2014/10/15 下午 10:15:17

iphone Programming Glossary: uigraphicsgetimagefromcurrentimagecontext

http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees

http://stackoverflow.com/questions/1703100/resize-uiimage-with-aspect-ratio

value drawInRect screenRect blendMode kCGBlendModePlusDarker alpha 1 UIImage tmpValue UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext Which is working great as long as the aspect ratio of the image matches that..

How to take a screenshot programmatically

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

self.window.layer renderInContext UIGraphicsGetCurrentContext UIImage image UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext NSData data UIImagePNGRepresentation image data writeToFile @ foo.png atomically..

The simplest way to resize an UIImage?

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

newSize NO 0.0 image drawInRect CGRectMake 0 0 newSize.width newSize.height UIImage newImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return newImage Example usage #import MYUtil.h UIImage myIcon MYUtil imageWithImage..

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

view.bounds.size view.layer renderInContext UIGraphicsGetCurrentContext UIImage img UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return img iphone uiimage scale retina display image capture share improve..

UIImagePickerController camera preview is portrait in landscape app

http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app

UIImage: Resize, then Crop

http://stackoverflow.com/questions/603907/uiimage-resize-then-crop

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 UIGraphicsEndImageContext..

What's the easiest way to resize/optimize an image size with the iPhone SDK?

http://stackoverflow.com/questions/612131/whats-the-easiest-way-to-resize-optimize-an-image-size-with-the-iphone-sdk

newSize image drawInRect CGRectMake 0 0 newSize.width newSize.height UIImage newImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return newImage As far as storage of the image the fastest image format to..

Changing the background color of a UIAlertView?

http://stackoverflow.com/questions/883208/changing-the-background-color-of-a-uialertview

How to Rotate a UIImage 90 degrees?

http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees

Resize UIImage with aspect ratio?

http://stackoverflow.com/questions/1703100/resize-uiimage-with-aspect-ratio

CGRectMake 0 0 320.0 480.0 UIGraphicsBeginImageContext screenRect.size value drawInRect screenRect blendMode kCGBlendModePlusDarker alpha 1 UIImage tmpValue UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext Which is working great as long as the aspect ratio of the image matches that of the new resized image. I'd like to modify this so that..

How to take a screenshot programmatically

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

share improve this question UIGraphicsBeginImageContext self.window.bounds.size self.window.layer renderInContext UIGraphicsGetCurrentContext UIImage image UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext NSData data UIImagePNGRepresentation image data writeToFile @ foo.png atomically YES UPDATE April 2011 for retina display change the first..

The simplest way to resize an UIImage?

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

to force exact pixel size. UIGraphicsBeginImageContextWithOptions newSize NO 0.0 image drawInRect CGRectMake 0 0 newSize.width newSize.height UIImage newImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return newImage Example usage #import MYUtil.h UIImage myIcon MYUtil imageWithImage myUIImageInstance scaledToSize CGSizeMake 20 20 ..

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

for my issue UIImage imageWithView UIView view UIGraphicsBeginImageContext view.bounds.size view.layer renderInContext UIGraphicsGetCurrentContext UIImage img UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return img iphone uiimage scale retina display image capture share improve this question Switch from use of UIGraphicsBeginImageContext..

UIImagePickerController camera preview is portrait in landscape app

http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app

UIImage: Resize, then Crop

http://stackoverflow.com/questions/603907/uiimage-resize-then-crop

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 UIGraphicsEndImageContext return newImage share improve this answer..

What's the easiest way to resize/optimize an image size with the iPhone SDK?

http://stackoverflow.com/questions/612131/whats-the-easiest-way-to-resize-optimize-an-image-size-with-the-iphone-sdk

UIImage image scaledToSize CGSize newSize UIGraphicsBeginImageContext newSize image drawInRect CGRectMake 0 0 newSize.width newSize.height UIImage newImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return newImage As far as storage of the image the fastest image format to use with the iPhone is PNG because it has optimizations for..

Changing the background color of a UIAlertView?

http://stackoverflow.com/questions/883208/changing-the-background-color-of-a-uialertview

iPhone - How do you color an image?

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

ctx CGContextSetBlendMode ctx kCGBlendModeNormal CGContextDrawImage ctx area baseImage.CGImage UIImage newImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return newImage myImageView.image self colorizeImage UIImage imageNamed @ whiteImage.png color..

blend two uiimages

http://stackoverflow.com/questions/1309757/blend-two-uiimages

is my image to blend in CGContextDrawImage context bounds UIImage imageNamed @ over.png .CGImage UIImage outputImage UIGraphicsGetImageFromCurrentImageContext UIImageWriteToSavedPhotosAlbum outputImage self nil nil clean up drawing environment UIGraphicsEndImageContext but does.. image drawInRect CGRectMake 0 0 newSize.width newSize.height blendMode kCGBlendModeNormal alpha 0.8 UIImage newImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext If the image already has opacity you do not need to set it as in bottomImage otherwise you can..

How to Rotate a UIImage 90 degrees?

http://stackoverflow.com/questions/1315251/how-to-rotate-a-uiimage-90-degrees

Resize UIImage with aspect ratio?

http://stackoverflow.com/questions/1703100/resize-uiimage-with-aspect-ratio

screenRect.size value drawInRect screenRect blendMode kCGBlendModePlusDarker alpha 1 UIImage tmpValue UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext Which is working great as long as the aspect ratio of the image matches that of the new resized..

How to take a screenshot programmatically

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

self.window.bounds.size self.window.layer renderInContext UIGraphicsGetCurrentContext UIImage image UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext NSData data UIImagePNGRepresentation image data writeToFile @ foo.png atomically YES UPDATE April..

How Do I Take a Screen Shot of a UIView?

http://stackoverflow.com/questions/2214957/how-do-i-take-a-screen-shot-of-a-uiview

320 480 CGContextRef context UIGraphicsGetCurrentContext myUIView.layer drawInContext context UIImage screenShot UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext myUIView has dimensions 320x480 an it has some sub views. What is the correct way to do this Thanks..

Reading PDF files as string through iPhone application

http://stackoverflow.com/questions/2362393/reading-pdf-files-as-string-through-iphone-application

initialPage NSBundle mainBundle pathForResource @ MobileHIG ofType @ pdf UTF8String imgV.image UIGraphicsGetImageFromCurrentImageContext imgV.image imgV.image rotate UIImageOrientationDownMirrored void touchesBegan NSSet touches withEvent UIEvent event UITouch.. kCATransitionFromLeft transition.delegate self imgV.layer addAnimation transition forKey nil imgV.image UIGraphicsGetImageFromCurrentImageContext imgV.image imgV.image rotate UIImageOrientationDownMirrored But I didn't get success to read even a single line from the..

The simplest way to resize an UIImage?

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

Getting a screenshot of a UIScrollView, including offscreen parts

http://stackoverflow.com/questions/3539717/getting-a-screenshot-of-a-uiscrollview-including-offscreen-parts

UIGraphicsBeginImageContext contextRect.size self.layer renderInContext UIGraphicsGetCurrentContext UIImage viewImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext do something with the viewImage here. This basically moves to the top of the scroll view and takes.. _scrollView.contentSize.height _scrollView.layer renderInContext UIGraphicsGetCurrentContext image UIGraphicsGetImageFromCurrentImageContext _scrollView.contentOffset savedContentOffset _scrollView.frame savedFrame UIGraphicsEndImageContext if image nil UIImagePNGRepresentation..

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

view UIGraphicsBeginImageContext view.bounds.size view.layer renderInContext UIGraphicsGetCurrentContext UIImage img UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return img iphone uiimage scale retina display image capture share improve this question ..

Drawing waveform with AVAssetReader

http://stackoverflow.com/questions/5032775/drawing-waveform-with-avassetreader

CGContextSetStrokeColorWithColor context rightcolor CGContextStrokePath context Create new image UIImage newImage UIGraphicsGetImageFromCurrentImageContext Tidy up UIGraphicsEndImageContext return newImage Next a method that takes a AVURLAsset and returns PNG image data NSData.. CGContextSetStrokeColorWithColor context rightcolor CGContextStrokePath context Create new image UIImage newImage UIGraphicsGetImageFromCurrentImageContext Tidy up UIGraphicsEndImageContext return newImage NSData renderPNGAudioPictogramLogForAssett AVURLAsset songAsset NSError..

UIImagePickerController camera preview is portrait in landscape app

http://stackoverflow.com/questions/538041/uiimagepickercontroller-camera-preview-is-portrait-in-landscape-app

UIImage: Resize, then Crop

http://stackoverflow.com/questions/603907/uiimage-resize-then-crop

What's the easiest way to resize/optimize an image size with the iPhone SDK?

http://stackoverflow.com/questions/612131/whats-the-easiest-way-to-resize-optimize-an-image-size-with-the-iphone-sdk

UIGraphicsBeginImageContext newSize image drawInRect CGRectMake 0 0 newSize.width newSize.height UIImage newImage UIGraphicsGetImageFromCurrentImageContext UIGraphicsEndImageContext return newImage As far as storage of the image the fastest image format to use with the iPhone..

Changing the background color of a UIAlertView?

http://stackoverflow.com/questions/883208/changing-the-background-color-of-a-uialertview