From the apple developer website after a quick search:

&gt; Avoid transparency. An app icon should be opaque. If the icon’s boundaries are smaller than the recommended sizes—or you use transparency to create “see-through” areas—the resulting icon can appear to float on a black background, which tends to look especially unattractive on the beautiful wallpapers that users choose.

https://developer.apple.com/ios/human-interface-guidelines/icons-and-images/app-icon/

Edit: Also, check the related questions before you confirm your post - https://stackoverflow.com/questions/959864/is-is-possible-to-use-transparency-in-an-iphone-app-icon?rq=1

On IOS use just square icons, if you use rounder icons you will have black margin black background.

    #define DEFINE_STAT(Stat) \
	struct FThreadSafeStaticStat&lt;FStat_##Stat&gt; StatPtr_##Stat;

The above line is take from Unreal 4, and I know I could ask it over on the unreal forums, but I think this is a general C++ question that warrants being asked here.

I understand the first line defines a macro, however I am not well versed in preprocessor shenanigans in C++ and so I&#39;m lost over there. Logic tells me the backslash means the declaration continues onto the next line.

FThreadSafeStaticStat looks a bit like a template, but there&#39;s #&#39;s going on in there and a syntax I&#39;ve never seen before in C++

Could someone tell me what this means? I understand that you may not have access to Unreal 4, but it&#39;s just the syntax I don&#39;t understand.

What does ## (double hash) do in a preprocessor directive?

I am trying to create an hashed password for Laravel. Now someone told me to use Laravel hash helper but I can&#39;t seem to find it or I&#39;m looking in the wrong direction. 

How do I create a laravel hashed password? And where?

Edit:
I know what the code is but I don&#39;t know where and how to use it so it gives me back the hashed password. If I get the hashed password then I can manually insert it into the database

How to create a laravel hashed password

I have added an icon to my app. It has rounded edges and no background. The problem is that when I run an app on my device (iPhone 5) the icon has a black background behind the edges as if it wasn&#39;t transparent. Any solutions?

iOS app icon with transparent background showing black background on device

<p>I have added an icon to my app. It has rounded edges and no background. The problem is that when I run an app on my device (iPhone 5) the icon has a black background behind the edges as if it wasn't transparent. Any solutions?</p>


I have `UICollectionView` with horizontal scrolling and there are always 2 cells side-by-side per the entire screen. I need the scrolling to stop at the begining of a cell. With paging enabled, the collection view scrolls the whole page, which is 2 cells at once, and then it stops.

I need to enable scrolling by a single cell, or scrolling by multiple cells with stopping at the edge of the cell.

I tried to subclass `UICollectionViewFlowLayout` and to implement the method `targetContentOffsetForProposedContentOffset`, but so far I was only able to break my collection view and it stopped scrolling. Is there any easier way to achieve this and how, or do I really need to implement all methods of `UICollectionViewFlowLayout ` subclass? Thanks.

Paging UICollectionView by cells, not screen

I&#39;m submitting ios game to app store. 

xcode gives me error Improper advertising identifier [IDFA] usage. Your app contains the Advertising Identifier [IDFA] API but you have not indicated its usage on the Prepare for Upload page in iTunes Connect. 

How to fix this?
Any help appritiated.

improper advertising identifier [IDFA] usage

I&#39;m using cocoapods to manage my dependencies. All have been working fine. Now, When I&#39;m creating a new project, added the following to my podfile,

    platform :ios, &#39;6.1&#39;
    pod &#39;RestKit&#39;, &#39;~&gt;  0.20.0&#39;

when i&#39;m doing pod install, it is continually staying on **analyzing dependencies**.

Any idea why this problem?



Cocoapods staying on &quot;analyzing dependencies&quot;

I use `UITabBarController` as a root view and app supports iOS 6 and above. Project class hierarchy is as below.

    UITabBarController
      - tab1
        - UINavigationController
          - UIViewController
          - UIViewController
          .
          .
      - tab2
        - UINavigationController
          - UIViewController
          - UIViewController
          .
          .
          .
      - tab3
        - UIViewController
      - tab4
        - UIViewController

I used below code to change height of `UITabBar` in one of the UIViewControllers (which is inside `UINavigationController`) in above hierarchy.

    CGRect tabbarFrame = self.tabBarController.tabBar.frame;
    tabbarFrame.size.height += 60;
    self.tabBarController.tabBar.frame = tabbarFrame;

But its not changing the height. `UITabBar` is displayed with default height. Though logging its value prints changed value as shown below.

    &lt;UITabBar: 0xb528f60; frame = (0 431; 320 109); autoresize = W+TM; layer = &lt;CALayer: 0xb529080&gt;&gt;

How can I change `UITabBar`&#39;s height to achieve something like this:?

 
![enter image description here][1]


  [1]: http://i.stack.imgur.com/wuStl.png

Change UITabBar height

I&#39;m trying to generate a view with a gradient color background (A solid color to transparent) at runtime. Is there a way of doing that?


Programmatically create a UIView with color gradient

as per title, my question is: Does Android provide any way to analyze/determine if a color (that will be obviously dynamic for the purpose) is light or dark?



Check if color is dark or light in Android

I have implemented silent push notifications but I have noticed some strange behaviour.  The silent push notifications are handled via:

    - (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler

The silent push messages only seem to be received if the device is charging (ie cable connected) and/or if my app is foreground.

If I disconnect the device from the charger (or Mac) then the silent push notifications are no longer received *unless* the app is foreground.

I get non-silent push notifications normally in both cases.

If I plug in the USB cable again, then I get the expected behaviour and silent push notifications are received irrespective of whether the app is foreground or background.

I am using UILocalNotification so I know what is being received.

The fact that it all works fine with the device connected suggests that my silent pushes notifications are configured correctly and that the app has the correct background modes set in the plist etc.

This behaviour is repeatable on iPhone 5s, 6 and iPad 2 all running either IOS 8 or 8.1.

Has anyone else experienced this?  It should be easy to reproduce.  Why should the simple act of plugging a device into a charger change the ability to receive silent push notifications?


Silent push notifications only delivered if device is charging and/or app is foreground

How can I set a background image for my main view controller in Xcode 6 using swift? I know that you can do this in the assistant editor as below:    

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor.yellowColor()
    }


What is the code to set the background to an image I have in my assets folder?

How to set a background image in Xcode using swift?

I want to do transparent background on CardView.
I know backgroundColor but i have image on my Layout.

Do you know how do it? Or something which work as cardview but i will set a transparent background? 

Regards

Transparent background on CardView - Android

`HKObserverQuery` has the following method that supports receiving updates in the background:

    - initWithSampleType:predicate:updateHandler:

The `updateHandler` has a `completionHandler` which has the following [documentation](https://developer.apple.com/library/prerelease/ios/documentation/HealthKit/Reference/HKObserverQuery_Class/index.html):

&gt; This block is passed to the update handler. You must call this block
&gt; as soon as you are done processing the incoming data. Calling this
&gt; block tells HealthKit that you have successfully received the
&gt; background data. If you do not call this block, HealthKit continues to
&gt; attempt to launch your app using a backoff algorithm. If your app
&gt; fails to respond three times, HealthKit assumes that your app cannot
&gt; receive data, and stops sending you background updates.

From looking at other posts it seems like there&#39;s a lot of confusion revolving around this handler. Below are some questions that I have about it:

- When should the handler be called? If called too late, then HK might think that the app never received the query update causing you to hit the background update 3-strikes back-off algorithm. The documentation states that it should be called after handling other queries. Depending on how long it would take to run those queries, it sounds like you could get dangerously close to hitting the background update strikes.
- Why is this needed? Shouldn&#39;t the system know that the app has been launched and has received the background update? When using `CoreBluetooth` in the background it just wakes your app up in the background for 10 seconds. No need to call any handler or deal with the background update 3-strikes.
- If you hit the background update 3-strikes and HK stops sending updates is that permanent? Does HK ever start sending the background updates again? What if there&#39;s a bug that prevented the handler to be called and now you&#39;ve fixed it. Is the app stuck never receiving the updates? Or will it reset when the app is re-launched or updated?
- Does HK keep your app running in the background until the handler is called? Is that part of its purpose or just a side effect? If it&#39;s part of its purpose how long can we run before needing to stop (and hit the first background update strike)?

iOS : Use of HKObserverQuery&#39;s background update completionHandler

I know how to use images in iOS application. But I don&#39;t know how to use default images like share or bookmark icons which are mention in developer site.

I want to use them. Do I need to download those set of images or those are available in Xcode?

If we have to download them, where I can get those icons?

How to use default iOS images?

I&#39;m wondering why so few modern web sites still use only PNGs for icons (but this assumption is just based my observation). So far I know, main reasons for using PNGs over SVGs are IE8 and that SVG uses more CPU power (but I don&#39;t believe this is any issue for simple 1K icons). I can see (and we currently use) many advantages in using SVGs, either when it&#39;s used as sprites, as images, or as inline SVG.

(Question https://stackoverflow.com/questions/21303801/looking-for-a-research-png-sprite-vs-svg-sprite-vs-icon-fonts focuses on performance and doesn&#39;t have relevant answer, https://stackoverflow.com/questions/23952828/icon-font-vs-svg-caching-and-network-concern focuses on network traffic, but it&#39;s easily solvable by e.g. templating.)

If new web site supports only modern browsers, is there any reason for not using SVGs (or - is there any reason for using PNGs for icons)? If we don&#39;t care about IE8 and the use of SVG is backed up by templating and/or caching, is there any catch to rely only on SVGs?

SVG icons vs. PNG icons in modern web sites

What does the red dot (circle) next to the app name below the app icon mean?

![enter image description here][1]

I added a Today Extension (Widget) to the app. It appears only when I launch the app on the iOS 8, it does not appear on iOS 7 simulator. Even though I removed the extension and cleared the simulator, it still appears before the app name.


  [1]: http://i.stack.imgur.com/i6fKr.png

Red dot (circle) next to the app name below the app icon on the iPhone Home Screen on iOS 8

How do I set the images so that I can archive and validate my app? The screen looks like this now:

![enter image description here][1] 

So the first one says `29pt`, but then it also says `2x`. So do I put a `29x29` image or a `58x58` image? And where do I put all of the other ones? (I know that there are more sizes than `29`, `40`, and `60`).

Anyway, what I tried was I dragged a `29x29` png onto the first slot, a `40x40` onto the second, and a `60x60` onto the third and fourth. When I went to `Product-&gt;Archive`, I get 

&gt;/Users/kendon/Documents/iPhone Apps/Sales Tool/Sales Tool/Images.xcassets: The app icon set named &quot;AppIcon&quot; did not have any applicable content.

  [1]: http://i.stack.imgur.com/PU5lU.png

iOS how to set app icon and launch images

I am using a android.support.v7.widget.Toolbar and learned from [this post][1] how to change the color of the hamburger icon to white, but the up/back arrow remains a dark color when I call

    setDisplayHomeAsUpEnabled(true);

How can I make the arrow white as well?

Here is what my toolbar looks like when I call setDisplayHomeAsUpEnabled():

![enter image description here][2]

...and here is the relevant portion of my styles.xml file:

    &lt;style name=&quot;AppTheme&quot; parent=&quot;Theme.AppCompat.NoActionBar&quot;&gt;
        &lt;item name=&quot;colorPrimary&quot;&gt;@color/primary&lt;/item&gt;
        &lt;item name=&quot;colorPrimaryDark&quot;&gt;#194C5F&lt;/item&gt;
        &lt;item name=&quot;colorAccent&quot;&gt;@color/accent&lt;/item&gt;
        &lt;item name=&quot;drawerArrowStyle&quot;&gt;@style/WhiteDrawerIconStyle&lt;/item&gt;
    &lt;/style&gt;
    
        &lt;style name=&quot;WhiteDrawerIconStyle&quot; parent=&quot;Widget.AppCompat.DrawerArrowToggle&quot;&gt;
            &lt;item name=&quot;spinBars&quot;&gt;true&lt;/item&gt;
            &lt;item name=&quot;color&quot;&gt;@android:color/white&lt;/item&gt;
        &lt;/style&gt;

    


  [1]: https://stackoverflow.com/a/27152138/335640
  [2]: http://i.stack.imgur.com/UvSv8.png

How to change Toolbar home icon color

I&#39;m trying to make a plot in matplotlib with transparent markers which have a fixed color edge . However, I can&#39;t seem to achieve a marker with transparent fill. 

I have a minimum working example here:

    import numpy as np
    import matplotlib.pyplot as plt

    x = np.arange(10)
    y1 = 2*x + 1
    y2 = 3*x - 5

    plt.plot(x,y1, &#39;o-&#39;, lw=6, ms=14)
    plt.plot(x,y2, &#39;o&#39;, ms=14, markerfacecolor=None, alpha=0.5, markeredgecolor=&#39;red&#39;, markeredgewidth=5)

    plt.show()

I tried two techniques I found online to achieve this:
1) Setting alpha parameter. However, this makes the marker edge transparent too, which is not the desired effect.
2) Setting markerfacecolor=None, although this has no effect on my plot

Is there a solution to this please?


Plotting with a transparent marker but non-transparent edge

API Level &lt; 21 

Thumb is transparent, as expected.

![Screenshot taken on a Nexus 5 running Android 4.4.4][1]


On API Level 21

Thumb is opaque, Wonder why.

![Screenshot taken on a Nexus 5 running Android 5.0][2]


Here is the code

     &lt;SeekBar
                    android:id=&quot;@+id/ui_audioplayer_progressbar&quot;
                    android:layout_width=&quot;match_parent&quot;
                    android:layout_height=&quot;wrap_content&quot;
                    android:progressDrawable=&quot;@drawable/custom_progress_bar_horizontal&quot;
                    android:thumb=&quot;@drawable/stud_slider&quot; /&gt;


Interestingly, this problem can be seen and reproduced in the xml preview in eclipse itself, when you change the API Level perspectives. 

![When API level 21 is selected][4]


![When API level 19 is selected][3]


Note: 

 - I run the same apk on both devices.
 - Both devices are of the same make and model, i.e Nexus 5.
 - The thumb image is a PNG with a transparent background, as apparent from the screenshot for API Level &lt; 21

 

Is this a known bug in Lollipop or am i doing something wrong?


  [1]: http://i.stack.imgur.com/OJGrZ.png
  [2]: http://i.stack.imgur.com/1tu0P.png
  [3]: http://i.stack.imgur.com/dKnQH.png
  [4]: http://i.stack.imgur.com/MWmx4.png

Seek Bar thumb not transparent in Android 5.0 API 21 Lollipop

My python code creates a plotly Bar plot but the background is white in color i want to change it into transparent color is that doable 

***My Code:***

    import plotly.plotly as py
    from plotly.graph_objs import *
    py.sign_in(&#39;username&#39;, &#39;api_key&#39;)
    data = Data([
    Bar(
        x=[&#39;Sivaranjani S&#39;, &#39;Vijayalakshmi C&#39;, &#39;Rajeshwari S&#39;, &#39;Shanthi Priscilla&#39;, &#39;Pandiyaraj G&#39;, &#39;Kamatchi S&#39;, &#39;MohanaPriya&#39;, &#39;Madhumitha G&#39;, &#39;Franklin Alphones Raj J&#39;, &#39;Akfaris Almaas&#39;, &#39;Biswajit Champati&#39;, &#39;Priya R&#39;, &#39;Rekha Rajasekaran&#39;, &#39;Sarath Kumar B&#39;, &#39;Jegan L&#39;, &#39;Karthick A&#39;, &#39;Mahalakshmi S&#39;, &#39;Ragunathan V&#39;, &#39;Anu S&#39;, &#39;Ramkumar KS&#39;, &#39;Uthra R&#39;],
        y=[1640, 1394, 1390, 1313, 2166, 1521, 1078, 1543, 780, 1202, 1505, 2028, 2032, 1769, 1238, 1491, 1477, 1329, 2038, 1339, 1458],
        text=[&#39;Scuti&#39;, &#39;Scuti&#39;, &#39;Cygni&#39;, &#39;Scorpii&#39;, &#39;Scuti&#39;, &#39;Pollux&#39;, &#39;Scorpii&#39;, &#39;Pollux&#39;, &#39;Scuti&#39;, &#39;Pollux&#39;, &#39;Scorpii&#39;, &#39;Scorpii&#39;, &#39;Scuti&#39;, &#39;Cygni&#39;, &#39;Scorpii&#39;, &#39;Scuti&#39;, &#39;Scuti&#39;, &#39;Pollux&#39;, &#39;Scuti&#39;, &#39;Pollux&#39;, &#39;Pollux&#39;])])
    plot_url = py.plot(data)

***The graph looks like this***

![enter image description here][1]


  [1]: http://i.stack.imgur.com/KudRA.jpg

Content Type	Original Author	Original Content on Stackoverflow
Question	Fengson	View Question on Stackoverflow
Solution 1 - Ios	Lex Webb	View Answer on Stackoverflow
Solution 2 - Ios	Orsos Patrick	View Answer on Stackoverflow

iOS app icon with transparent background showing black background on device

Ios Problem Overview

Ios Solutions

Solution 1 - Ios

Solution 2 - Ios

How to create a laravel hashed password

What does ## (double hash) do in a preprocessor directive?

Attributions