I am using the interface editor to add tap gestures. I have a grid of 9 imageViews which are currently occupied by placeholders but upon touching, an imagePicker will trigger and the placeholders will replaced by actual images. I have a very infuriating bug that I've been mulling over for a few hours and can't figure out. My bottom 6 imageviews- the tap gestures seem to work. But for some reason, the top 3 imageviews don't respond to the taps. The weird thing is that if I tap outside of the circular placeholder and in the larger imageview that the placeholder is contained, it works. Any thoughts? I've made sure every grid is userinteractionenabled as well, and even tried deleting the buggy imageviews and creating new ones.
You can check the issue with layers in runtime. You can find out which layers are in above of UIImageView.
When you run the app and then select The Debug View Hierarchy tab at bottom of Xcode screen above of consol tab.
Related
Let me emphasize that there are two views that overlap and I want handle the touch gestures of the view on top.
The UIGestureRecognizeDelegate methods work for conflicting gestures within one view not two views from what I have read. Please don't link me to those threads without explaining.
This issue is occurring between the toolbar items and an image view with gestures attached to it.
In the image above the bar buttons cannot be touched.
Other apps handle this case without issues. If I touch a bar button it would work and if I drag the view on the non-overlapped parts I would be able to drag it.
How can I achieve this ?
Currently the image view has gestures attached to it (one for testing, its a pan).
Update
As requested here is a Gif.
Notice how the buttons are not responding when there is a view under the toolbar.
The issue was that I was using view.layer.zPosition, apparently changing the zPosition does not change the position of view is the subview hierarchy (which was something that I assumed).
Source: https://stackoverflow.com/a/15807250/3366784
I'm developing an Enterprise app for tracking mileage and maintenance for company vehicles. I've added graphic buttons to snazz it up a bit. The buttons look the way they're supposed to look on the XIB in IB, and on the iPhone all other UIViews look correct, but on one particular UIView the graphic images are stretched way out of proportion vertically.
The first image below shows how it's supposed to look, with the three graphics buttons at the bottom. The second image shows how it's showing on the phone. The Help button on this screen cap shows normally, but it can't be counted on to stay that way.
It also is not consistent. Calling this view at any time may show the image stretched or it may not show an image at all. It rarely shows the image normally, like the Help button looks below.
The development phone is a 4S running 6.1.3. The views are set for the Retina 3.5 screen. XCode is the latest (whatever it is).
Again, it's only on this one view that the problem shows up. There is another UIView on the same view controller that is hidden when this UIView is shown. The button graphics on the other view look fine. All of the other views and view controllers use the same graphics on the UIButton, without any problem.
In Interface Builder (Xcode) you created the view using a 4.5-inch screen height.
But the device where you are seeing the problem is a 5-inch screen. So the view is resized to fit.
And when it does that, the autolayout constraints that Interface Builder put on those subviews take over to determine what they do. Those constraints are causing the heights to change.
No need to turn Autolayout off. Autolayout can be very useful, but it seems to enjoy randomly assigning the constraint "Align Baseline to:" to UIButtons after repositioning them.
Just select the UIButton/UIImageView in question inside Storyboard, locate the constraint "Align Baseline to:", tap the gear icon and select "Promote to User Constraint", and tap once more and select "Delete". This should solve your issue.
In response to the comments here, I will answer my own question: I turned Autolayout off for this view controller, and that fixed everything. This is the first app I have written since XCode has begun development for the iPhone 5, so I wasn't aware of the Autolayout feature. I'll need to understand how it works and why it did what it did.
Thanks for all your help!
Kinda confusing title but oh well.
I have a UIScrollView in my viewController, in that is 3 UIViews with some buttons in each. I download data from a server and populate it into the view and this works as soon as you start scrolling the UIScrollView, but sometimes the buttons only partially load.
Usually its the button label without my formatting added to it. The button works and as soon as you click the button the rest of view loads correctly. Basically if the UIScrollView is touched in anyway it displays correctly.
I've tried adding and removing the scrollView to the view and I've called [scrollView setNeedsDisplay] and the exact same thing happens.
Anyone come across this?
EDIT: screen shot before and after (just basic to demonstrate whats happening)
I was building the buttons in drawRect which was causing issues. Built the buttons in a separate method and it worked fine.
I am new in iphone.I added 10 buttons on the scrollview.Buttons are scroll properly,but only 5 buttons are working last five buttons are not working.please suggest me what i do next.
It sounds like it could be one of two things
Either ...
There are no associated actions with the buttons (programatically or in IB)
There is another view that is covering the buttons and taking all the touch events
Try swapping the position of two of the buttons (one working and one not) and see if they continue to work as before. If they do, then it looks like the actions are not set up. If they have now changed, then there is an issue with where the buttons are placed.
I also have faced such problems...I also think there will be another view which is covering that button and their touch events....
I'm building an iPhone application and like most I am trying to implement a UIScrollView with a UIPageControl, however I am coming across a very quirky behavior, which I assume may be a bug. Hopefully one of you has seen this before because it is driving me nuts.
Basically, the page control works fine, everything is hooked up and works normally on all accounts EXCEPT, with certain placements of the UIPageControl within the UIView, the UIPageControl will cease to render.
I'll just take screenshots of the XIB window to help illustrate... here's a placement that works perfectly fine:
http://www.jasconi.us/prob1.png
The UIPageControl is placed physically above the UIScrollView. Works great, everything is visible and working.
The next two DO NOT work:
http://www.jasconi.us/prob2.png
http://www.jasconi.us/prob3.png
The first one is simply placed below the scroll view. Doesn't render at all.
The second one is placed above the scroll view without technically being inside of it. Also doesn't render.
What the hell is up with this? I've tried using
[[self view] bringSubviewToFront:pageControl];
...to no avail.
Any ideas?
OK I found the answer to this, it's a little six degrees of Kevin Bacon.
This isn't actually a software bug, but a XIB quirk, for some reason the lower placement of the page control in combination with the default settings for autosize and anchor seem to jettison the control into outer space.
If you turn off all auto-scaling and auto-sizing and auto-anchoring and all that other crap, the controls appear exactly as you expected. The fact that it appears reliably when placed above the ScrollView is an oddity.
shrug.
Hope this helps future iPhone initiates.
Did you check to make sure that numberOfPages is not 0?
If you set a breakpoint can you see that pageControl is not nil?
I was still encountering this exact same problem, even after trying everyone's posted answers. My issue ended up being a little more "DOH":
I was using UIPageControl at the bottom of a modal FormSheet, however, I forgot to set the size of the view as Form Sheet in the xib. This caused my page control to be off the screen and never visible.
Moral: set view size (Full, Form, Page, etc) in your xib on the base view.
This will sound like a real no brainer, but I got caught out by it.
By default, UIPageControl expects to be on a dark background. IE: The dots are light gray, and white for the current page.
I used UIPageControl on it's own with no scrollview to change the time range of a graph I was rendering with drawRect:
Long story short, the graph background was white, so the page controller worked, I just couldn't see it. The solution was putting the graph itself in a subview, and making the parent that contained the page control have a dark background.