将UIImageView从ScrollView中拖出

Question

我有一个带UIScrollViewController的RootViewController(boardScrollView)。这个boardScrollView有一个UIImageView作为子视图(boardImage)来创建板。我可以放大、缩小和滚动boardScrollView中的板图像。效果很好！

现在我想拖动&将其他UIImageViews放入boardScrollView内的boardScrllImage中，也从boardScrollView中取出。对于这些其他UIImageViews(Tiles)，我创建了UIImageView类(TileViewClass)的子类。

我有阻力&drop working将Tile放入CCD_ 9；降落在CCD_ 10内部，但我无法获得阻力&下降到boardScrollView工作的外部。。我想这是因为我无法从子类访问rootviewcontroller中的视图。

也许在触摸Began中将Tile放回俯视图(窗口)更好，因此放置位置的确定总是从同一个视图中完成。但我不知道该怎么做。。。

我已经在touchesBegan方法中尝试过[[UIApplication sharedApplication].keyWindow bringSubviewToFront:self.dragObject];，但这并不能奏效。。。。也许我在某个地方错过了SuperView的remove？

任何人都知道我如何才能得到拖动&放弃工作？

RootViewController.h:

@interface RootViewController : UIViewController <UIScrollViewDelegate>

@property (nonatomic, strong) IBOutlet UIScrollView *boardScrollView;
@property (nonatomic, strong) UIImageView *dragObject;
@property (nonatomic, assign) CGPoint touchOffset;
@property (nonatomic, assign) CGPoint homePosition;
@property (nonatomic, strong) UIImageView *boardImage;

@end

RootViewController.m:

@implementation RootViewController
@synthesize boardScrollView;
@synthesize dragObject;
@synthesize touchOffset;
@synthesize homePosition;
@synthesize boardImage;
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
UIImage *image = [UIImage imageNamed:@"greyblue_numbered_15x15_900x900.png"];
self.boardImage = [[UIImageView alloc] initWithImage:image];
self.boardImage.frame = (CGRect){.origin=CGPointMake(0.0f, 0.0f), .size=image.size};
[self.boardScrollView addSubview:self.boardImage];
self.boardImage.userInteractionEnabled = YES;
self.boardScrollView.contentSize = image.size;
self.boardScrollView.canCancelContentTouches = NO;
self.boardScrollView.userInteractionEnabled = YES;
self.boardScrollView.clipsToBounds = YES;
}

TileImageView.h:

#import <UIKit/UIKit.h>
@interface TileImageView : UIImageView
@property (nonatomic, strong) UIImageView *dragObject;
@property (nonatomic, assign) CGPoint touchOffset;

@end

TileImageView.m:

#import "TileImageView.h"

@implementation TileImageView
@synthesize dragObject;
@synthesize touchOffset;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.exclusiveTouch = YES;
self.userInteractionEnabled = YES;
}
return self;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
if ([touches count] == 1) {
// one finger
CGPoint touchPoint = [[touches anyObject] locationInView:self.superview];
for (UIImageView *iView in self.superview.subviews) {
if ([iView isMemberOfClass:[TileImageView class]]) {
if (touchPoint.x > iView.frame.origin.x &&
touchPoint.x < iView.frame.origin.x + iView.frame.size.width &&
touchPoint.y > iView.frame.origin.y &&
touchPoint.y < iView.frame.origin.y + iView.frame.size.height)
{
self.dragObject = iView;
self.touchOffset = CGPointMake(touchPoint.x - iView.frame.origin.x,
touchPoint.y - iView.frame.origin.y);
[self.superview bringSubviewToFront:self];
}
}
}
}
}
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
CGPoint touchPoint = [[touches anyObject] locationInView:self.superview];
CGRect newDragObjectFrame = CGRectMake(touchPoint.x - touchOffset.x,
touchPoint.y - touchOffset.y,
self.dragObject.frame.size.width,
self.dragObject.frame.size.height);
self.dragObject.frame = newDragObjectFrame;
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
for (UIView *iView in self.superview.subviews) {
if ([iView isMemberOfClass:[UIScrollView class]])
{
CGPoint touchPointScreen = [[touches anyObject] locationInView:[UIApplication sharedApplication].keyWindow];
if (touchPointScreen.x > iView.frame.origin.x &&
touchPointScreen.x < iView.frame.origin.x + iView.frame.size.width &&
touchPointScreen.y > iView.frame.origin.y &&
touchPointScreen.y < iView.frame.origin.y + iView.frame.size.height)
{
for (UIView *iView2 in iView.subviews) {
[iView2 addSubview:self.dragObject];
CGPoint touchPointImage = [[touches anyObject] locationInView:iView2];
self.dragObject.frame = CGRectMake(touchPointImage.x - touchOffset.x,
touchPointImage.y - touchOffset.y,
self.dragObject.frame.size.width,
self.dragObject.frame.size.height);
}
} 
self.dragObject = nil;
} 
}

Answer 1

基本上，您可以捕捉tileimageview上的所有触摸事件，并移动其原点CGPoint。如果触摸事件结束，您的自行车将通过tileviews超级视图的所有子视图。

如果其中任何一个是UIScrollview，则尝试定位接触点是否与其边框匹配。

所以基本上你只是检查一下你的用户视图的框架。因此，你的接触点不能在它之外。

解决方案：您必须检查要删除tileimageview的视图！你可以假设它是你的uiscrollview的兄弟(我假设的)。

另一种方式，我建议：创建一个View-dropgroundview，在其中捕捉触摸(=>实现触摸发送)在那里，你可以放下你的视图，并检查例如dropviews的子类。

Answer 2

解决方案：我已将触摸方法委托给RootViewController。在那里，我可以访问所有子视图，最重要的是：最高视图。

这里，我说：

[self.view bringSubviewToFront:self.tmpDragObject];

然后它就工作了！