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2014/10/15 ¤U¤È 10:05:01
iphone Programming Glossary: cgcontextsetalphahttp://stackoverflow.com/questions/1698971/uiimage-color-changing alpha 1.0 CGContextSetFillColorWithColor context color.CGColor CGContextSetBlendMode context kCGBlendModeOverlay CGContextSetAlpha context alpha CGContextFillRect UIGraphicsGetCurrentContext CGRectMake CGPointZero.x CGPointZero.y image.size.width image.size.height..
Setting A CGContext Transparent Background http://stackoverflow.com/questions/2125543/setting-a-cgcontext-transparent-background CGContextRef context UIGraphicsGetCurrentContext CGContextSetFillColorWithColor context UIColor clearColor .CGColor CGContextSetAlpha context 0.0 CGContextFillRect context rect CGContextSetStrokeColorWithColor context UIColor whiteColor .CGColor CGContextSetLineWidth..
How do I add an outer glow to a UIImage or UIImageView or UIView http://stackoverflow.com/questions/2278440/how-do-i-add-an-outer-glow-to-a-uiimage-or-uiimageview-or-uiview NULL CGContextClearRect ctx newSize you can repeat this process to build glow. CGContextDrawImage ctx newSize theImage CGContextSetAlpha ctx 0.2 CGContextEndTransparencyLayer ctx draw the original image into the context offset to be centered CGRect centerRect..
Must drawInRect: for a separate context be executed on the main thread? http://stackoverflow.com/questions/3207536/must-drawinrect-for-a-separate-context-be-executed-on-the-main-thread the first thumbnail Error CGContextSaveGState invalid context Error CGContextSetBlendMode invalid context Error CGContextSetAlpha invalid context Error CGContextTranslateCTM invalid context Error CGContextScaleCTM invalid context Error CGContextDrawImage..
How to display an image on a MKOverlayView? http://stackoverflow.com/questions/3891850/how-to-display-an-image-on-a-mkoverlayview theMapRect CGRect clipRect self rectForMapRect mapRect NSUserDefaults preferences NSUserDefaults standardUserDefaults CGContextSetAlpha context preferences floatForKey @ RadarTransparency CGContextAddRect context clipRect CGContextClip context CGContextDrawImage..
http://stackoverflow.com/questions/4117182/mkoverlay-view-is-blurred provider save context before screwing with it CGContextSaveGState context CGContextScaleCTM context 1.0 1.0 CGContextSetAlpha context 1.0 get the overlay bounds MKMapRect theMapRect self.overlay boundingMapRect CGRect theRect self rectForMapRect..
Drawing waveform with AVAssetReader http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader CGContextRef context UIGraphicsGetCurrentContext CGContextSetFillColorWithColor context UIColor blackColor .CGColor CGContextSetAlpha context 1.0 CGRect rect rect.size imageSize rect.origin.x 0 rect.origin.y 0 CGColorRef leftcolor UIColor whiteColor CGColor.. CGContextRef context UIGraphicsGetCurrentContext CGContextSetFillColorWithColor context UIColor blackColor .CGColor CGContextSetAlpha context 1.0 CGRect rect rect.size imageSize rect.origin.x 0 rect.origin.y 0 CGColorRef leftcolor UIColor whiteColor CGColor..
calling drawRect in a UIView subclass http://stackoverflow.com/questions/9407162/calling-drawrect-in-a-uiview-subclass invalid context 0x0 Feb 22 20 24 38 Error CGContextSetBlendMode invalid context 0x0 Feb 22 20 24 38 Error CGContextSetAlpha invalid context 0x0 Feb 22 20 24 38 Error CGContextTranslateCTM invalid context 0x0 Feb 22 20 24 38 Error CGContextScaleCTM..
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