{"id":423,"date":"2014-01-31T20:00:12","date_gmt":"2014-01-31T19:00:12","guid":{"rendered":"http:\/\/www.albertopasca.it\/whiletrue\/?p=423"},"modified":"2022-06-03T01:49:04","modified_gmt":"2022-06-02T23:49:04","slug":"objc-draw-matrix-on-uiview","status":"publish","type":"post","link":"https:\/\/www.albertopasca.it\/whiletrue\/objc-draw-matrix-on-uiview\/","title":{"rendered":"[Objc] Draw matrix on UIView"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">A simple memo to draw a&nbsp;<em>matrix<\/em>&nbsp;on a view, based on view size.<\/p>\n\n\n\n<!--more-->\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter\"><a href=\"https:\/\/i0.wp.com\/www.albertopasca.it\/whiletrue\/wp-content\/uploads\/2014\/01\/Schermata-2014-01-31-alle-09.59.49.png\" target=\"_blank\" rel=\"noopener\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/www.albertopasca.it\/whiletrue\/wp-content\/uploads\/2014\/01\/Schermata-2014-01-31-alle-09.59.49.png\" alt=\"objectivec draw matrix\" class=\"wp-image-2909\"\/><\/a><\/figure>\n<\/div>\n\n\n<p class=\"wp-block-paragraph\">You need only to subclass a view and add\u00a0<em><strong>QuartzCore<\/strong> framework<\/em>.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"objectivec\" class=\"language-objectivec\">-(void)drawRect:(CGRect)rect\n{\n\tCGContextRef context = UIGraphicsGetCurrentContext();\n\n\t\/\/ set line Color\n\tUIColor *lineColor = [UIColor colorWithRed:1.0 green:0.0 blue:0.0 alpha:1.0];\n\tCGContextSetStrokeColorWithColor(context, lineColor.CGColor);\n\tCGContextSetLineWidth(context, 1.0);\n\n\tCGFloat gridSize = 60.0f;\n\n\t\/\/ draw horizontal lines\n\tCGFloat linePosition = 0.0;\n\twhile(linePosition &amp;amp;lt; rect.size.height)\n\t{\n\t\tCGContextBeginPath(context);\n\t\tCGContextMoveToPoint(context, 0, linePosition);\n\t\tCGContextAddLineToPoint(context, rect.size.width, linePosition);\n\t\tCGContextStrokePath(context);\n\t\tlinePosition += gridSize;\n\t}\n\n\t\/\/ draw vertical lines\n\tlinePosition = 0.0f;\n\twhile (linePosition &amp;amp;lt; rect.size.width)\n\t{\n\t\tCGContextBeginPath(context);\n\t\tCGContextMoveToPoint(context, linePosition, 0);\n\t\tCGContextAddLineToPoint(context, linePosition, rect.size.height);\n\t\tCGContextStrokePath(context);\n\t\tlinePosition += gridSize;\n\t}\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">ref:&nbsp;<a title=\"software developer :: alberto pasca\" href=\"http:\/\/www.albertopasca.it\/software_developer\/\" target=\"_blank\" rel=\"noopener\">albertopasca.it<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A simple memo to draw a&nbsp;matrix&nbsp;on a view, based on view size.<\/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":[253,72,167,252],"class_list":["post-423","post","type-post","status-publish","format-standard","hentry","category-generic","tag-draw","tag-matrix","tag-objectivec","tag-uiview"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.7 - 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