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2014/10/15 ¤U¤È 10:07:35
iphone Programming Glossary: drawiOS 6 apps - how to deal with iPhone 5 screen size? [duplicate] http://stackoverflow.com/questions/12396545/ios-6-apps-how-to-deal-with-iphone-5-screen-size I personally don't think Apple will require you to check the screen size every time you have to draw something like many answers say. Does that happen with the iPad iphone ios iphone 5 share improve..
How to customize the callout bubble for MKAnnotationView? http://stackoverflow.com/questions/1565828/how-to-customize-the-callout-bubble-for-mkannotationview else. My idea was to override selectAnnotation deselectAnnotation in my MKMapViewDelegate and then draw my own custom view by making a call to my custom annotation view. This works but only when canShowCallout.. NOT called if I have this set to NO which is what I want so that the default callout bubble is not drawn . So I have no way of knowing if the user touched on my point on the map selected it or touched a point.. 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.. my target size. Since I want the center portion of the image I set the CGRect argument passed to drawInRect to something that's larger than the bounds of my image context. I was hoping this was Kosher but.. than the bounds of my image context. I was hoping this was Kosher but am I instead attempting to draw over other memory that I shouldn't be touching Theory 2 I'm doing all of this in a background thread...
http://stackoverflow.com/questions/2711297/underline-text-in-uilabel My thoughts was to figure out the start point and length of each string in each line. And draw a line under it accordingly. I meet problems at how to figure out the length and start point forthe.. 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.. text uilabel underline share improve this question You may subclass from UILabel and override drawRect method void drawRect CGRect rect CGContextRef ctx UIGraphicsGetCurrentContext CGContextSetRGBStrokeColor..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie
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.. cant give the performance and functionality that you would expect from a good PDF viewer. You can draw a PDF page to a CALayer or to a UIImage . Apple even have sample code to show how draw a large PDF in.. You can draw a PDF page to a CALayer or to a UIImage . Apple even have sample code to show how draw a large PDF in a Zoomable UIScrollview But the same issues keep cropping up. UIImage Method PDF's in..
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 had to do it You need to set the UITableViewCell's backgroundView property to a custom UIView that draws the border and background itself in the appropriate colors. This view needs to be able to draw the.. draws the border and background itself in the appropriate colors. This view needs to be able to draw the borders in 4 different modes rounded on the top for the first cell in a section rounded on the bottom.. 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..
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.. CGRect pageRect const char filename This code block sets up our PDF Context so that we can draw to it CGContextRef pdfContext CFStringRef path CFURLRef url CFMutableDictionaryRef myDictionary NULL.. our mess CFRelease myDictionary CFRelease url Done creating our PDF Context now it's time to draw to it Starts our first page CGContextBeginPage pdfContext pageRect Draws a black rectangle around the..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer inner shadow effect to it but I am not quite sure how to do this. I suppose I would be required to draw in drawRect however this would add the layer on top of other UIView objects since it's supposed to be.. effect to it but I am not quite sure how to do this. I suppose I would be required to draw in drawRect however this would add the layer on top of other UIView objects since it's supposed to be a bar.. iphone core graphics calayer share improve this question For anyone else wondering how to draw an inner shadow using Core Graphics as per Costique suggestion then this is how on iOS adjust as needed..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload case UIImageOrientationDown case UIImageOrientationLeft case UIImageOrientationRight break Now we draw the underlying CGImage into a new context applying the transform calculated above. CGContextRef ctx.. 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..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop hand Every code example I have found so far seems to smash the image be upside down look like crap draw out of bounds or otherwise just not work correctly. Thank you SO much for your help. iphone ios image.. thumbnailRect.size.width scaledWidth thumbnailRect.size.height scaledHeight sourceImage drawInRect thumbnailRect newImage UIGraphicsGetImageFromCurrentImageContext if newImage nil NSLog @ could..
How do I draw a line on the iPhone? http://stackoverflow.com/questions/856354/how-do-i-draw-a-line-on-the-iphone 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.. 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 .. 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..
iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate] http://stackoverflow.com/questions/12396545/ios-6-apps-how-to-deal-with-iphone-5-screen-size will we have to design two storyboards just like for the iPad I personally don't think Apple will require you to check the screen size every time you have to draw something like many answers say. Does that happen with the iPad iphone ios iphone 5 share improve this question All apps will continue to work in the vertically..
How to customize the callout bubble for MKAnnotationView? http://stackoverflow.com/questions/1565828/how-to-customize-the-callout-bubble-for-mkannotationview for the callout bubble or to give it zero size or anything else. My idea was to override selectAnnotation deselectAnnotation in my MKMapViewDelegate and then draw my own custom view by making a call to my custom annotation view. This works but only when canShowCallout is set to YES in my custom annotation view class. These.. YES in my custom annotation view class. These methods are NOT called if I have this set to NO which is what I want so that the default callout bubble is not drawn . So I have no way of knowing if the user touched on my point on the map selected it or touched a point that is not part of my annotation views delected it without.. 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..
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.. 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 larger than the bounds of my image context. I was hoping this was Kosher but am I instead attempting to draw over other memory that I.. argument passed to drawInRect to something that's larger than the bounds of my image context. I was hoping this was Kosher but am I instead attempting to draw over other memory that I shouldn't be touching Theory 2 I'm doing all of this in a background thread. I know there are portions of UIKit that are restricted to..
http://stackoverflow.com/questions/2711297/underline-text-in-uilabel but it is obviously too heave a class for just text rendering. My thoughts was to figure out the start point and length of each string in each line. And draw a line under it accordingly. I meet problems at how to figure out the length and start point forthe string. Can anybody help me on this I try to use UILabel textRectForBounds.. 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.. right justfied I am new here so thank in advance. iphone text uilabel underline share improve this question You may subclass from UILabel and override drawRect method void drawRect CGRect rect CGContextRef ctx UIGraphicsGetCurrentContext CGContextSetRGBStrokeColor ctx 207.0f 255.0f 91.0f 255.0f 44.0f 255.0f 1.0f RGBA..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie
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... 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. You can draw a PDF page to a CALayer or to a UIImage . Apple even have sample code to show how draw a large PDF in a Zoomable UIScrollview But the same issues keep cropping.. and functionality that you would expect from a good PDF viewer. You can draw a PDF page to a CALayer or to a UIImage . Apple even have sample code to show how draw a large PDF in a Zoomable UIScrollview But the same issues keep cropping up. UIImage Method PDF's in a UIImage don't optically scale as well as a Layer approach...
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 than it really should be. Here's how I did this when I had to do it You need to set the UITableViewCell's backgroundView property to a custom UIView that draws the border and background itself in the appropriate colors. This view needs to be able to draw the borders in 4 different modes rounded on the top for the first.. backgroundView property to a custom UIView that draws the border and background itself in the appropriate colors. This view needs to be able to draw the borders in 4 different modes rounded on the top for the first cell in a section rounded on the bottom for the last cell in a section no rounded corners for.. 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...
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.. where lines and other objects will be placed. void CreatePDFFile CGRect pageRect const char filename This code block sets up our PDF Context so that we can draw to it CGContextRef pdfContext CFStringRef path CFURLRef url CFMutableDictionaryRef myDictionary NULL Create a CFString from the filename we provide to this method.. CGPDFContextCreateWithURL url pageRect myDictionary Cleanup our mess CFRelease myDictionary CFRelease url Done creating our PDF Context now it's time to draw to it Starts our first page CGContextBeginPage pdfContext pageRect Draws a black rectangle around the page inset by 50 on all sides CGContextStrokeRect pdfContext..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer insertSublayer gradient atIndex 0 I'd like to add an inner shadow effect to it but I am not quite sure how to do this. I suppose I would be required to draw in drawRect however this would add the layer on top of other UIView objects since it's supposed to be a bar behind some buttons so I am at a loss as to what to.. gradient atIndex 0 I'd like to add an inner shadow effect to it but I am not quite sure how to do this. I suppose I would be required to draw in drawRect however this would add the layer on top of other UIView objects since it's supposed to be a bar behind some buttons so I am at a loss as to what to do I could.. achieve the inner shadow effect like this Help appreciated... iphone core graphics calayer share improve this question For anyone else wondering how to draw an inner shadow using Core Graphics as per Costique suggestion then this is how on iOS adjust as needed In your drawRect method... CGRect bounds self bounds CGContextRef..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload transform 1 1 break case UIImageOrientationUp case UIImageOrientationDown case UIImageOrientationLeft case UIImageOrientationRight break Now we draw the underlying CGImage into a new context applying the transform calculated above. CGContextRef ctx CGBitmapContextCreate NULL self.size.width self.size.height.. 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..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop to achieve. Would someone please be kind enough to hold my hand Every code example I have found so far seems to smash the image be upside down look like crap draw out of bounds or otherwise just not work correctly. Thank you SO much for your help. iphone ios image processing core graphics share improve this question .. CGRect thumbnailRect CGRectZero thumbnailRect.origin thumbnailPoint thumbnailRect.size.width scaledWidth thumbnailRect.size.height scaledHeight sourceImage drawInRect thumbnailRect newImage UIGraphicsGetImageFromCurrentImageContext if newImage nil NSLog @ could not scale image pop the context to get back to the default..
How do I draw a line on the iPhone? http://stackoverflow.com/questions/856354/how-do-i-draw-a-line-on-the-iphone 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 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.. 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..
iOS 6 apps - how to deal with iPhone 5 screen size? [duplicate] http://stackoverflow.com/questions/12396545/ios-6-apps-how-to-deal-with-iphone-5-screen-size just like for the iPad I personally don't think Apple will require you to check the screen size every time you have to draw something like many answers say. Does that happen with the iPad iphone ios iphone 5 share improve this question All..
How to customize the callout bubble for MKAnnotationView? http://stackoverflow.com/questions/1565828/how-to-customize-the-callout-bubble-for-mkannotationview size or anything else. My idea was to override selectAnnotation deselectAnnotation in my MKMapViewDelegate and then draw my own custom view by making a call to my custom annotation view. This works but only when canShowCallout is set to YES.. These methods are NOT called if I have this set to NO which is what I want so that the default callout bubble is not drawn . So I have no way of knowing if the user touched on my point on the map selected it or touched a point that is not part.. 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.. 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 larger than the bounds of my image context. I was hoping this was Kosher but am I instead attempting.. that's larger than the bounds of my image context. I was hoping this was Kosher but am I instead attempting to draw over other memory that I shouldn't be touching Theory 2 I'm doing all of this in a background thread. I know there are portions..
http://stackoverflow.com/questions/2711297/underline-text-in-uilabel for just text rendering. My thoughts was to figure out the start point and length of each string in each line. And draw a line under it accordingly. I meet problems at how to figure out the length and start point forthe string. Can anybody.. 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.. in advance. iphone text uilabel underline share improve this question You may subclass from UILabel and override drawRect method void drawRect CGRect rect CGContextRef ctx UIGraphicsGetCurrentContext CGContextSetRGBStrokeColor ctx 207.0f..
How do I export UIImage array as a movie? http://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie
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.. a UIWebView but this cant give the performance and functionality that you would expect from a good PDF viewer. You can draw a PDF page to a CALayer or to a UIImage . Apple even have sample code to show how draw a large PDF in a Zoomable UIScrollview.. from a good PDF viewer. You can draw a PDF page to a CALayer or to a UIImage . Apple even have sample code to show how draw a large PDF in a Zoomable UIScrollview But the same issues keep cropping up. UIImage Method PDF's in a UIImage don't optically..
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 I did this when I had to do it You need to set the UITableViewCell's backgroundView property to a custom UIView that draws the border and background itself in the appropriate colors. This view needs to be able to draw the borders in 4 different.. a custom UIView that draws the border and background itself in the appropriate colors. This view needs to be able to draw the borders in 4 different modes rounded on the top for the first cell in a section rounded on the bottom for the last 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..
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.. placed. void CreatePDFFile CGRect pageRect const char filename This code block sets up our PDF Context so that we can draw to it CGContextRef pdfContext CFStringRef path CFURLRef url CFMutableDictionaryRef myDictionary NULL Create a CFString from.. myDictionary Cleanup our mess CFRelease myDictionary CFRelease url Done creating our PDF Context now it's time to draw to it Starts our first page CGContextBeginPage pdfContext pageRect Draws a black rectangle around the page inset by 50 on..
Inner shadow effect on UIView layer? http://stackoverflow.com/questions/4431292/inner-shadow-effect-on-uiview-layer I'd like to add an inner shadow effect to it but I am not quite sure how to do this. I suppose I would be required to draw in drawRect however this would add the layer on top of other UIView objects since it's supposed to be a bar behind some.. to add an inner shadow effect to it but I am not quite sure how to do this. I suppose I would be required to draw in drawRect however this would add the layer on top of other UIView objects since it's supposed to be a bar behind some buttons.. Help appreciated... iphone core graphics calayer share improve this question For anyone else wondering how to draw an inner shadow using Core Graphics as per Costique suggestion then this is how on iOS adjust as needed In your drawRect..
iOS UIImagePickerController result image orientation after upload http://stackoverflow.com/questions/5427656/ios-uiimagepickercontroller-result-image-orientation-after-upload case UIImageOrientationDown case UIImageOrientationLeft case UIImageOrientationRight break Now we draw the underlying CGImage into a new context applying the transform calculated above. CGContextRef ctx CGBitmapContextCreate.. 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..
http://stackoverflow.com/questions/603907/uiimage-resize-then-crop enough to hold my hand Every code example I have found so far seems to smash the image be upside down look like crap draw out of bounds or otherwise just not work correctly. Thank you SO much for your help. iphone ios image processing core graphics.. thumbnailPoint thumbnailRect.size.width scaledWidth thumbnailRect.size.height scaledHeight sourceImage drawInRect thumbnailRect newImage UIGraphicsGetImageFromCurrentImageContext if newImage nil NSLog @ could not scale image pop..
How do I draw a line on the iPhone? http://stackoverflow.com/questions/856354/how-do-i-draw-a-line-on-the-iphone 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.. 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.. 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..
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.. me https discussions.apple.com thread 1779814 start 0 tstart 0 My code looks like CGContextSaveGState context CGContextDrawLinearGradient context gradient CGPointMake 0 centY halfWidth CGPointMake 0 centY halfWidth 0 Add text CGContextSetFillColorWithColor.. locations 0.0 1.0 CGGradientRef gradient CGGradientCreateWithColors colorSpace CFArrayRef colors locations CGContextDrawLinearGradient context gradient CGPointMake rect.origin.x rect.size.width 2 rect.origin.y CGPointMake rect.origin.x rect.size.width..
iPhone: How to draw line between two points on MapKit? http://stackoverflow.com/questions/10598322/iphone-how-to-draw-line-between-two-points-on-mapkit How to draw line between two points on MapKit I have Latitude and Longitude of two points and Want to Draw line between these two points with Pin on MapKit. I have googled but Could not find some suitable solution because the one.. c ios ipad mapkit share improve this question Please See this tutorial to draw polyline or route in mkmapview 1 Draw route using mapkit 2 From versions above ios4.0 You can use MKOverlayPathView See Apple Docs Sample code create PolyLine..
Google Map Route Draw on IPhone http://stackoverflow.com/questions/1085749/google-map-route-draw-on-iphone Map Route Draw on IPhone I am developing an application that has two versions. One for web and another for iPhone. In the web app I am.. 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 would I tint an image programatically on the iPhone? http://stackoverflow.com/questions/1117211/how-would-i-tint-an-image-programatically-on-the-iphone like this void drawRect CGRect area CGContextRef context UIGraphicsGetCurrentContext CGContextSaveGState context Draw picture first CGContextDrawImage context self.frame self.image.CGImage Blend mode could be any of CGBlendMode values. Now.. CGRect area CGContextRef context UIGraphicsGetCurrentContext CGContextSaveGState context Draw picture first CGContextDrawImage context self.frame self.image.CGImage Blend mode could be any of CGBlendMode values. Now draw filled rectangle over..
Tricks for improving iPhone UITableView scrolling performance? http://stackoverflow.com/questions/1352479/tricks-for-improving-iphone-uitableview-scrolling-performance used cache for the images used in the table and invalidate all the inactive entries when you receive a memory warning Draw everything in the UITableViewCell 's drawRect if possible avoid subviews at all costs or if you require the standard accessibility..
iPhone development: pointer being freed was not allocated http://stackoverflow.com/questions/1424210/iphone-development-pointer-being-freed-was-not-allocated source.size.height 8 4 source.size.width CGColorSpaceCreateDeviceRGB kCGImageAlphaNoneSkipLast CGContextDrawImage context2 CGRectMake 0 0 source.size.width source.size.height original.CGImage CGImageRef unmasked CGBitmapContextCreateImage.. myMaskingColorsFrameColor CGContextSetRGBFillColor context 256 256 256 1 CGContextFillRect context rect CGContextDrawImage context rect mask UIImage whiteMasked UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return whiteMasked.. 1.0 1.0 Create masked overlay color layer CGImageRef MaskedImage CGImageCreateWithMask baseColor.CGImage mask.CGImage Draw the base color layer CGContextDrawImage context2 rect MaskedImage Get the result of the masking UIImage overlayMasked UIGraphicsGetImageFromCurrentImageContext..
How to get the RGB values for a pixel on an image on the iphone http://stackoverflow.com/questions/144250/how-to-get-the-rgb-values-for-a-pixel-on-an-image-on-the-iphone kCGImageAlphaPremultipliedLast Make sure we have our context if context free pixelData NSLog @ Context not created Draw the image to the bitmap context. The memory allocated for the context for rendering will then contain the raw image pixelData.. the raw image pixelData in the specified color space. CGRect rect 0 0 self.size.width self.size.height CGContextDrawImage context rect self.CGImage Now we can get a pointer to the image pixelData associated with the bitmap context. pixelData..
UISearchBar clear background color or set background image [iphone sdk] http://stackoverflow.com/questions/2139115/uisearchbar-clear-background-color-or-set-background-image-iphone-sdk really well. You have to override the UISearchBar and then hide both the Background and Segment Control layers. Then Draw the background. @ .m #import UISearchBar.h #import QuartzCore QuartzCore.h @implementation UISearchBar CustomBackground.. subview.alpha 0.0 CGContextTranslateCTM contenxt 0 image.size.height CGContextScaleCTM contenxt 1.0 1.0 CGContextDrawImage contenxt CGRectMake 0 0 image.size.width image.size.height image.CGImage @end @ .h #import Foundation Foundation.h..
http://stackoverflow.com/questions/2635371/how-to-crop-the-uiimage 8 image.size.width 4 CGImageGetColorSpace image.CGImage kCGImageAlphaPremultipliedLast if context NULL Draw the image in the bitmap CGContextDrawImage context CGRectMake 0.0f 0.0f image.size.width image.size.height image.CGImage.. image.CGImage kCGImageAlphaPremultipliedLast if context NULL Draw the image in the bitmap CGContextDrawImage context CGRectMake 0.0f 0.0f image.size.width image.size.height image.CGImage NSUInteger numberOfPixels image.size.width..
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.. core graphics quartz graphics bezier share improve this question Here is few references which can help you Draw a Smooth Curve through a Set of 2D Points with Bezier Primitives Curve fitting Line Smoothing and point weeding share..
http://stackoverflow.com/questions/3729690/draw-part-of-a-circle part of a circle For an iPhone application I want to draw a circle that is only for an x percentage filled. Something like..
iPhone - Draw transparent rectangle on UIView to reveal view beneath http://stackoverflow.com/questions/3800278/iphone-draw-transparent-rectangle-on-uiview-to-reveal-view-beneath Draw transparent rectangle on UIView to reveal view beneath I currently have two UIViews one of a red background and the other..
How to display an image on a MKOverlayView? http://stackoverflow.com/questions/3891850/how-to-display-an-image-on-a-mkoverlayview context preferences floatForKey @ RadarTransparency CGContextAddRect context clipRect CGContextClip context CGContextDrawImage context theRect imageReference image release When I download the image I flip the image so it can be easily drawn in.. CGContextSaveGState imageContext Scale the image to the opposite orientation so it can be easylier drawn with CGContectDrawImage CGContextTranslateCTM imageContext 0 height CGContextScaleCTM imageContext 1.0 1.0 if image.imageOrientation UIImageOrientationLeft.. UIImageOrientationDown CGContextTranslateCTM imageContext width height CGContextRotateCTM imageContext M_PI Draw the image in the context CGContextDrawImage imageContext imageRect imageReference CGContextRestoreGState imageContext After..
How to draw a “speech bubble” on an iPhone? http://stackoverflow.com/questions/4442126/how-to-draw-a-speech-bubble-on-an-iphone context MyPopupLayer popupBorderColor CGContextSetFillColorWithColor context MyPopupLayer popupBackgroundColor Draw and fill the bubble CGContextBeginPath context CGContextMoveToPoint context borderRadius strokeWidth 0.5f strokeWidth HEIGHTOFPOPUPTRIANGLE.. strokeWidth 0.5f HEIGHTOFPOPUPTRIANGLE strokeWidth 0.5f borderRadius strokeWidth CGContextClosePath context CGContextDrawPath context kCGPathFillStroke Draw a clipping path for the fill CGContextBeginPath context CGContextMoveToPoint context.. strokeWidth 0.5f borderRadius strokeWidth CGContextClosePath context CGContextDrawPath context kCGPathFillStroke Draw a clipping path for the fill CGContextBeginPath context CGContextMoveToPoint context borderRadius strokeWidth 0.5f round..
What's the best approach to draw lines between views? http://stackoverflow.com/questions/5847876/whats-the-best-approach-to-draw-lines-between-views allocation memory copying and CPU GPU communication. On the other hand what you really want to do is lightweight Draw a line probably animating start end points width color alpha ... There's an easy way to do this completely avoiding the..
How to write text on image in objective-c iPhone? http://stackoverflow.com/questions/6992830/how-to-write-text-on-image-in-objective-c-iphone button. Please provide any sample code or any suggestion for it. iphone uiimageview share improve this question Draw text inside an image and return the resulting image UIImage drawText NSString text inImage UIImage image atPoint CGPoint..
http://stackoverflow.com/questions/7825220/draw-text-in-circle-overlay text in circle overlay I'm trying to draw some circle overlays containing text on MKMapView. I have subclassed the MKCircleView..
Make Background of UIView a Gradient Without Sub Classing http://stackoverflow.com/questions/844710/make-background-of-uiview-a-gradient-without-sub-classing 0.0f 0.0f 0.0f 0.0f CGGradientRef myGradient CGGradientCreateWithColorComponents colorSpace colorList locationList 2 Draw Gradient Here CGContextDrawLinearGradient bitmapContext myGradient CGPointMake 0.0f 0.0f CGPointMake 320.0f 480.0f 0 Create.. myGradient CGGradientCreateWithColorComponents colorSpace colorList locationList 2 Draw Gradient Here CGContextDrawLinearGradient bitmapContext myGradient CGPointMake 0.0f 0.0f CGPointMake 320.0f 480.0f 0 Create a CGImage from context CGImageRef..
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