2014/10/15 下午 10:05:01

iphone Programming Glossary: cgcontextrestoregstate

Drawing rotated text with NSString drawInRect

http://stackoverflow.com/questions/10289898/drawing-rotated-text-with-nsstring-drawinrect

alignment UITextAlignmentLeft Clean up CGGradientRelease gradient CGColorSpaceRelease colorSpace CGContextRestoreGState context Note that you can also get the size of how the string will be rendered which can help in doing calculations for..

How to create a UIImage from the current graphics context?

http://stackoverflow.com/questions/1112947/how-to-create-a-uiimage-from-the-current-graphics-context

_pathArray i CGPathRef path CFArrayGetValueAtIndex _pathArray i CGContextAddPath c path CGContextStrokePath c CGContextRestoreGState c ... where _pathArray is of type CFArrayRef and is populated every time touchesEnded is invoked. Also note that drawRect..

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

CGContextSetFillColor context CGColorGetComponents self.overlayColor.CGColor CGContextFillRect context self.bounds CGContextRestoreGState context Ordinarily to optimize the drawing you would restrict the actual drawing to only the area passed in to drawRect..

How can I change the saturation of an UIImage?

http://stackoverflow.com/questions/1144768/how-can-i-change-the-saturation-of-an-uiimage

to within alpha channel CGContextSetRGBFillColor context 0.0 0.0 0.0 desaturation CGContextFillRect context rect CGContextRestoreGState context restore state to reset blend mode @end Now in your view controller's viewDidLoad method put the view on screen and..

iPhone - How do you color an image?

http://stackoverflow.com/questions/1223340/iphone-how-do-you-color-an-image

CGContextSaveGState ctx CGContextClipToMask ctx area baseImage.CGImage theColor set CGContextFillRect ctx area CGContextRestoreGState ctx CGContextSetBlendMode ctx kCGBlendModeNormal CGContextDrawImage ctx area baseImage.CGImage UIImage newImage UIGraphicsGetImageFromCurrentImageContext..

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

context gradient topCenter midCenter 0 CGGradientRelease gradient CGColorSpaceRelease rgbColorspace CGContextRestoreGState context One shortcoming of this approach is that the Core Graphics functions I use don't handle Unicode text properly. What..

Blur an image of specific part (rectangular, circular)?

http://stackoverflow.com/questions/14107979/blur-an-image-of-specific-part-rectangular-circular

0.0f 0.0f rectWidth 2.0f 0.0f radious CGContextAddArcToPoint context rectWidth 0.0f rectWidth rectHeight 2.0f radious CGContextRestoreGState context CGContextClosePath context CGContextClip context image drawInRect CGRectMake 0.0f 0.0f imageWidth imageHeight UIImage..

Rounded Corners on UIImage

http://stackoverflow.com/questions/205431/rounded-corners-on-uiimage

CGContextClip maskedContextRef self drawInRect dstRect maskedImage UIGraphicsGetImageFromCurrentImageContext CGContextRestoreGState maskedContextRef UIGraphicsEndImageContext return maskedImage and here's the crash log. It looks the same whenever I get..

Rounded UIView using CALayers - only some corners - How?

http://stackoverflow.com/questions/2264083/rounded-uiview-using-calayers-only-some-corners-how

rect.origin.x radius rect.origin.y radius radius M_PI 2 M_PI 1 add the other corners here CGContextClosePath context CGContextRestoreGState context UIImage setImage UIImage img UIImage imageNamed @ my_image.png int w img.size.width int h img.size.height CGColorSpaceRef..

Curve text on existing circle

http://stackoverflow.com/questions/3841642/curve-text-on-existing-circle

90 CGContextShowTextAtPoint context 0 textSize.width 2 0 textSize.height 2 menuItemTextChar strlen menuItemTextChar CGContextRestoreGState context totalRotation perSectionDegrees CGImageRef contextImage CGBitmapContextCreateImage context CGContextRelease context.. context x y CGContextRotateCTM context angle 0.5 M_PI CGContextShowTextAtPoint context 0 0 c strlen c CGContextRestoreGState context angle letterAngle UIImage createMenuRingWithFrame CGRect frame CGPoint centerPoint CGPointMake frame.size.width.. text in sections self drawStringAtContext context string text atAngle angle withRadius textRadius angle angleStep CGContextRestoreGState context CGImageRef contextImage CGBitmapContextCreateImage context CGContextRelease context CGColorSpaceRelease colorSpace..

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

how to fit pdf page in entire view

http://stackoverflow.com/questions/4321681/how-to-fit-pdf-page-in-entire-view

ctx kCGInterpolationHigh CGContextSetRenderingIntent ctx kCGRenderingIntentDefault CGContextDrawPDFPage ctx myPageRef CGContextRestoreGState ctx loadingIndicator stopAnimating loadingIndicator1 stopAnimating loadingIndicator2 stopAnimating it reads displays pdf..

Draw text in circle overlay

http://stackoverflow.com/questions/7825220/draw-text-in-circle-overlay

withFont UIFont fontWithName @ Arial size 10.0 lineBreakMode UILineBreakModeClip alignment UITextAlignmentCenter CGContextRestoreGState context UIGraphicsPopContext When debugging I get values like these MKC 43253760.000000 104071168.000000 1.776503 1.999245..

How do I draw a shadow under a UIView?

http://stackoverflow.com/questions/805872/how-do-i-draw-a-shadow-under-a-uiview

UIGraphicsGetCurrentContext CGContextSaveGState currentContext CGContextSetShadow currentContext CGSizeMake 15 20 5 CGContextRestoreGState currentContext super drawRect rect ..but this doesn't work for me and I'm a bit stuck about a where to go next and b if.. affected by the shadow setting needs to happen after CGContextSetShadow currentContext CGSizeMake 15 20 5 but before CGContextRestoreGState currentContext So if you want the superclass's drawRect to be 'wrapped' in a shadow then how about if you rearrange your..

How to mask a square image into an image with round corners in the iPhone SDK?

http://stackoverflow.com/questions/996292/how-to-mask-a-square-image-into-an-image-with-round-corners-in-the-iphone-sdk

1 CGContextAddArcToPoint context 0 0 fw 2 0 1 CGContextAddArcToPoint context fw 0 fw fh 2 1 CGContextClosePath context CGContextRestoreGState context And then call CGContextClip context to clip it to the rectangle path. Now any drawing done including drawing an..