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2014/10/15 ¤U¤È 10:07:37
iphone Programming Glossary: drawingRetrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage down. See the docs . Edit after reading code You also want to set the blend mode to replace before drawing the image since you want the image's alpha value not the one which was in the context's buffer before..
How to customize the callout bubble for MKAnnotationView? http://stackoverflow.com/questions/1565828/how-to-customize-the-callout-bubble-for-mkannotationview exactly what I want. Is there a way to dig into the map view to remove the callout bubble before drawing I'm at a loss. Any suggestions Am I missing something obvious iphone ios mkmapview mapkit mkannotationview..
http://stackoverflow.com/questions/158914/cropping-a-uiimage two different theories and I'm wondering if either is on base. Theory 1 I achieve the cropping by drawing into an offscreen image context of my target size. Since I want the center portion of the image I set.. there are portions of UIKit that are restricted to the main thread. I was assuming hoping that drawing to an offscreen view wasn't one of these. Am I wrong Oh how I miss NSImage's drawInRect fromRect operation..
Cocoa Graphing/Plotting Framework that Works on iPhoneOS [closed] http://stackoverflow.com/questions/263472/cocoa-graphing-plotting-framework-that-works-on-iphoneos iPhone app in development ala the Stocks app . I realize I could buckle down and do some Quartz drawing but I'm hoping that someone somewhere has a tip on a Cocoa graphing framework that works on iPhoneOS...
http://stackoverflow.com/questions/2711297/underline-text-in-uilabel help me on this I try to use UILabel textRectForBounds limitedToNumberOfLines this should be the drawing bounding rect for the text right Then I have to work on the aligment How can I get the start point of..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints Lean PDF Viewer for iPhone iPad iOs tips and hints There has been many Questions recently about drawing PDF's. Yes you can render PDF's very easily with a UIWebView but this cant give the performance and.. a real time render of new zoom levels. CATiledLayer Method Theres a significant Overhead time drawing a full PDF page to a CALayer individual tiles can be seen rendering even with a tileSize tweak CALayers.. each side of the page in focus so that the PDF image is ready to mask the layer before it starts drawing.Pages are destroyed again when they are 2 pages away from the focused page. Does anyone have any insights..
How to customize the background/border colors of a grouped table view cell? http://stackoverflow.com/questions/400965/how-to-customize-the-background-border-colors-of-a-grouped-table-view-cell that this is currently the only way. Update Here's the code for that custom bg view. There's a drawing bug that makes the rounded corners look a little funny but we moved to a different design and scrapped.. CGContextAddLineToPoint c rect.size.width 0.0f CGContextStrokePath c return no need to bother drawing rounded corners so we return At this point the clip rect is set to only draw the appropriate corners..
Gradients on UIView and UILabels On iPhone [duplicate] http://stackoverflow.com/questions/422066/gradients-on-uiview-and-uilabels-on-iphone on UIView and UILabels On iPhone duplicate Possible Duplicate Manually drawing a gradient in iPhone apps My application needs to display text in either a View or Label but the back..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file the CoreGraphics framework is tedious work in my honest opinion when it comes to programmatically drawing a PDF file. I would like to programmatically create a PDF using various objects from views throughout.. text Hello World CGContextShowTextAtPoint pdfContext 260 390 text strlen text End text We are done drawing to this page let's end it We could add as many pages as we wanted using CGContextBeginPage CGContextEndPage..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer subtract the visible path from and apply a shadow CGMutablePathRef path CGPathCreateMutable when drawing the shadow for a path whichs bounding box is not known pass CGPathGetPathBoundingBox visiblePath instead..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload self.size.width self.size.height self.CGImage break And now we just create a new UIImage from the drawing context CGImageRef cgimg CGBitmapContextCreateImage ctx UIImage img UIImage imageWithCGImage cgimg CGContextRelease..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space Texture Coordinates in Pixel Space I'm working on an iPhone app that uses OpenGL ES 2 for its drawing. I know that typically texture coordinates are defined in the 0 1 range but ideally I'd like to map..
http://stackoverflow.com/questions/72288/learning-opengl-es-1-x cruft display lists immediate mode things that are in OpenGL but are not directly related to just drawing triangles . Basically unlearn everything that has been declared deprecated in OpenGL 3.0. GL ES 1.x..
How do I draw a line on the iPhone? http://stackoverflow.com/questions/856354/how-do-i-draw-a-line-on-the-iphone to draw a line to the phone screen for the purpose of study using Quartz and UIKit. How do I start drawing iphone cocoa touch quartz graphics share improve this question The first step is to define a subclass..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage have their y axis pointing up while in UIKit it points down. See the docs . Edit after reading code You also want to set the blend mode to replace before drawing the image since you want the image's alpha value not the one which was in the context's buffer before CGContextSetBlendMode context kCGBlendModeCopy Edit after..
How to customize the callout bubble for MKAnnotationView? http://stackoverflow.com/questions/1565828/how-to-customize-the-callout-bubble-for-mkannotationview to catching touch events in the map view but they aren't exactly what I want. Is there a way to dig into the map view to remove the callout bubble before drawing I'm at a loss. Any suggestions Am I missing something obvious iphone ios mkmapview mapkit mkannotationview share improve this question There is an even easier..
http://stackoverflow.com/questions/158914/cropping-a-uiimage some crashes in this code and I'm a bit stumped. I've got two different theories and I'm wondering if either is on base. Theory 1 I achieve the cropping by drawing into an offscreen image context of my target size. Since I want the center portion of the image I set the CGRect argument passed to drawInRect to something that's.. Theory 2 I'm doing all of this in a background thread. I know there are portions of UIKit that are restricted to the main thread. I was assuming hoping that drawing to an offscreen view wasn't one of these. Am I wrong Oh how I miss NSImage's drawInRect fromRect operation fraction method. iphone objective c cocoa touch image..
Cocoa Graphing/Plotting Framework that Works on iPhoneOS [closed] http://stackoverflow.com/questions/263472/cocoa-graphing-plotting-framework-that-works-on-iphoneos iPhoneOS closed Looking at adding some data graphing to a new iPhone app in development ala the Stocks app . I realize I could buckle down and do some Quartz drawing but I'm hoping that someone somewhere has a tip on a Cocoa graphing framework that works on iPhoneOS. Any suggestions It would be a shame to re invent the wheel..
http://stackoverflow.com/questions/2711297/underline-text-in-uilabel out the length and start point forthe string. Can anybody help me on this I try to use UILabel textRectForBounds limitedToNumberOfLines this should be the drawing bounding rect for the text right Then I have to work on the aligment How can I get the start point of each line when it is center justified and right justfied I..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints and Lean PDF Viewer for iPhone iPad iOs tips and hints There has been many Questions recently about drawing PDF's. Yes you can render PDF's very easily with a UIWebView but this cant give the performance and functionality that you would expect from a good PDF viewer... UIImages from a PDFcontext limits prevents using it to create a real time render of new zoom levels. CATiledLayer Method Theres a significant Overhead time drawing a full PDF page to a CALayer individual tiles can be seen rendering even with a tileSize tweak CALayers cant be prepared ahead of time rendered off screen . Generally.. a second before a crisp version appears. Im rendering 2 pages each side of the page in focus so that the PDF image is ready to mask the layer before it starts drawing.Pages are destroyed again when they are 2 pages away from the focused page. Does anyone have any insights no matter how small or obvious to improve the performance..
How to customize the background/border colors of a grouped table view cell? http://stackoverflow.com/questions/400965/how-to-customize-the-background-border-colors-of-a-grouped-table-view-cell It's a real PITA but I've confirmed with Apple engineers that this is currently the only way. Update Here's the code for that custom bg view. There's a drawing bug that makes the rounded corners look a little funny but we moved to a different design and scrapped the custom backgrounds before I had a chance to fix it. Still.. CGContextAddLineToPoint c rect.size.width rect.size.height CGContextAddLineToPoint c rect.size.width 0.0f CGContextStrokePath c return no need to bother drawing rounded corners so we return At this point the clip rect is set to only draw the appropriate corners so we fill and stroke a rounded rect taking the entire rect..
Gradients on UIView and UILabels On iPhone [duplicate] http://stackoverflow.com/questions/422066/gradients-on-uiview-and-uilabels-on-iphone on UIView and UILabels On iPhone duplicate Possible Duplicate Manually drawing a gradient in iPhone apps My application needs to display text in either a View or Label but the back ground must be a gradient as opposed to a true color. Using..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file SDK Programmatically generate a PDF file Using the CoreGraphics framework is tedious work in my honest opinion when it comes to programmatically drawing a PDF file. I would like to programmatically create a PDF using various objects from views throughout my app. I am interested to know if there are any good PDF.. CGContextSetRGBFillColor pdfContext 0 0 0 1 const char text Hello World CGContextShowTextAtPoint pdfContext 260 390 text strlen text End text We are done drawing to this page let's end it We could add as many pages as we wanted using CGContextBeginPage CGContextEndPage CGContextEndPage pdfContext We are done with our context..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer context Now create a larger rectangle which we're going to subtract the visible path from and apply a shadow CGMutablePathRef path CGPathCreateMutable when drawing the shadow for a path whichs bounding box is not known pass CGPathGetPathBoundingBox visiblePath instead of bounds in the following line 42 cuould just be any offset..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload break default CGContextDrawImage ctx CGRectMake 0 0 self.size.width self.size.height self.CGImage break And now we just create a new UIImage from the drawing context CGImageRef cgimg CGBitmapContextCreateImage ctx UIImage img UIImage imageWithCGImage cgimg CGContextRelease ctx CGImageRelease cgimg return img @end share..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space Texture Coordinates in Pixel Space I'm working on an iPhone app that uses OpenGL ES 2 for its drawing. I know that typically texture coordinates are defined in the 0 1 range but ideally I'd like to map them from 0 1023 the size of my TextureAtlas for readability's..
http://stackoverflow.com/questions/72288/learning-opengl-es-1-x via other means and forget about all things that are old cruft display lists immediate mode things that are in OpenGL but are not directly related to just drawing triangles . Basically unlearn everything that has been declared deprecated in OpenGL 3.0. GL ES 1.x is for pretty simple devices. What you have is a way to draw..
How do I draw a line on the iPhone? http://stackoverflow.com/questions/856354/how-do-i-draw-a-line-on-the-iphone I am a beginner at iPhone programming and would like to draw a line to the phone screen for the purpose of study using Quartz and UIKit. How do I start drawing iphone cocoa touch quartz graphics share improve this question The first step is to define a subclass of UIView to create a space to draw in. If you're starting..
Retrieving a pixel alpha value for a UIImage http://stackoverflow.com/questions/1042830/retrieving-a-pixel-alpha-value-for-a-uiimage in UIKit it points down. See the docs . Edit after reading code You also want to set the blend mode to replace before drawing the image since you want the image's alpha value not the one which was in the context's buffer before CGContextSetBlendMode..
How to customize the callout bubble for MKAnnotationView? http://stackoverflow.com/questions/1565828/how-to-customize-the-callout-bubble-for-mkannotationview view but they aren't exactly what I want. Is there a way to dig into the map view to remove the callout bubble before drawing I'm at a loss. Any suggestions Am I missing something obvious iphone ios mkmapview mapkit mkannotationview share improve..
http://stackoverflow.com/questions/158914/cropping-a-uiimage stumped. I've got two different theories and I'm wondering if either is on base. Theory 1 I achieve the cropping by drawing into an offscreen image context of my target size. Since I want the center portion of the image I set the CGRect argument.. thread. I know there are portions of UIKit that are restricted to the main thread. I was assuming hoping that drawing to an offscreen view wasn't one of these. Am I wrong Oh how I miss NSImage's drawInRect fromRect operation fraction method...
Cocoa Graphing/Plotting Framework that Works on iPhoneOS [closed] http://stackoverflow.com/questions/263472/cocoa-graphing-plotting-framework-that-works-on-iphoneos data graphing to a new iPhone app in development ala the Stocks app . I realize I could buckle down and do some Quartz drawing but I'm hoping that someone somewhere has a tip on a Cocoa graphing framework that works on iPhoneOS. Any suggestions It..
http://stackoverflow.com/questions/2711297/underline-text-in-uilabel string. Can anybody help me on this I try to use UILabel textRectForBounds limitedToNumberOfLines this should be the drawing bounding rect for the text right Then I have to work on the aligment How can I get the start point of each line when it..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints and Lean PDF Viewer for iPhone iPad iOs tips and hints There has been many Questions recently about drawing PDF's. Yes you can render PDF's very easily with a UIWebView but this cant give the performance and functionality that you.. using it to create a real time render of new zoom levels. CATiledLayer Method Theres a significant Overhead time drawing a full PDF page to a CALayer individual tiles can be seen rendering even with a tileSize tweak CALayers cant be prepared.. Im rendering 2 pages each side of the page in focus so that the PDF image is ready to mask the layer before it starts drawing.Pages are destroyed again when they are 2 pages away from the focused page. Does anyone have any insights no matter how..
How to customize the background/border colors of a grouped table view cell? http://stackoverflow.com/questions/400965/how-to-customize-the-background-border-colors-of-a-grouped-table-view-cell with Apple engineers that this is currently the only way. Update Here's the code for that custom bg view. There's a drawing bug that makes the rounded corners look a little funny but we moved to a different design and scrapped the custom backgrounds.. rect.size.height CGContextAddLineToPoint c rect.size.width 0.0f CGContextStrokePath c return no need to bother drawing rounded corners so we return At this point the clip rect is set to only draw the appropriate corners so we fill and stroke..
Gradients on UIView and UILabels On iPhone [duplicate] http://stackoverflow.com/questions/422066/gradients-on-uiview-and-uilabels-on-iphone on UIView and UILabels On iPhone duplicate Possible Duplicate Manually drawing a gradient in iPhone apps My application needs to display text in either a View or Label but the back ground must be a gradient..
iOS SDK - Programmatically generate a PDF file http://stackoverflow.com/questions/4362734/ios-sdk-programmatically-generate-a-pdf-file a PDF file Using the CoreGraphics framework is tedious work in my honest opinion when it comes to programmatically drawing a PDF file. I would like to programmatically create a PDF using various objects from views throughout my app. I am interested.. 0 0 0 1 const char text Hello World CGContextShowTextAtPoint pdfContext 260 390 text strlen text End text We are done drawing to this page let's end it We could add as many pages as we wanted using CGContextBeginPage CGContextEndPage CGContextEndPage..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer which we're going to subtract the visible path from and apply a shadow CGMutablePathRef path CGPathCreateMutable when drawing the shadow for a path whichs bounding box is not known pass CGPathGetPathBoundingBox visiblePath instead of bounds in the..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload ctx CGRectMake 0 0 self.size.width self.size.height self.CGImage break And now we just create a new UIImage from the drawing context CGImageRef cgimg CGBitmapContextCreateImage ctx UIImage img UIImage imageWithCGImage cgimg CGContextRelease ctx..
OpenGL Texture Coordinates in Pixel Space http://stackoverflow.com/questions/5879403/opengl-texture-coordinates-in-pixel-space Texture Coordinates in Pixel Space I'm working on an iPhone app that uses OpenGL ES 2 for its drawing. I know that typically texture coordinates are defined in the 0 1 range but ideally I'd like to map them from 0 1023 the..
Drawing rotated text with NSString drawInRect http://stackoverflow.com/questions/10289898/drawing-rotated-text-with-nsstring-drawinrect rotated text with NSString drawInRect I found this answer on how to draw rotated text with NSString drawInRect but I'm..
Google Map Route Draw on IPhone http://stackoverflow.com/questions/1085749/google-map-route-draw-on-iphone question Maybe you want to take a look at Craig Spitzkoff's MapLinesAndAnnotations sample that he recently wrote Drawing polyines or routes on a MKMapView Using Map Kit on the iPhone Using MKAnnotation MKPinAnnotationView and creating a custom..
How can i create a PDF file programmatically in an iphone application? http://stackoverflow.com/questions/1360912/how-can-i-create-a-pdf-file-programmatically-in-an-iphone-application UIButton it generate a PDF file for that action. Any Suggestion. iphone share improve this question See pg 35 of Drawing with Quartz to see how to create a PDF Graphics Context. Some notes iPhoneOSNote If you want to create a PDF graphics context..
http://stackoverflow.com/questions/14659563/to-drawrect-or-not-to-drawrect-when-should-one-use-drawrect-core-graphics-vs-su In fact it's a suggested method in Apple's Table Sample Code has been suggested in several WWDC videos Practical Drawing for iOS Developers and many iOS programming books . There are even awesome looking tools to design graphics and generate..
Drawing incrementally in a UIView (iPhone) http://stackoverflow.com/questions/1798414/drawing-incrementally-in-a-uiview-iphone incrementally in a UIView iPhone As far as I have understood so far every time I draw something in the drawRect of a UIView.. You also need to make sure that the graphics content is not cleared before drawing by setting view.clearsContextBeforeDrawing YES Of course all this also means that your drawRect implementation needs to respect the rect parameter which should then..
iPhone - How do you make a resizable rectangle for cropping images? http://stackoverflow.com/questions/1971542/iphone-how-do-you-make-a-resizable-rectangle-for-cropping-images UIView. I implement the touches methods to deal with dragging it around and also drawRect void drawRect CGRect rect Drawing code if self.image nil return CGPoint offset scrollView.contentOffset clipRect CGRectOffset self.frame offset.x offset.y..
Annotate PDF within iPhone SDK http://stackoverflow.com/questions/2313008/annotate-pdf-within-iphone-sdk annotation. To vary the annotations just add in more drawing code in place of the drawInRect withFont method. See the Drawing and Printing Guide for iOS for more on how to do that. void exampleAnnotation NSURL url NSURL fileURLWithPath self getPDFFileName..
How to change an UILabel/UIFont's letter spacing? http://stackoverflow.com/questions/2544905/how-to-change-an-uilabel-uifonts-letter-spacing context Arial BoldMT 60 kCGEncodingMacRoman CGContextSetCharacterSpacing context 10 CGContextSetTextDrawingMode context kCGTextFill CGContextSetRGBFillColor context 221 255.0 221 255.0 221 255.0 221 255.0 CGAffineTransform xform.. it nice to be auto centered Enjoy @interface RALabel UILabel @end @implementation RALabel void drawRect CGRect rect Drawing code CGContextRef context UIGraphicsGetCurrentContext CGContextSelectFont context self.font.fontName cStringUsingEncoding..
Drawing a route in mapkit in iphone sdk http://stackoverflow.com/questions/2834523/drawing-a-route-in-mapkit-in-iphone-sdk a route in mapkit in iphone sdk I want to draw a route between 2 locations on the map. Something as a tour guide. When..
Drawing formulas with Quartz 2d http://stackoverflow.com/questions/2907045/drawing-formulas-with-quartz-2d formulas with Quartz 2d In my iPhone App I'd like to draw a few formulas. How can I manage that with quartz 2d Is there..
http://stackoverflow.com/questions/2956967/drawing-path-by-bezier-curves path by Bezier curves I have a task draw smooth curve input set of points they added in realtime current solution I use..
Fast and Lean PDF Viewer for iPhone / iPad / iOs - tips and hints? http://stackoverflow.com/questions/3889634/fast-and-lean-pdf-viewer-for-iphone-ipad-ios-tips-and-hints page. Does anyone have any insights no matter how small or obvious to improve the performance memory handling of Drawing PDF's or any other issues discussed here EDIT Some Tips Credit Luke Mcneice VdesmedT Matt Gallagher Johann Save any media.. @synchronized issue CGPDFPageRef pdfPage CGPDFDocumentGetPage issue.pdfDoc pageIndex 1 pdfToPageTransform CGPDFPageGetDrawingTransform pdfPage kCGPDFMediaBox layer.bounds 0 true CGContextConcatCTM context pdfToPageTransform CGContextDrawPDFPage context..
How to customize the background/border colors of a grouped table view cell? http://stackoverflow.com/questions/400965/how-to-customize-the-background-border-colors-of-a-grouped-table-view-cell CGRect frame if self super initWithFrame frame Initialization code return self void drawRect CGRect rect Drawing code CGContextRef c UIGraphicsGetCurrentContext CGContextSetFillColorWithColor c fillColor CGColor CGContextSetStrokeColorWithColor..
How do I change the background of a UINavigationBar? http://stackoverflow.com/questions/4319112/how-do-i-change-the-background-of-a-uinavigationbar to provide your own UINavigationBar subclass and override the drawRect method for example void drawRect CGRect rect Drawing code UIImage img UIImage imageNamed @ background image.png img drawInRect CGRectMake 0 0 self.frame.size.width self.frame.size.height..
Drawing bezier curves with my finger in iOS? http://stackoverflow.com/questions/4672646/drawing-bezier-curves-with-my-finger-in-ios bezier curves with my finger in iOS Hey I'm trying to figure out how to generate bezier curves in iOS based on user input...
Drawing waveform with AVAssetReader http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader waveform with AVAssetReader I reading song from iPod library using assetUrl in code it named audioUrl I can play it many..
Recreate recipient bubble behaviour in Mail.app / Three20 http://stackoverflow.com/questions/5247072/recreate-recipient-bubble-behaviour-in-mail-app-three20 UIColor clearColor set CGRect myRect CGRectMake 0.0f 0.0f SIDELENGTH SIDELENGTH UIRectFill myRect self.color set Drawing code CGSize textSize self.text sizeWithFont UIFont boldSystemFontOfSize UIFont systemFontSize double capDiameter textSize.height..
How do I use a UIWebView in a Table Cell? http://stackoverflow.com/questions/646809/how-do-i-use-a-uiwebview-in-a-table-cell and add subviews to it's contentView. This has been covered extensively by Matt Gallagher's Easy Custom UITableView Drawing . Another method described was to use Three20 which can give you styled text as well. What you are attempting currently..
iPhone Core Animation - Drawing a Circle http://stackoverflow.com/questions/7991086/iphone-core-animation-drawing-a-circle Core Animation Drawing a Circle I wish to create an animation. The best way I can explain this is if you can imagine drawing a circle. It starts..
Drawing Smooth Curves - Methods Needed http://stackoverflow.com/questions/8702696/drawing-smooth-curves-methods-needed Smooth Curves Methods Needed Like everyone before has asked how do you smooth a set of points in an iOS drawing app WHILE..
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