使用UILongPressGestureRecognizer UIScrollview的子视图 [英] Using UILongPressGestureRecognizer For Subviews of UIScrollview

问题描述

在过去四个小时，我尝试过许多Stack Overlow解决方案，但没有一个帮助解决我的问题。

这里是

• 我有一个 UIScrollView


• 在此ScrollView中有一个自定义UILabel和8个自定义UIImageView


• 我想检测长按



• 这样的工作

  
  
  

  UILongPressGestureRecognizer * longPress = [[UILongPressGestureRecognizer alloc] initWithTarget：self action：@selector（longPressDidFire :)];

longPress.minimumPressDuration = 0.5;
[scroll addGestureRecognizer：longPress]; // scroll defined elsewhere其他地方

滚动，长按事件不会触发。

1. 如何检测长按子视图滚动视图？


2. 这是一个很杂乱的黑客，但是，因为我可以检测长按滚动视图，有没有任何方式，我可以检测
   位置的按，以便我可以看到哪个特定子视图是
   被按下。

（insert subview here）.userInteractionEnabled = YES ，我为滚动视图的所有子视图设置此属性，所以这不应该是一个问题。

我也尝试过使用touchesBegan和touchesEnded方法，如Stack Overflow中的建议。

此外，对于图像视图，一个新的UILongPressGestureRecognizer为每个自定义图像视图，使用一个for循环，因为我知道1视图每个手势识别器规则。

第一次iOS开发人员，

Graham

PS我真的很喜欢，如果我能找到一个解决方案1.而不是凌乱的2。

---

：

在视图控制器的Init中

  UILongPressGestureRecognizer * longPress = [[UILongPressGestureRecognizer alloc] initWithTarget：self action：@selector（longPressDidFire :)]; 
 longPress.minimumPressDuration = 0.5; 
 [self.titleLabel addGestureRecognizer：longPress]; // titleLabel属性在其他地方初始化
 [mainView addSubview：self.titleLabel]; 
  

在加载图片方法中

  for（NSData * dataImg in results）{
 //有些工作将数据转换为图像，转换为图像视图img 
 img.delegate = self; 
 img.userInteractionEnabled = YES; 
 UILongPressGestureRecognizer * aLongPress = [[UILongPressGestureRecognizer alloc] initWithTarget：self action：@selector（longPressDidFire :)]; 
 aLongPress.minimumPressDuration = 0.5; 
 [img addGestureRecognizer：aLongPress]; 
 [imgContainer addSubview：img]; 
} 
  

---

- > scroll（UIScrollView） / p>

- > - > mainView（UIView）

- > - > - > titleLabel >

- > - > - > imgContainer（UIView）

- > - > - > - > / p>

  [self.view addSubview：scroll]; 
 [scroll addSubview：mainView]; 
 [mainView addSubview：self.titleLabel]; 
 [mainView addSubview：imgContainer]; 
 [imgContainer addSubview：img]; //通过for循环完成8x 
  

$ b

感谢@RequestExpression的回答，我现在知道mainView被压，但不是它的子视图，所以我需要找到一种方法来显示mainView的上面的subviews。 ：）

另一个更新，titleLabel工作。 ImageViews仍然不工作。 ：（

解决方案

Woohoo it works！

问题是：

imgContainer是具有多个UIImageView作为子视图的具有空框架的UIView 。

我的印象是，当我向imgContainer添加一个子视图时，imgContainer会展开

。

这是不是真的

我必须将imgContainer的框架设置为与滚动视图相同的内容框架，然后一切都变得确定。

我希望这个答案可以帮助任何其他未来的iOS计时器，像我一样。

For the past four hours, I have tried many Stack Overlow solutions but none have helped solve my problem.

Here it is,

• I have a UIScrollView
• Within that ScrollView there is one custom UILabel and 8 custom UIImageViews
• I want to detect a long press

• Something like this works

  UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressDidFire:)];
longPress.minimumPressDuration = 0.5; [scroll addGestureRecognizer:longPress]; //scroll defined elsewhere

However, if I replace the scroll with any subviews of scroll, the long press event never fires.

1. How do I detect a long press of a subview of a scroll view?
2. This is quite a messy hack, however, since I can detect long presses of a scroll view, is there any way where I can detect the position of the press so that I can see which specific subview is being pressed.

Also, (insert subview here).userInteractionEnabled = YES, I set this property for all my subviews of the scroll view, so this should not be a problem.

I have also tried using touchesBegan and touchesEnded method as suggested elsewhere in Stack Overflow.

Also, for the image views, I do set a new UILongPressGestureRecognizer for every custom image view, using a for loop, as I am aware of the 1 view per gesture recognizer rule.

From A First Time iOS Developer,

Graham

P.S. I'd really prefer if I could find a solution for 1. rather than the messy 2.

---

More Code As Requested:

In the Init of the view Controller

 UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressDidFire:)];
longPress.minimumPressDuration = 0.5;
[self.titleLabel addGestureRecognizer:longPress]; //titleLabel property initialized elsewhere
[mainView addSubview:self.titleLabel];

In a "load images" method

for (NSData * dataImg in results) {
//Does some work turning data into an image, into an image view called img
        img.delegate = self;
        img.userInteractionEnabled = YES;
        UILongPressGestureRecognizer *aLongPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressDidFire:)];
        aLongPress.minimumPressDuration = 0.5;
        [img addGestureRecognizer:aLongPress];
        [imgContainer addSubview:img];
}

---

Even More Code + Notes

self.view (UIView)

->scroll (UIScrollView)

->->mainView (UIView)

->->->titleLabel (UILabel)

->->->imgContainer (UIView)

->->->->images (UIImageViews)

[self.view addSubview:scroll];
[scroll addSubview:mainView];
[mainView addSubview:self.titleLabel];
[mainView addSubview:imgContainer];
[imgContainer addSubview:img]; //done 8x via for loop

Thanks to @RegularExpression's answer, I now am aware that the mainView is getting pressed, but not its subviews, so I need to find a way to display the mainView's subviews above it. :)

Another update, titleLabel works. ImageViews still don't work though. :(

解决方案

Woohoo it works!

The problem was:

imgContainer was a UIView with an empty frame with several UIImageViews as subviews

I was under the impression that as I added a subview to imgContainer, imgContainer would expand.

This is not true.

I had to set imgContainer's frame to the same content frame as the scroll view and then everything became ok.

I hope this answer helps any other future iOS firs timers like me.

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