Matt Wymore mattwymore
mattwymore
/ RXTimer.h
Created
November 14, 2015 23:28
— forked from couchdeveloper/RXTimer.h
A timer based on dispatch_source_create()
Objective-C
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| // | |
| // RXTimer.h | |
| // | |
| // Copyright 2013 Andreas Grosam | |
| // | |
| // Licensed under the Apache License, Version 2.0 (the "License"); | |
| // you may not use this file except in compliance with the License. | |
| // You may obtain a copy of the License at | |
| // | |
| // http://www.apache.org/licenses/LICENSE-2.0 |
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| //Got this from http://stackoverflow.com/questions/3139619/check-that-an-email-address-is-valid-on-ios for | |
| //validating whether an email address appears to be valid | |
| - (BOOL) NSStringIsValidEmail:(NSString *)checkString | |
| { | |
| BOOL stricterFilter = YES; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/ | |
| NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}"; | |
| NSString *laxString = @".+@([A-Za-z0-9]+\\.)+[A-Za-z]{2}[A-Za-z]*"; | |
| NSString *emailRegex = stricterFilter ? stricterFilterString : laxString; | |
| NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; |
mattwymore
/ gist:9416392
Last active
August 29, 2015 13:57
This is an example of taking an array of data and writing it to "path" as a PNG file. This example shows how to properly premultiply alpha in the image as required by CGBitmapContextCreate.
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| //"bytes" is a pointer to a const array of image data that we can't modify, so we need to copy | |
| //the data to a new buffer before multiplying alpha | |
| //Premultiply the alpha and create a new image | |
| UInt8 *premultipliedBuffer = calloc(totalBytes, 1); | |
| memcpy(premultipliedBuffer, bytes, totalBytes); | |
| for (int i = 0; i < totalBytes; i += 4) | |
| { | |
| UInt8 red = premultipliedBuffer[i]; | |
| UInt8 green = premultipliedBuffer[i + 1]; |
mattwymore
/ gist:9416196
Last active
August 29, 2015 13:57
This allows you to read a PNG image from "path" using Core Graphics functions and then access the bytes that back the image.
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| //path is a plain C string with the path to your image | |
| CGDataProviderRef sourceDataProvider = CGDataProviderCreateWithFilename(path); | |
| CGImageRef sourceImage = CGImageCreateWithPNGDataProvider(sourceDataProvider, | |
| NULL, | |
| NO, | |
| kCGRenderingIntentDefault); | |
| CGDataProviderRelease(sourceDataProvider); | |
| CGDataProviderRef sourceProvider = CGImageGetDataProvider(sourceImage); | |
| size_t width = CGImageGetWidth(sourceImage); | |
| size_t height = CGImageGetHeight(sourceImage); |
mattwymore
/ gist:6602176
Created
September 17, 2013 23:29
This is a handy one-liner to get objective-C method names from Mach-O binaries. I used it because the Xcode validator flagged usage of a private API and I needed to find which 3rd party library was using the private method. source: http://stackoverflow.com/a/4534619
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| otool -s __TEXT __objc_methname "$1" |expand -8 | cut -c17- | sed -n '3,$p' | perl -n -e 'print join("\n",split(/\x00/,scalar reverse (reverse unpack("(a4)*",pack("(H8)*",split(/\s/,$_))))))' |
mattwymore
/ versionMacros.h
Last active
July 1, 2016 09:34
Macros for comparing iOS Version numbers.
See: http://stackoverflow.com/questions/3339722/check-iphone-ios-version for more discussion
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| #define SYSTEM_VERSION_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedSame) | |
| #define SYSTEM_VERSION_GREATER_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedDescending) | |
| #define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending) | |
| #define SYSTEM_VERSION_LESS_THAN(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] == NSOrderedAscending) | |
| #define SYSTEM_VERSION_LESS_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedDescending) |