Question

我想要实现的是创建一种功能，当用户点击图像时，它会推送到navController中的下一个VC。

ViewDidLoad中的

：

UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(singleTapAction:)];
[singleTap setNumberOfTapsRequired:1];
[singleTap setNumberOfTouchesRequired:1];
[self.scroll addGestureRecognizer:singleTap];

在singleTapAction中

：

- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
UIView *view = singleTap.view;
if([view isKindOfClass:[UIImageView class]]){
    NSLog(@"tapped on image");
}
else{
    NSLog(@"Just tapped");
}
}

if-logic似乎不起作用。它始终在日志中提供“Just tapped”。即使我点击UIImageView，它也会检测到我点击了scrollview，这是ImageView的容器。

(lldb) po view;
$0 = 0x1f5ed6e0 <UIScrollView: 0x1f5ed6e0; frame = (0 0; 320 416); clipsToBounds = YES; autoresize = W+H; gestureRecognizers = <NSArray: 0x1f5edc20>; layer = <CALayer: 0x1f5ecb80>; contentOffset: {0, 0}>

编辑：

我使用imageview填充scrollview的方式是：

ALAssetsLibrary *assetsLibrary = [[ALAssetsLibrary alloc] init];
[assetsLibrary enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos
                             usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
                                 if (nil != group) {
                                     // be sure to filter the group so you only get photos
                                     [group setAssetsFilter:[ALAssetsFilter allPhotos]];
                                     NSLog(@"%d images found", group.numberOfAssets);
//                                         for(int i = group.numberOfAssets - 5; i<group.numberOfAssets - 1; i++){
                                     dispatch_apply(4, dispatch_get_global_queue(0, 0), ^(size_t i){
                                     [group enumerateAssetsAtIndexes:[NSIndexSet indexSetWithIndex:i]
                                                             options:0
                                                          usingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
                                                              if (nil != result) {
                                                                  ALAssetRepresentation *repr = [result defaultRepresentation];
                                                                  // this is the most recent saved photo
                                                                  UIImage *img = [self fixrotation:[UIImage imageWithCGImage:[repr fullResolutionImage]]];
                                                                  UIImageOrientation orient = img.imageOrientation;
                                                                  NSLog(@"orientation: %d", orient);
                                                                  CGFloat aspectRatio = img.size.width/img.size.height;
                                                                  UIImageView *imgView = [[UIImageView alloc] init];

                                                                  imgView.frame = CGRectMake(10, self.yCord, 300, 300 /aspectRatio);

                                                                  self.yCord += margin + (300/aspectRatio);

                                                                  imgView.image = img;
                                                                  imgView.layer.shadowRadius = 5.0;
                                                                  imgView.layer.shadowColor = [UIColor blackColor].CGColor;

                                                                  imgView.layer.cornerRadius = 4.0;
                                                                  [imgView setUserInteractionEnabled:YES];
                                                                  [self.scroll addSubview:imgView];

                                                                  NSLog(@"%@", imgView);
                                                                  NSLog(@"%f, %f, %f, %f", imgView.frame.origin.x, imgView.frame.origin.y, imgView.frame.size.width, imgView.frame.size.height);
                                                                  *stop = YES;
                                                                  self.scrollViewHeight = self.yCord + imgView.frame.size.height + margin;
                                                                  CGSize scrollViewSize = CGSizeMake(320, self.scrollViewHeight);
                                                                  [self.scroll setContentSize:scrollViewSize];
                                                                  //self.scroll.frame = CGRectMake(0,0, 320, self.scrollViewHeight);
                                                              }
                                                          }];
                                                    });
                                 }
                                 *stop = NO;
                             } failureBlock:^(NSError *error) {
                                 NSLog(@"error: %@", error);
                             }];

现在出现的另一个问题是，setUserInteraction是否在块内工作？

Answer 1

为什么不在ImageView上添加点击手势而不是

添加滚动...

并制作代码

[self.imageView setUserInteractionEnabled:YES];

Answer 2

您可以检测触摸是否在图像视图中，如此...

- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
    CGPoint touchPoint = [singleTap locationInView:self.scroll];

    if(CGRectContainsPoint(self.tappableImageView.frame, touchPoint){
        NSLog(@"tapped on image");
    }
    else{
        NSLog(@"Just tapped");
    }
}

如果你有多个图像视图，那么做这样的事情......

- (void)singleTapAction:(UIGestureRecognizer *)singleTap {
    CGPoint touchPoint = [singleTap locationInView:self.scroll];

    UIImageView *theTappedView;

    for (UIView *subView in [self.scroll subViews]) {
        if(CGRectContainsPoint(self.tappableImageView.frame, touchPoint)
               && [subView isKindOfClass:[UIImageView class]]) {
            theTappedView = subView;
            break;
        }
    }

    if(theTappedView != nil){
        NSLog(@"tapped on image");
    }
    else{
        NSLog(@"Just tapped");
    }
}

注意

这假设将被点击的所有图像视图都是self.scroll scrollView的子视图。

Answer 3

在您的代码中singleTap.view始终是点击手势附加的视图，而不是您认为点按的视图。

您应该为每个图像视图单独创建和附加点按手势，而不是在容器视图中添加一个。

Answer 4

为什么不使用UIButton？

您可以为按钮设置自定义图像。

这样，该按钮可以为您处理点击事件，而不是您编写自己的点击手势处理程序。

我注意到你的代码中有：

UIView * view = gesture.view;

您是否尝试将其更改为：

UIImageView * view = gesture.view;

顺便说一句，当您将图像添加到滚动视图时，您可能希望立即将该手势识别器添加到该图像，而不是将其添加到滚动视图中。

检测用户是否已点击UIImageView

4 个答案: