This seems to be a very simple UI design requirement that I can't seem to find a way to implement easily in iOS. Basically the UI guys want the dot of the current page indicator to be an elongated dot instead of the regular dot. For example the standard dots of the UIPageControl are 14x14 on a Retina screen, while they want the dot of the current page to be 30x14, and I googled around but can't seem to find an easy way to accomplish this?
I've seen previous answers on how to put some custom UIImageViews into the subviews of the UIPageControl, however they don't seem to be working for the latest iOS versions. Simply changing the width of the dot for the current page indicator just messes up the spacing between the dots. I guess I can create my own custom UIView from the ground up for this feature, but that seems to be a lot of work for such a simple requirement.
So any idea how to make the current page indicator dot of UIPageControl to look differently from the rest of the dots? Thanks.
I get it by rewriting UIPageControl.layoutSubviews.
my code: https://github.com/SumiaFish/KVPageContrl
Related
Is there a way to find all UIView items positioned over a given point? I have a Swift project with a custom keyboard. The footer has four buttons and the taps are not working. I think perhaps there's an overlapping view which is higher in the Z-order so it blocks the taps, but transparent so I can't see it.
I didn't write it so I'm not sure about what view might be doing this. If I can pick a point and find all views that cover that point then I could use reflection to find out which of our extensions of UIView it might be.
Thanks
Mike
If you came to this question based on the title but are not interested in Mongolian, you might be looking for this Q&A instead:
Swift: How can you rotate text for UIButton and UILabel?
I've been learning Swift in order to develop iOS apps for traditional Mongolian. The problem is that traditional Mongolian is written vertically from top to bottom and from left to right. My question is how do I display text vertically and still have line wrapping work?
If you stay with me for a minute, I'll try to explain the problem more clearly. Below is an image of the kind of text view I would like to achieve. In case the foreign script throws you off, I have included English text that follows the same pattern. In fact, if the app has any English text to display, this is how it should look.
For a simple one-line UILabel, a 90 degree clockwise rotation would work. However, for a multi-line UITextView I need to deal with line wrapping. If I just do a plain 90 degree rotation, the first thing written will end up being on the last line.
So far I have made a plan that I think can overcome this problem:
Make a custom font in which all of the letters are mirrored vertically.
Rotate the text view 90 degrees clockwise.
Mirror the text view horizontally.
That should take care of the text wrap.
I can do the mirrored font. However, I don't know how to do the Swift coding for the rotation and mirroring of the UITextView. I've found the following links that seem to give hints to parts of the solution, but they are all in Objective C and not in Swift.
How to rotate sub-views around their own centres?
Rotate UIView around its center keeping its size
iOS: Mirror content on screen
Mirroring UIView
There are traditional Mongolian apps in the app store (like this and this) but I haven't found anyone yet who is sharing their source code, so I don't know what they are doing behind the scenes to display the text. I plan to make my code open source so that it is not so hard for others in the future to develop apps for the several million people who read traditional Mongolian. Any assistance you can give to this endeavor would be much appreciated, not just by me but also by the Mongolian people. Even if you don't know yourself, upvoting this question to make it more visible would help.
Update
#sangonz's answer is still a great answer, but I temporarily unmarked it as the accepted answer because I just couldn't get everything to work. Specifically:
Enabling scrolling (either by embeding the custom view in a scrollview or by subclassing UIScrollView). In the github project, #sangonz said this should be easy, but it wasn't for me.
Getting a relayout (rather than stretching) of the word lines on an orientation change. I think this shouldn't be too hard to solve with a little more research.
Why don't the text lines go all the way to the edge of the view? There is a big gap at the bottom.
How to unlink the NSTextStorage of the custom vertical view from the other UITextView. (see this question)
Up to this point I have been using the original method I proposed above, but what I really want is to get something like what #sangonz proposed working.
I am also now considering alternate methods like
Using Core Text, Disadvantage: it feels like reinventing the wheel
Using WebKit, Disadvantage: Apple no longer uses WebKit for their UITextView
Edit: This is how I finally did it.
Here's a very basic implementation in my GitHub: Vertical-Text-iOS.
Nothing fancy, but it works. Finally I had to mix TextKit and image processing. Take a look at the code. It involves:
Subclassing NSTextContainer to get the right text dimensions.
Creating a custom UIView to render the text applying affine transformations to each line and rendering using NSLayoutManager to keep all TextKit features.
TextKit way
The proper way to keep all native text benefits (e.g. highlighting, selection...) is to use standard TextKit APIs. The method you are proposing would break all that or would possibly result in strange behaviour.
However, looks like TextKit in iOS does not support vertical orientation out-of-the-box yet, but it is prepared for that. As a side note, in OS X it is somewhat supported and you could call textView.setLayoutOrientation(.Vertical), but it still has some limitations.
The NSTextLayoutOrientationProvider protocol defines an interface
providing the default orientation for text laid out in a conforming
object, in absence of an explicit NSVerticalGlyphFormAttributeName
attribute. The only UIKit class that implements this interface is
NSTextContainer, whose default implementation returns
NSTextLayoutOrientationHorizontal. An NSTextContainer subclass that
handles vertical text could set this property to
NSTextLayoutOrientationVertical to support the custom layout
orientation logic.
Source: UIKit > NSTextLayoutOrientationProvider Protocol Reference for iOS
In conclusion, you should start subclassing NSTextContainer, and you will have to deal with NSLayoutManager and NSTextContainer a lot.
Custom image processing way
If, on the other hand you decide to follow your custom text rendering I suggest the following approach.
Render the normal text to a hidden layer with a normal font. Give it the correct size to its bounding box.
Get the text properties, mainly text height and line spacing.
Process the image drawing each line in reverse order from bottom to top as you can see in the image below. You should get a new CGImage as a result.
Rotate the image creating a UIImage and setting the correct UIImageOrientation value.
Insert that image into a UIScrollView that only allows horizontal scrolling.
Beware this method renders the whole text, so don't use it for very long texts. If you need to do that, you will need to consider a tiling approach. Watch WWDC 2013 > 217 - Exploring Scroll Views on iOS 7.
Good luck!
Update: (image from github project)
If you're going to rotate the text I would suggest using a right-to-left layout so that you can skip the mirroring step (and just rotate the other way).
You should be able to just set the label/textview's transform property:
view.transform = CGAffineTransformTranslate(CGAffineTransformMakeRotation(CGFloat(-M_PI_2)), view.bounds.width, view.bounds.height)
You need to translate after you rotate because the view rotates around its origin (in the upper left).
The good news is that gestures and taps are transformed at the same time the pixels are, so controls continue to work the way you expect them to.
I am trying to achieve horizontal page scrolling effect (partial view, not of the entire screen scrolling), like in the HGPageScrollView component.
I am a fairly novice iOS programmer, and I am having difficulty finding the parts of the code which provide just the horizontal scrolling with the swipe gesture. So I am looking for any help, either some sample code, or pointers to the code in the HGPageScrollView, which provide just the horizontal scrolling functionality (i.e. not even the UIPageControl dots at the bottom, just the vanilla scroll).
I am only looking for an implementation which works in iPhone landscape orientation, if that makes it any easier.
Why I am not using HGPageScrollView:
It is not ARC compliant.
It does way more than I need it to, I am just looking for the scrolling.
Consequently, it is proving quite difficult for me to find where to remove all the features I do not need, like clicking on page to change the scrolling mode to full screen (HGPageScrollViewModePage)
I would like to use this as an incentive to learn more about the components available in cocoa-touch, and roll my own implementation.
I think this question might be suggesting the solution, but I do not know how to implement it. I guess I don't fully understand it, as there aren't enough details for my novice skills to go on.
Use a UICollectionView and set the pagingEnabled property to YES.
If you want to do complex layouts of the items (like in your example above where items are split on both sides of the screen) you may want to provide your on UICollectionViewLayout: https://developer.apple.com/library/ios/documentation/UIKit/Reference/UICollectionViewLayout_class/Reference/Reference.html#//apple_ref/occ/cl/UICollectionViewLayout
I've been looking around here and seeing lots of questions that seem related, but I haven't found anything that's exactly what I need.
I have three UIViews that are animating inside a custom viewController. I want there to be a static background inside the viewController that is only revealed within the clipping bounds of the UIViews.
It's kind of like spotlights on a prison yard: the background should stay in one place, but as the spotlights move you can see different parts of it. Except that I don't need circles, regular old UIView frames are fine.
For instance, it seems like what I need is in the answer to this question: How to achieve dynamic UIView masking?
...the answerer provides a link to a page that shows how to statically mask an image, and then the answerer says "But personally I think i would make 2 UIImage views and crop the content of the draggable UIView"--without any info on how to do that.
How do you do that?
I have a simple app that has a set of coloured views, one red, one green and one blue.
I am trying to make it so that when a swipe gesture is made the current view will switch to the next one in the list in a fluid manner, it looks like moving a long piece of paper with different colours on it.
Is there a way to do this (CoreAnimation)?
You could first look into UIScrollView. It seems to me that what you are trying to accomplish is the same you have, say, in Mobile Safari on an iPhone, when you show all your current pages and can go from one to the next by scrolling. This tutorial is particularly close to what you describe.
If you are looking into more advanced kind of transformations, than Core Animation would be the option.
Actually, nothing prevents using both approaches, UIScrollView to handle the swipe, Core Animation to add more animation to the pack...
You could use a UIScrollView to accomplish this. Add all of your colored views as subviews to the scroll view. Make sure your contentSize is setup appropriately and optionally setup paging to make the scrolling always snap to a certain border. See the scroll view programming guide for more info Scroll View Programming Guide