2014/10/15 下午 10:11:40

iphone Programming Glossary: mycontext

Core Data: Quickest way to delete all instances of an entity

http://stackoverflow.com/questions/1383598/core-data-quickest-way-to-delete-all-instances-of-an-entity

allCars NSFetchRequest alloc init allCars setEntity NSEntityDescription entityForName @ Car inManagedObjectContext myContext allCars setIncludesPropertyValues NO only fetch the managedObjectID NSError error nil NSArray cars myContext executeFetchRequest.. myContext allCars setIncludesPropertyValues NO only fetch the managedObjectID NSError error nil NSArray cars myContext executeFetchRequest allCars error error allCars release error handling goes here for NSManagedObject car in cars myContext..

composite colors: CALayer and blend mode on iPhone

http://stackoverflow.com/questions/1658751/composite-colors-calayer-and-blend-mode-on-iphone

their colors. Here is my code @implementation WhiteLayerHelper void drawLayer CALayer theLayer inContext CGContextRef myContext draw a white overlay with special blending and alpha values so that the saturation can be animated CGContextSetBlendMode.. a white overlay with special blending and alpha values so that the saturation can be animated CGContextSetBlendMode myContext kCGBlendModeSaturation CGContextSetRGBFillColor myContext 1.0 1.0 1.0 0.9 CGContextFillRect myContext UIScreen mainScreen.. so that the saturation can be animated CGContextSetBlendMode myContext kCGBlendModeSaturation CGContextSetRGBFillColor myContext 1.0 1.0 1.0 0.9 CGContextFillRect myContext UIScreen mainScreen .bounds @end And here is the main view drawrect code where..

How to draw an UIImage or directly in -drawRect:?

http://stackoverflow.com/questions/1663815/how-to-draw-an-uiimage-or-directly-in-drawrect

overwrite drawRect and draw my UIView directly. For example my code looks like void drawRect CGRect rect CGContextRef myContext UIGraphicsGetCurrentContext UIImage img UIImage imageNamed @ foo.png how to draw the directly into the view now iphone..

Reading PDF files as string through iPhone application

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

CGPDFScannerPopName s name return printf EMC s n name a method to display pdf page. void MyDisplayPDFPage CGContextRef myContext size_t pageNumber const char filename CGPDFDocumentRef document CGPDFPageRef page document MyGetPDFDocumentRef filename.. @ @ testing it s CFRelease s CFDataRef data CGPDFStreamCopyData stream CGPDFDataFormatRaw CGContextDrawPDFPage myContext page 3 CGContextTranslateCTM myContext 0 20 CGContextScaleCTM myContext 1.0 1.0 CGPDFDocumentRelease document 4 void viewDidLoad.. data CGPDFStreamCopyData stream CGPDFDataFormatRaw CGContextDrawPDFPage myContext page 3 CGContextTranslateCTM myContext 0 20 CGContextScaleCTM myContext 1.0 1.0 CGPDFDocumentRelease document 4 void viewDidLoad super viewDidLoad code for..