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ios: programmatically ask for Game Center sign-in?

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问题 I have a simple question, but I’ve looked through Apple’s documentation and done some searching and I can’t find the answer to it. Is it possible to programmatically pull up Game Center’s sign-in view? I have a UIButton that requires Game Center, and if the client does not sign in when the app is opened (iOS pulls up the sign-in view at launch), I want to provide a second chance for the user to sign in. 回答1: I'm assuming you're calling this GKLocalPlayer method on launch:

Grey area in Google maps

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问题 I have implemented Google maps in my app (in a modal), however as you can see on the images below there is a grey area that I of course want to get rid of. It is possible to move the map so that the grey area disappears, but that shouldn't be needed. Thing is that the map is shown inside a modal box, which contains of a lot of content that's dynamically created when the button for showing the modal is clicked. It seems that the problem could be that the map content isn't fully loaded before

Show Dialog box at center of its parent

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It's been a mess to show a DialogBox at the center of its parent form. Here is a method to show a dialog. I am positioning its parent to center but not able to center the DialogBox private void OpenForm(Object point, Object height, Object width) { FormLoading frm = new FormLoading(); Point temp = (Point)point; Point location = new Point(temp.X + (int)((int)width) / 2, temp.Y + (int)((int)height) / 2); frm.Location = location; frm.ShowDialog(); } private void btnView_Click(object sender, EventArgs e) { try { ThreadStart starter= delegate { OpenForm(currentScreenLocation, this.Height, this.Width

Two HTML tables side by side, centered on the page

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I have two tables on a page that I want to display side by side, and then center them within the page (actually within another div, but this is the simplest I could come up with): <style> #outer { text-align: center; } #inner { text-align: left; margin: 0 auto; } .t { float: left; } table { border: 1px solid black; } #clearit { clear: left; } </style> <div id="outer"> <p>Two tables, side by side, centered together within the page.</p> <div id="inner"> <div class="t"> <table> <tr><th>a</th><th>b</th></tr> <tr><td>1</td><td>2</td></tr> <tr><td>4</td><td>9</td></tr> <tr><td>16</td><td>25</td></tr

How to center an image that is wider than the browser window (not a background image)

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问题 How can I centre a large image to the browser window, so that if it is wider than the window it will still be centred? See: http://carolineelisa.com/rob/ I did not want to simply make the image a background image, as it changes dynamically to images of different sizes and I want to to be able to scroll down to see them at the correct heights. However I am open to making it a background image if the height of the container div can change depending on the background image height? I don't mind

Center Contents of Bootstrap row container

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I have the code below and I'd like to center the "well" elements of the outer "row" div. I've tried various approaches such as text-align: center (which just centers the text and not the inner DIV elements. Here is a jsfiddle . The idea is that I get a page of "well" tiles and that after 4 or so it wraps. But if it is less than 4, they should appear centered on the page. <body class="container-fluid"> <div class="row"> <div class="well span2"> <div class="row"> <div class="span2"> Header </div> </div> <div class="row"> <div class="span2"> Sub Header </div> </div> </div> <div class="well span2"

Center an item with position: relative

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I've got a menu that appears on hover over an absolutely positioned div. All of the menu items have to be relatively positioned because the absolutely div will appear multiple times on a page and will appear in multiple sizes in one instance. How would I center multiple items with position: relative both vertically and horizontally when I won't know the the size of the parent div? I know the position: absolute trick with negative margins, but this situation calls for something different. Here's the code: .OuterCase { position : absolute; width : 100%; height : 100%; text-align: center; }

Self resize and center a window using javascript (no jquery) on page load

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问题 This is not something we'd normally do but we're trying load a video into the blank window opened by a clickTag (from a banner ad) - and make it feel like a modal window as much as possible. Is it possible to use javascript to self-resize the blank window opened by the clickTag and center it on the screen? We can't apply anything to the link that is clicked so... Everything has to self-run as the page loads If possible, it would be nice to not see the browser tabs and address bar We're not

Centering No Captcha reCaptcha

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After a few hours of research and trial and error, I was finally able to add the new Google No Capatcha re Capatcha to my form and get it working, but for some reason, it won't center. Any ideas?  <div id="capatcha"> <div class="g-recaptcha" data-sitekey=""></div> </div> #capatcha { margin: 0 auto; display: block } jxmallett I went with: <style> /* already defined in bootstrap4 */ .text-xs-center { text-align: center; } .g-recaptcha { display: inline-block; } </style> <div class="text-xs-center"> <div class="g-recaptcha" data-sitekey=""></div> </div> This is similar to other

Can overflow text be centered?

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When I specify text-align:center for an element with a width that is greater than the width of the text, the text is centered within the content box of the element (as expected). When I specify text-align:center for an element with a width that is less than the width of the text, the text is aligned to the left edge of the content box and overflows the right edge of the content box. You can see the two cases in action here . Can any CSS magic make the text equally overflow both the left edge and the right edge of the content box, so that it stays centered? I know this question is old, but I