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2014/10/15 ¤U¤È 10:07:39
iphone Programming Glossary: drawsHow to create a UIImage from the current graphics context? http://stackoverflow.com/questions/1112947/how-to-create-a-uiimage-from-the-current-graphics-context and is populated every time touchesEnded is invoked. Also note that drawRect may be invoked several times as the user draws. When the user is done I'd like to create a UIImage object that represents the graphics context. Any suggestions on how..
Finding Path/Route Between two points on MapKit in iPhone http://stackoverflow.com/questions/12002179/finding-path-route-between-two-points-on-mapkit-in-iphone and draw a line iphone objective c ios mapkit share improve this question Below is the code to finds path draws line between two locations. To implement below class _mapRecord PSMapDirection alloc initWithFrame CGRectMake 0.0 49.0 320.0..
Iphone CGContextShowTextAtPoint for Japanese characters http://stackoverflow.com/questions/1237565/iphone-cgcontextshowtextatpoint-for-japanese-characters you CTFontGetGlyphsForCharacters iOS 3.2 onwards maps Unicode characters to glyphs CTFontDrawGlyphs iOS 4.2 onwards draws the glyphs into a CGContext. NB. CGContextShowGlyphs should work but I never found a way to convert my UniChars to glyphs...
How do I add a gradient to the text of a UILabel, but not the background? http://stackoverflow.com/questions/1266179/how-do-i-add-a-gradient-to-the-text-of-a-uilabel-but-not-the-background the text drawing mode to intersect the drawn text with the clipping path clips the area to draw to the text and then draws a gradient. The gradient will only fill the text not the background. I tried using NSString's drawAtPoint method for this..
When to use CALayer on the Mac/iPhone? http://stackoverflow.com/questions/1447598/when-to-use-calayer-on-the-mac-iphone that interface in its Mac counterpart. For another example of this I direct you to the Core Plot framework which draws graphs entirely using CALayers and works on both Mac and iPhone. CALayers are pretty much the same on both platforms where..
http://stackoverflow.com/questions/1494836/mkmapview-route-directions Maps Directions API mentioned and exposed here Also you should take a look at the sample IPhone application which draws routes directions onto MKMapView using the API mentioned above here But warning you about the licencing issues about the..
Drawing incrementally in a UIView (iPhone) http://stackoverflow.com/questions/1798414/drawing-incrementally-in-a-uiview-iphone is just as slow and the color blending doesn't work. Any other method I could try Method B saving the previous draws in a UIImage and only drawing the new stuff and this image void drawRect CGRect rect draw on top of the previous stuff UIGraphicsBeginImageContext..
Accordion table cell - How to dynamically expand/contract uitableviewcell? http://stackoverflow.com/questions/3066167/accordion-table-cell-how-to-dynamically-expand-contract-uitableviewcell I have done is subclassed UITableViewCell with a custom class which contains an instance of a UIView which actually draws the view which i then add to the table cells contentview. void setSelected BOOL selected animated BOOL animated if selected..
http://stackoverflow.com/questions/3231690/inner-shadow-in-uilabel is resolution independent. First a graphical explanation of what the code does. The shape here is a circle. The code draws text with a white dropshadow. If it's not required the code could be refactored further because the dropshadow needs to..
iphone/ipad: How exactly use NSAttributedString? http://stackoverflow.com/questions/3786528/iphone-ipad-how-exactly-use-nsattributedstring improve this question You should take a look at AliSoftware's OHAttributedLabel . It is a subclass of UILabel that draws an NSAttributedString and also provides convenience methods for setting the attributes of an NSAttributedString from UIKit..
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..
Animation in OpenGL ES view freezes when UIScrollView is dragged on iPhone http://stackoverflow.com/questions/4876488/animation-in-opengl-es-view-freezes-when-uiscrollview-is-dragged-on-iphone on iPhone I have an animated transparent OpenGL ES subview a modification of Apple's template EAGLView class which draws a rotating sphere. Just like Apple's example CADisplayLink is used on devices where available. On the same screen there..
CGContextDrawImage draws image upside down when passed UIImage.CGImage http://stackoverflow.com/questions/506622/cgcontextdrawimage-draws-image-upside-down-when-passed-uiimage-cgimage draws image upside down when passed UIImage.CGImage Does anyone know why CGContextDrawImage would be drawing my image upside..
How to draw a transparent stroke (or anyway clear part of an image) on the iPhone http://stackoverflow.com/questions/629409/how-to-draw-a-transparent-stroke-or-anyway-clear-part-of-an-image-on-the-iphon screen with the finger. Yes nothing original but it's part of something larger . I have a UIImageView where the user draws by creating a CGContextRef and the various CG draw functions. I primarily draw strokes lines with the function CGContextAddLineToPoint..
iOS CVImageBuffer distorted from AVCaptureSessionDataOutput with AVCaptureSessionPresetPhoto http://stackoverflow.com/questions/6540710/ios-cvimagebuffer-distorted-from-avcapturesessiondataoutput-with-avcapturesessio sampleBuffer self.delegate processNewCameraFrame pixelBuffer 6 Then the delegate processes draws them void processNewCameraFrame CVImageBufferRef cameraFrame CVPixelBufferLockBaseAddress cameraFrame 0 int bufferHeight..
Is programmatically inverting the colors of an image possible? http://stackoverflow.com/questions/6672517/is-programmatically-inverting-the-colors-of-an-image-possible adds a category method to UIImage that creates a clear CoreGraphics bitmap context that it can access the memory of draws the UIImage to it runs through every pixel converting from premultiplied alpha to uninflected RGB inverting each channel..
iPhone Core Animation - Drawing a Circle http://stackoverflow.com/questions/7991086/iphone-core-animation-drawing-a-circle The best way I can explain this is if you can imagine drawing a circle. It starts at the top or 12 o clock and draws clockwise all the way around until it becomes a complete circle over the space of 10 or so seconds. The closet I have come..
How to override -drawrect in UIButton subclass? http://stackoverflow.com/questions/816024/how-to-override-drawrect-in-uibutton-subclass need. The problem is that the text ends up under the button. After I write my text UIButton's drawrect goes ahead and draws on top of me. I am not even calling super drawrect rect even though I was anticipating calling it before I did my drawing...
How do I draw a line on the iPhone? http://stackoverflow.com/questions/856354/how-do-i-draw-a-line-on-the-iphone dropdown and choose MyView. Next you need to implement the drawRect method in MyView.m here's some example code that draws a line void drawRect CGRect rect CGContextRef c UIGraphicsGetCurrentContext CGFloat red 4 1.0f 0.0f 0.0f 1.0f CGContextSetStrokeColor..
MKMapView: Instead of Annotation Pin, a custom view http://stackoverflow.com/questions/9814988/mkmapview-instead-of-annotation-pin-a-custom-view MKPinAnnotationView is a subclass of MKAnnotationView so it has an image property but it generally overrides that and draws a pin image that's what it's for . So change the code to MKAnnotationView mapView MKMapView mV viewForAnnotation id MKAnnotation..
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