{"id":82,"date":"2012-07-04T11:05:50","date_gmt":"2012-07-04T11:05:50","guid":{"rendered":"https:\/\/www.securekloud.com\/blog\/?p=82"},"modified":"2023-03-24T10:33:27","modified_gmt":"2023-03-24T10:33:27","slug":"uigesturerecognizer-for-ios","status":"publish","type":"post","link":"https:\/\/www.securekloud.com\/blog\/uigesturerecognizer-for-ios\/","title":{"rendered":"UIGestureRecognizer for IOS: How Does it Work?"},"content":{"rendered":"

Introductions:<\/strong><\/p>\n

UIGestureRecognizer is an abstract base class for concrete gesture-recognizer classes.<\/p>\n

If you need to detect gestures in your app, such as taps, pinches, pans, or rotations, it\u2019s extremely easy with the built-in UIGestureRecognizer classes.<\/p>\n

In the old days before UIGestureRecognizers, if you wanted to detect a gesture such as a swipe, you\u2019d have to register for notifications on every touch within a UIView \u2013 such as touchesBegan, touchesMoves, and touchesEnded.<\/p>\n

The concrete subclasses of UIGestureRecognizer are the following:<\/p>\n


\nUITapGestureRecognizer
\nUIPinchGestureRecognizer
\nUIRotationGestureRecognizer
\nUISwipeGestureRecognizer
\nUIPanGestureRecognizer
\nUILongPressGestunizer
\n<\/code>
\nA gesture recognizer has one or more target-action pairs associated with it. If there are multiple target-action pairs, they are discrete, and not cumulative. Recognition of a gesture results in the dispatch of an action message to a target for each of those pairs. The action methods invoked must conform to one of the following signatures:<\/p>\n


\n-(void)handleGesture;
\n-(void)handleGesture:(UIGestureRecognizer *)gestureRecognize;
\n<\/code><\/p>\n

Solution :<\/b><\/p>\n

Step 1 :<\/b> Create a new file of class ViewController and a UIView<\/p>\n

Step 2 :<\/b> in viewDidLoad implement concrete subclasses of UIGestureRecognizer<\/p>\n

eg :<\/p>\n


\nUITapGestureRecognizer
\n-(void) viewDidLoad {
\nUITapGestureRecognizer * recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap:)];
\nrecognizer.delegate = self;
\n[view addGestureRecognizer:recognizer];
\n}
\n<\/code><\/p>\n

Step 3 :<\/b> Implement the gesture handle<\/p>\n


\n- (void)handleTap:(UITapGestureRecognizer *)recognizer {
\nNSLog (@\u201dyour implementation here\u201d);
\n}
\n<\/code><\/p>\n

Conclusion<\/strong> :<\/p>\n

UIGestureRecognizer classes! These provide a default implementation of detecting common gestures such as taps, pinches, rotations, swipes, pans, and long presses. By using them, not only it reduce you code length, but it easy too.<\/p>\n","protected":false},"excerpt":{"rendered":"

Introductions: UIGestureRecognizer is an abstract base class for concrete gesture-recognizer classes. If you need to detect gestures in your app, such as taps, pinches, pans, or rotations, it\u2019s extremely easy with the built-in UIGestureRecognizer classes. In the old days before UIGestureRecognizers, if you wanted to detect a gesture such as a swipe, you\u2019d have to […]<\/p>\n","protected":false},"author":5,"featured_media":83,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"content-type":"","footnotes":""},"categories":[330],"tags":[],"class_list":["post-82","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application-development"],"yoast_head":"\nUIGestureRecognizer for IOS: How Does it Work? | SecureKloud<\/title>\n<meta name=\"description\" content=\"Get to know what UIGestureRecognizer is all about, its implementation, and how it provides a default implementation of detecting common gestures.\" \/>\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.securekloud.com\/blog\/uigesturerecognizer-for-ios\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"UIGestureRecognizer for IOS: How Does it Work? | SecureKloud\" \/>\n<meta property=\"og:description\" content=\"Get to know what UIGestureRecognizer is all about, its implementation, and how it provides a default implementation of detecting common gestures.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.securekloud.com\/blog\/uigesturerecognizer-for-ios\/\" \/>\n<meta property=\"og:site_name\" content=\"SecureKloud\" \/>\n<meta property=\"article:published_time\" content=\"2012-07-04T11:05:50+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-03-24T10:33:27+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.securekloud.com\/blog\/wp-content\/uploads\/2021\/04\/UI-Gesture-Recognizer.png\" \/>\n\t<meta property=\"og:image:width\" content=\"800\" \/>\n\t<meta property=\"og:image:height\" content=\"400\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Joe Arputhan\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Joe Arputhan\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.securekloud.com\/blog\/uigesturerecognizer-for-ios\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.securekloud.com\/blog\/uigesturerecognizer-for-ios\/\"},\"author\":{\"name\":\"Joe Arputhan\",\"@id\":\"https:\/\/www.securekloud.com\/blog\/#\/schema\/person\/de22247532aa8172abce3df9a1b12708\"},\"headline\":\"UIGestureRecognizer for IOS: How Does it Work?\",\"datePublished\":\"2012-07-04T11:05:50+00:00\",\"dateModified\":\"2023-03-24T10:33:27+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.securekloud.com\/blog\/uigesturerecognizer-for-ios\/\"},\"wordCount\":205,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.securekloud.com\/blog\/#organization\"},\"articleSection\":[\"Application Development\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.securekloud.com\/blog\/uigesturerecognizer-for-ios\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.securekloud.com\/blog\/uigesturerecognizer-for-ios\/\",\"url\":\"https:\/\/www.securekloud.com\/blog\/uigesturerecognizer-for-ios\/\",\"name\":\"UIGestureRecognizer for IOS: How Does it Work? 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