{"id":490,"date":"2013-10-24T21:55:36","date_gmt":"2013-10-24T19:55:36","guid":{"rendered":"http:\/\/www.albertopasca.it\/whiletrue\/?p=490"},"modified":"2018-05-25T16:57:19","modified_gmt":"2018-05-25T14:57:19","slug":"objc-digital-clock-using-iboutletcollection","status":"publish","type":"post","link":"https:\/\/www.albertopasca.it\/whiletrue\/objc-digital-clock-using-iboutletcollection\/","title":{"rendered":"Objc \u2013 Digital clock using IBOutletCollection"},"content":{"rendered":"<p>Today, a simple snippet to learn how to use\u00a0<strong>IBOutletCollection<\/strong>\u00a0and\u00a0<strong>image sprites<\/strong>in your applications.<\/p>\n<p><strong>IBOutletCollection<\/strong>\u00a0are introduced with\u00a0<em>iOS4<\/em>\u00a0as you can see on Apple iOS diff guide (\u00a0<a href=\"http:\/\/developer.apple.com\/library\/ios\/releasenotes\/General\/iPhone40APIDiffs\/\" target=\"_blank\" rel=\"noopener\">http:\/\/goo.gl\/C8NRZz<\/a>\u00a0) and are a\u00a0<strong>collection of IBOutlets<\/strong>.<\/p>\n<p><!--more--><\/p>\n<p>[code lang=&#8221;java&#8221; autolinks=&#8221;false&#8221; collapse=&#8221;false&#8221; firstline=&#8221;1&#8243; gutter=&#8221;true&#8221; htmlscript=&#8221;false&#8221; light=&#8221;false&#8221; padlinenumbers=&#8221;false&#8221; smarttabs=&#8221;true&#8221; tabsize=&#8221;4&#8243; toolbar=&#8221;false&#8221;]@interface\u00a0APViewController\u00a0:\u00a0UIViewController<br \/>\n{<br \/>\n  IBOutletCollection\u00a0(UIView)\u00a0NSArray\u00a0*_digitViews;<br \/>\n  NSTimer\u00a0*_timer;<br \/>\n}[\/code]<\/p>\n<p>That you can connect in the classic way:<br \/>\n<a href=\"https:\/\/i0.wp.com\/www.albertopasca.it\/whiletrue\/wp-content\/uploads\/2013\/10\/ib-guide.png\" target=\"_blank\" rel=\"noopener\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2760\" src=\"https:\/\/i0.wp.com\/www.albertopasca.it\/whiletrue\/wp-content\/uploads\/2013\/10\/ib-guide.png?resize=639%2C287\" alt=\"ib-guide\" width=\"639\" height=\"287\" \/><\/a><\/p>\n<p>To read and use these connected views, loop the array and extract the UIView:<\/p>\n<p>[code lang=&#8221;java&#8221; autolinks=&#8221;false&#8221; collapse=&#8221;false&#8221; firstline=&#8221;1&#8243; gutter=&#8221;true&#8221; htmlscript=&#8221;false&#8221; light=&#8221;false&#8221; padlinenumbers=&#8221;false&#8221; smarttabs=&#8221;true&#8221; tabsize=&#8221;4&#8243; toolbar=&#8221;false&#8221;]-\u00a0(void)viewDidLoad<br \/>\n{<br \/>\n  [super viewDidLoad];<\/p>\n<p>  UIImage\u00a0*digits\u00a0=\u00a0[UIImage imageNamed:@&quot;numbers.png&quot;];<br \/>\n  for\u00a0(\u00a0UIView\u00a0*view\u00a0in\u00a0_digitViews\u00a0)<br \/>\n  {<br \/>\n    view.layer.contents\u00a0=\u00a0(__bridge \u00a0id)digits.CGImage;<br \/>\n    view.layer.contentsRect\u00a0=\u00a0CGRectMake(0,\u00a00,\u00a00.1,\u00a01.0);<br \/>\n    view.layer.contentsGravity\u00a0=\u00a0kCAGravityResizeAspect;<br \/>\n  }<\/p>\n<p>  _timer\u00a0=\u00a0[NSTimer\u00a0scheduledTimerWithTimeInterval:1.0\u00a0target:self<br \/>\n      selector:@selector(tick)<br \/>\n      userInfo:nil\u00a0repeats:YES];<\/p>\n<p>  [self tick];<br \/>\n}[\/code]<\/p>\n<p>Now, we add an image, this one:<br \/>\n<a href=\"https:\/\/i0.wp.com\/www.albertopasca.it\/whiletrue\/wp-content\/uploads\/2013\/10\/numbers.png\" target=\"_blank\" rel=\"noopener\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2761\" src=\"https:\/\/i0.wp.com\/www.albertopasca.it\/whiletrue\/wp-content\/uploads\/2013\/10\/numbers.png?resize=626%2C88\" sizes=\"auto, (max-width: 626px) 100vw, 626px\" srcset=\"http:\/\/www.albertopasca.it\/whiletrue\/wp-content\/uploads\/2013\/10\/numbers-300x42.png 300w, http:\/\/www.albertopasca.it\/whiletrue\/wp-content\/uploads\/2013\/10\/numbers.png 626w\" alt=\"numbers\" width=\"626\" height=\"88\" \/><\/a><br \/>\nclick to open in a new window, and add to your project.<\/p>\n<p>This is our sprite. Do you know what is a sprite, true?<br \/>\n[\u00a0<a href=\"http:\/\/en.wikipedia.org\/wiki\/Sprite_(computer_graphics)\" target=\"_blank\" rel=\"noopener\">http:\/\/en.wikipedia.org\/wiki\/Sprite_(computer_graphics)<\/a>\u00a0]<\/p>\n<p>Now, the view are connected, the image before is imported on your project, it\u2019s\u00a0<em>time to code<\/em>\u00a0a little bit!<\/p>\n<h6>Load a number from the sprite:<\/h6>\n<p>[code lang=&#8221;java&#8221; autolinks=&#8221;false&#8221; collapse=&#8221;false&#8221; firstline=&#8221;1&#8243; gutter=&#8221;true&#8221; htmlscript=&#8221;false&#8221; light=&#8221;false&#8221; padlinenumbers=&#8221;false&#8221; smarttabs=&#8221;true&#8221; tabsize=&#8221;4&#8243; toolbar=&#8221;false&#8221;]-\u00a0(void)\u00a0setDigit:(NSInteger)digit forView:(UIView\u00a0*)view<br \/>\n{<br \/>\n  view.layer.contentsRect\u00a0=\u00a0CGRectMake(digit\u00a0*\u00a00.1,\u00a00,\u00a00.1,\u00a01.0);<br \/>\n}[\/code]<\/p>\n<h6>Set current time:<\/h6>\n<p>[code lang=&#8221;java&#8221; autolinks=&#8221;false&#8221; collapse=&#8221;false&#8221; firstline=&#8221;1&#8243; gutter=&#8221;true&#8221; htmlscript=&#8221;false&#8221; light=&#8221;false&#8221; padlinenumbers=&#8221;false&#8221; smarttabs=&#8221;true&#8221; tabsize=&#8221;4&#8243; toolbar=&#8221;false&#8221;]-\u00a0(void)\u00a0tick<br \/>\n{<br \/>\n  \/\/ create a calendar with current time (hh:mm:ss)<br \/>\n  NSCalendar\u00a0*calendar\u00a0=\u00a0[[NSCalendar\u00a0alloc]\u00a0initWithCalendarIdentifier:\u00a0NSGregorianCalendar];<br \/>\n  NSUInteger units\u00a0=\u00a0NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;<br \/>\n  NSDateComponents\u00a0*components\u00a0=\u00a0[calendar components:units fromDate:[NSDate\u00a0date]];<\/p>\n<p>  \/\/ load digit from sprite<br \/>\n  [self setDigit:components.hour\u00a0\/\u00a010\u00a0forView:_digitViews[0]];<br \/>\n  [self setDigit:components.hour\u00a0%\u00a010\u00a0forView:_digitViews[1]];<\/p>\n<p>  [self setDigit:components.minute\u00a0\/\u00a010\u00a0forView:_digitViews[2]];<br \/>\n  [self setDigit:components.minute\u00a0%\u00a010\u00a0forView:_digitViews[3]];<\/p>\n<p>  [self setDigit:components.second\u00a0\/\u00a010\u00a0forView:_digitViews[4]];<br \/>\n  [self setDigit:components.second\u00a0%\u00a010\u00a0forView:_digitViews[5]];<br \/>\n}[\/code]<\/p>\n<p>Build and run!<\/p>\n<p><a href=\"https:\/\/i0.wp.com\/www.albertopasca.it\/whiletrue\/wp-content\/uploads\/2013\/10\/Schermata-2013-10-22-alle-10.13.44.png\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2762\" src=\"https:\/\/i0.wp.com\/www.albertopasca.it\/whiletrue\/wp-content\/uploads\/2013\/10\/Schermata-2013-10-22-alle-10.13.44.png?resize=276%2C99\" alt=\"Schermata 2013-10-22 alle 10.13.44\" width=\"276\" height=\"99\" \/><\/a><\/p>\n<p>Ref:<br \/>\n\u2013\u00a0<a href=\"http:\/\/goo.gl\/1TFH2I\" target=\"_blank\" rel=\"noopener\">http:\/\/goo.gl\/1TFH2I<\/a><br \/>\n\u2013\u00a0<a href=\"http:\/\/www.albertopasca.it\/software\/developer\/milano\" target=\"_blank\" rel=\"noopener\">albertopasca.it<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Today, a simple snippet to learn how to use\u00a0IBOutletCollection\u00a0and\u00a0image spritesin your applications. IBOutletCollection\u00a0are introduced with\u00a0iOS4\u00a0as you can see on Apple iOS diff guide (\u00a0http:\/\/goo.gl\/C8NRZz\u00a0) and are a\u00a0collection of IBOutlets.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[1],"tags":[73,466,467,24],"class_list":["post-490","post","type-post","status-publish","format-standard","hentry","category-generic","tag-clock","tag-digital","tag-iboutletcollection","tag-sprite"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Objc \u2013 Digital clock using IBOutletCollection - while (true) {\u00a0}<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.albertopasca.it\/whiletrue\/objc-digital-clock-using-iboutletcollection\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Objc \u2013 Digital clock using IBOutletCollection - while (true) {\u00a0}\" \/>\n<meta property=\"og:description\" content=\"Today, a simple snippet to learn how to use\u00a0IBOutletCollection\u00a0and\u00a0image spritesin your applications. 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