display rating stars xcode - xcode

In a new xCode project i'm parsing a rating for example 3,5. But i want to display this score in my App. Not as a text but as in images like 3 filled stars and 1 halve filled star. Is there a way to do it? Yes? How i can do this?
What elements i need to work to display the stars? Could somebody help me out?
Like in the App Store

There would be several different approaches for this, like creating a UIView subclass that would implement a method for filling itself with UIImageviews (that would represent full or half stars) depending on rating but if you want to avoid reinventing the wheel you can find several iOS components that will do the job. Some of them can be found here.

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Vaadin 23 Excel like grid

I'm in the need of an Excel like grid in an attempt to convert an "application" written in Google Calc to a real application. I've got one implementation using Vaadin, but it (also) suffers from a long page construction. The screenshot below uses a CSS flex grid with individual divs, and given 6 weeks, there are over 5000 individual divs.
Constructing this page takes over 20 seconds, not something users will be happy about. I'm working on a version based on a table, but it does not seem to improve much. In the end the same amount of cells need to be constructed, whether they are DIVs or TDs does not seem to matter much.
Is there a way to construct such a grid in a more speedy way? I'm more than happy to solve "where did the user click?" on the server side. To be aware of: besides the number of cells themselves, each also has specific content, so just getting a grid shown is not enough.
Each component (div, or something else) is managed by the server. So when you have 5000 of them it's quite slow. You need to reduce the number of components managed by the server.
I can't give you a better answer since I don't know the requirements. But the idea is to try to combine some elements.
You have an example of a table generated ( instead of each element one by one) here: https://cookbook.vaadin.com/grid-details-table.
You can also create or own component. There is also a paid add-on: spreadsheet which seems to fit your needs. It's still in preview: https://vaadin.com/roadmap
The problem here is the complexity of the UI itself. Rendering 5000+ cells will be slow what ever method you use and what ever framework you use. There will be big amount of elements in the DOM and you need to load also lot of data upfront. And as you see the result is huge, and it wont fit most screens. So I would recommend further design of the UI. Is it really necessary to show all the weeks at once? Your UI's complexity will already reduce a lot if you show only one week at the time and add buttons to browse the weeks forwards and backwards. But even with that optimization you will have lot of columns. I would consider adding another browsing direction by day. Further knowledge of the actual purpose of the UI will naturally give more insight how to develop it further.

Optimize UI layers in a listview (+screenshots)

I'm analyzing my approach with Gmail's android developer's team approach in order to optimize drawing times and generally create more efficient apps.
My approach:
Below is the hierarchy inside a listview. It's quite straightforward. ExpandableListContentItem extends a Relative layout which has 3 Views:
Gmail app:
The following screenshot is how the listview in Gmail app works (SwipableListView). It's interesting to see that there is only one View (I guess aY extends ConvertationItemView) which in reality is quite more complicated than mine (I see 3 texts, 1 photo, 1 icon/button).
Question:
I would assume that this is a more lightweight approach to get rendered, is it so? Even if it takes me more time to code an optimal single customview per listview item it is worth the performance that it offers?
Finally the only way I know so far is to inflate an existing view inside another which is basically the first approach. I guess now my challenge would be to combine that relativeLayout with the 3 nested views into one. Is that correct?
PS:examples, open source code are welcome.
I would assume that this is a more lightweight approach to get rendered, is it so?
Yes it is. When you consider hierarchy, every parent measures their dimensions and passes it to child views from top to bottom. Reducing layers and having more flat view will save time.
Even if it takes me more time to code an optimal single customview per listview item it is worth the performance that it offers?
Depends on application you are developing. Depends on number of items in a list and how you get them. When you scroll through the list, if you think it is slow you might want to try that approach. I tried it on my previous applications and I could see the difference.
I guess now my challenge would be to combine that relativeLayout with the 3 nested views into one.
I don't know what you mean by combining them but the way Gmail does it that they have their Custom View. You can create your custom view.
Besides that, another thing to consider is overdraw. It is as important as having flat views. If you activate GPU Overdraw from developer tools and look at Gmail app row, you will see 0 overdraw. Make sure your code has no overdraw.
For further reading I would recommend you to check these blogs :
Performance Tuning On Android
Android Performance Case Study

VTK display multiple images

Does someone knows how to display multiple images using ActiViz or VTK?
I have a RenderWindowControl, I would like to either display all the images like in a list in there or add multiple RenderWindowControls to display the multiple images..
Thanks!
You have some choices, for the task of visualize multiple images. I hope that at least one of them represents what you want to achieve:
1- Using multiple render windows. Basically, the example provided in the link creates an array of vtkRenderWindowInteractor objects, so that you can visualize multiple images.
2 - Using a single render window with viewports. The render window is splitted into viewports (renderer->SetViewport is the key, here), so that you can visualize n images at a time, where n is the number of viewports.
3 - Using the "slices" approach (the example works on DICOM files). This implements the "list" behaviour, as you said in your question. Basically, you visualize an image at a time, but you can navigate through them simply by pressing the arrow keys. The example derives the vtkInteractorStyleImage class to catch the events regarding key pressures.

Lightbox for Flex

Ey. I've seen the other post about Lightbox gallery effect for Flex, but after having played around with it I cant seem to get it to work 100% (The image is as small as the thumb, and I cant make it bigger). And this also lacks some functionality I'd like to have.
So, one example would be, of course, this: http://lokeshdhakar.com/projects/lightbox2/
If you click any image on the image set you can swap between them with an arrow. This is what I'd like to have.
Also, it would be nice if it was possible to display the thumbnails for the other images in the same set under the bigger picture(when one image is already clicked).
I've tried to search for components like this, but I cant seem to find any other.
If any of you know of any nice components or snippets of code for this kind of effect then please let me know! =)
Kind regards,
Stian Berg Larsen
  
EDIT:
So I've searched around and tried a number of examples, but I cant seem to get any of them to work. There is always an error, and none of the examples are exactly what I want.
I simply need a way to show images like Lightbox. With a prev/next arrow and maybe a close button. Nothing more than that. How would I go about making this, or use an existing component?
Im using a TileGroup to hold all my thumbs (so that they will fill out the width of the Group with more images if there are room for it). If it's possible to generate this list of thumbnails dynamically too then that would be great, but basically what I need is to show images with a Lightbox style when I click them.
Thanks! =)
I ended up just making my own lightbox effect. :)
Created an Actionscript class (based on Group) and added image loading functionality, prev/next/close buttons and borders and such. Works like a charm :)

Xcode app design - loop easier?

I'm pretty new to programming and want some advice on the basic app structure so forgive me if this is pretty obvious.
The main part of the app is a series of 20 pairs of views which the users moves through sequentially (1a,1b,2a,2b,3a etc). Each a view and b view have the same layout as other a/b's but have different image, audio and text.
I could set out all 40 views in storyboard in one long line but that seems like I'm duplicating a lot of work (as well as creating a larger size app) although it would be conceptually very simple (and more stable?)
Alternatively I could just have two views (a and b) with all the content and some sort of counter so that Xcode would know which content to serve up depending on where the user is in the sequence. What would be the easiest way to implement this? I'm afraid however that this could also get unwieldy and perhaps keeping it simple really is the way to go.
Any advice gratefully received.
Many thanks
Design is totally dependent on complexity of screens not on the number of screen. If Screen won't have much variation then you can go for second approach having only 2 views and conditionally loading the data.
Alternatively if you want to go with approach first you won't need to duplicate all the steps. You can programatically create two super class which contains all the functionalities, and the part which varries for that you can create separate class(Inheritance concept). This will make the thing easier, you can reuse the code as well as increase the maintainability of app.

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