Question

我有RootViewController UIScrollViewController（boardScrollView）。这个boardScrollView有一个UIImageView作为子视图（boardImage）来创建电路板。我可以放大和缩小并在boardScrollView内的boardImage上滚动。效果很棒！

现在我想拖动＆amp;将其他UIImageViews放入boardScrollView中的boardScrollImage以及boardScrollView的OUT中。对于这些其他UIImageViews（Tiles），我创建了UIImageView类（TileViewClass）的子类。

我有拖放工作将Tile INTO放到boardScrollView/boardImage并拖放到boardScrollView/boardImage内，但我无法拖放到{OUT}的boardScrollView工作.. 我认为这是因为我无法从子类中访问rootviewcontroller中的视图。

将图块放回touchesBegan中的顶视图（窗口）可能更好，因此始终从同一视图确定放置位置。但我不知道如何做到这一点......

我在touchesBegan方法中尝试了[[UIApplication sharedApplication].keyWindow bringSubviewToFront:self.dragObject];，但这并没有做到这一点...... 也许我错过了某处的removeFromSuperView？

任何人都知道如何让拖拉机工作？

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

基本上你会捕捉tileimageview上的所有触摸事件并移动它的原点CGPoint。如果触摸事件结束，您可以骑自行车浏览瓷砖视图的所有子视图。

如果其中任何一个是UIScrollview，您会尝试找到接触点是否与其帧匹配。

所以基本上你只是检查你的uiscrollview的框架。因此，您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）。

其他方式，我建议：创建一个视图 - dropgroundview，在其中捕获触摸（=＆gt;实现touchesend）在那里你可以放弃你的观点并检查例如子类dropviews。

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。

我在这里说：

[self.view bringSubviewToFront:self.tmpDragObject];

然后它有效！

将UIImageView拖出ScrollView

2 个答案: