獲得了源圖像視圖的副本(我可以判斷,因為我將 dragAndDropView 的背景顏色設置為白色)。 如果我抬起手指再次觸摸復制的圖像視圖,我當然可以隨意在屏幕上拖動它。 但是我找不到將現有觸摸無縫轉移到新的 object 的方法。
有任何想法嗎?
我認為您可以在 UIPanGestureRecognizer 處理程序上執行以下操作:
-(void) handlePan:(UIPanGestureRecognizer *)recognizer {
if (recognizer.state == UIGestureRecognizerStateBegan) {
// the initial position
initialPanPositionX = self.transform.tx;
initialPanPositionY = self.transform.ty;
// create a copy of the imageview
panImage = [[UIImageView alloc] initWithImage:imageView.image];
panImage.frame = imageView.frame;
[self.view addSubview:panImage];
}
else if (recognizer.state == UIGestureRecognizerStateChanged) {
if (!startedMoving) {
startedMoving = YES;
[UIView beginAnimations:nil context:NULL]; {
[UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
[UIView setAnimationDuration:0.2f];
// an effect to increase a copy a little bit when start dragging
CGAffineTransform zt = CGAffineTransformScale(CGAffineTransformIdentity, 1.2, 1.2);
panImage.bounds = CGRectApplyAffineTransform(panImage.bounds, zt);
}
[UIView commitAnimations];
}
// translation
CGPoint point = [recognizer translationInView:self];
panImage.transform = CGAffineTransformMakeTranslation(initialPanPositionX + point.x, initialPanPositionY + point.y);
}
else if (recognizer.state == UIGestureRecognizerStateEnded ) {
startedMoving = NO;
// drop the imageView if it's inside the droppable view
[panImage release], panImage = nil;
}
}
希望能幫助到你。
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