2014/10/15 下午 10:15:17

iphone Programming Glossary: uigraphicsbeginimagecontextwithoptions

How to share an image on Instagram in iOS?

http://stackoverflow.com/questions/11393071/how-to-share-an-image-on-instagram-in-ios

@property nonatomic retain UIDocumentInteractionController dic CGRect rect CGRectMake 0 0 0 0 UIGraphicsBeginImageContextWithOptions self.view.bounds.size self.view.opaque 0.0 self.view.layer renderInContext UIGraphicsGetCurrentContext UIGraphicsEndImageContext..

iPhone - How do you color an image?

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

4. UIImage imageWithOverlayColor UIColor color CGRect rect CGRectMake 0.0f 0.0f self.size.width self.size.height if UIGraphicsBeginImageContextWithOptions CGFloat imageScale 1.0f if self respondsToSelector @selector scale The scale property is new with iOS4. imageScale self.scale.. imageScale 1.0f if self respondsToSelector @selector scale The scale property is new with iOS4. imageScale self.scale UIGraphicsBeginImageContextWithOptions self.size NO imageScale else UIGraphicsBeginImageContext self.size self drawInRect rect CGContextRef context UIGraphicsGetCurrentContext..

Howe to capture UIView top UIView

http://stackoverflow.com/questions/14049796/howe-to-capture-uiview-top-uiview

compiler does not reach to this.I am using this in my UIView .where I am going wrong UIImage imageWithView UIView view UIGraphicsBeginImageContextWithOptions view.bounds.size view.opaque 0.0 view.layer renderInContext UIGraphicsGetCurrentContext UIImage img UIGraphicsGetImageFromCurrentImageContext..

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

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

UIWindow window UIApplication sharedApplication windows objectAtIndex 0 const CGFloat scale window.screen.scale UIGraphicsBeginImageContextWithOptions rect.size NO scale CGContextRef context UIGraphicsGetCurrentContext CGContextBeginPath context CGContextSaveGState context.. float weight 5 0.1270270270 0.1945945946 0.1216216216 0.0540540541 0.0162162162 Blur horizontally UIGraphicsBeginImageContextWithOptions self.size NO self.scale self drawInRect CGRectMake 0 0 self.size.width self.size.height blendMode kCGBlendModeNormal alpha.. weight x UIImage horizBlurredImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext Blur vertically UIGraphicsBeginImageContextWithOptions self.size NO self.scale horizBlurredImage drawInRect CGRectMake 0 0 self.size.width self.size.height blendMode kCGBlendModeNormal..

How do I create/render a UIImage from a 3D transformed UIImageView?

http://stackoverflow.com/questions/1949003/how-do-i-create-render-a-uiimage-from-a-3d-transformed-uiimageview

_transform.m14 _transform.m21 _transform.m42 _transform.m11 _transform.m24 _transform.m42 _rect self.bounds if UIGraphicsBeginImageContextWithOptions NULL UIGraphicsBeginImageContextWithOptions _rect.size NO 0.0 else UIGraphicsBeginImageContext _rect.size if UIScreen mainScreen.. _transform.m11 _transform.m24 _transform.m42 _rect self.bounds if UIGraphicsBeginImageContextWithOptions NULL UIGraphicsBeginImageContextWithOptions _rect.size NO 0.0 else UIGraphicsBeginImageContext _rect.size if UIScreen mainScreen respondsToSelector @selector displayLinkWithTarget..

How to take a screenshot programmatically

http://stackoverflow.com/questions/2200736/how-to-take-a-screenshot-programmatically

2011 for retina display change the first line into this if UIScreen mainScreen respondsToSelector @selector scale UIGraphicsBeginImageContextWithOptions self.window.bounds.size NO UIScreen mainScreen .scale else UIGraphicsBeginImageContext self.window.bounds.size share improve..

The simplest way to resize an UIImage?

http://stackoverflow.com/questions/2658738/the-simplest-way-to-resize-an-uiimage

the current device's pixel scaling factor and thus account for Retina resolution . Pass 1.0 to force exact pixel size. UIGraphicsBeginImageContextWithOptions newSize NO 0.0 image drawInRect CGRectMake 0 0 newSize.width newSize.height UIImage newImage UIGraphicsGetImageFromCurrentImageContext..

How do I use the NSString draw functionality to create a UIImage from text

http://stackoverflow.com/questions/2765537/how-do-i-use-the-nsstring-draw-functionality-to-create-a-uiimage-from-text

text set the font type and size UIFont font UIFont systemFontOfSize 20.0 CGSize size text sizeWithFont font check if UIGraphicsBeginImageContextWithOptions is available iOS is 4.0 if UIGraphicsBeginImageContextWithOptions NULL UIGraphicsBeginImageContextWithOptions size NO 0.0.. 20.0 CGSize size text sizeWithFont font check if UIGraphicsBeginImageContextWithOptions is available iOS is 4.0 if UIGraphicsBeginImageContextWithOptions NULL UIGraphicsBeginImageContextWithOptions size NO 0.0 else iOS is 4.0 UIGraphicsBeginImageContext size optional add a.. check if UIGraphicsBeginImageContextWithOptions is available iOS is 4.0 if UIGraphicsBeginImageContextWithOptions NULL UIGraphicsBeginImageContextWithOptions size NO 0.0 else iOS is 4.0 UIGraphicsBeginImageContext size optional add a shadow to avoid clipping the shadow you should..

Inner Shadow in UILabel

http://stackoverflow.com/questions/3231690/inner-shadow-in-uilabel

of iOS you would have to replace the block and use an annoying CGBitmapContext. UIImage blackSquareOfSize CGSize size UIGraphicsBeginImageContextWithOptions size NO 0 UIColor blackColor setFill CGContextFillRect UIGraphicsGetCurrentContext CGRectMake 0 0 size.width size.height.. UIGraphicsEndImageContext return blackSquare CGImageRef createMaskWithSize CGSize size shape void ^ void block UIGraphicsBeginImageContextWithOptions size NO 0 block CGImageRef shape UIGraphicsGetImageFromCurrentImageContext CGImage UIGraphicsEndImageContext CGImageRef.. CGSizeMake 0 1 1.0f UIColor colorWithWhite 0.0 alpha 0.5 CGColor cutout drawAtPoint CGPointZero create negative image UIGraphicsBeginImageContextWithOptions rect.size NO 0 UIColor blackColor setFill custom shape goes here text_ drawAtPoint CGPointMake self.bounds.size.width 2..

Saving UIView contents in iOS 4 with real size of the images inside (i.e. scale contentes up for save)

http://stackoverflow.com/questions/4213529/saving-uiview-contents-in-ios-4-with-real-size-of-the-images-inside-i-e-scale

#import QuartzCore QuartzCore.h @implementation UIView Ext UIImage renderToImage IMPORTANT using weak link on UIKit if UIGraphicsBeginImageContextWithOptions NULL UIGraphicsBeginImageContextWithOptions self.frame.size NO 0.0 else UIGraphicsBeginImageContext self.frame.size self.layer.. UIView Ext UIImage renderToImage IMPORTANT using weak link on UIKit if UIGraphicsBeginImageContextWithOptions NULL UIGraphicsBeginImageContextWithOptions self.frame.size NO 0.0 else UIGraphicsBeginImageContext self.frame.size self.layer renderInContext UIGraphicsGetCurrentContext..

How to capture UIView to UIImage without loss of quality on retina display

http://stackoverflow.com/questions/4334233/how-to-capture-uiview-to-uiimage-without-loss-of-quality-on-retina-display

scale retina display image capture share improve this question Switch from use of UIGraphicsBeginImageContext to UIGraphicsBeginImageContextWithOptions as documented on this page . Pass 0.0 for scale the third argument and you'll get a context with a scale factor equal to.. less sharp than everything around it. So I guess #import QuartzCore QuartzCore.h UIImage imageWithView UIView view UIGraphicsBeginImageContextWithOptions view.bounds.size view.opaque 0.0 view.layer renderInContext UIGraphicsGetCurrentContext UIImage img UIGraphicsGetImageFromCurrentImageContext..