Nikita Denin Narmo
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mattt
/ Maths.swift
Last active
April 21, 2023 17:14
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| // See: https://devforums.apple.com/message/1000934#1000934 | |
| import Foundation | |
| // Logic | |
| operator prefix ¬ {} | |
| @prefix func ¬ (value: Bool) -> Bool { | |
| return !value | |
| } |
mattt
/ UTTypeForImageData.m
Created
March 27, 2014 23:19
A quick function for determining an image's file type by its first couple of bytes
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| @import MobileCoreServices; | |
| static CFStringRef UTTypeForImageData(NSData *data) { | |
| const unsigned char * bytes = [data bytes]; | |
| if (data.length >= 8) { | |
| if (bytes[0] == 0x89 && bytes[1] == 0x50 && bytes[2] == 0x4E && bytes[3] == 0x47 && bytes[4] == 0x0D && bytes[5] == 0x0A && bytes[6] == 0x1A && bytes[7] == 0x0A) { | |
| return kUTTypePNG; | |
| } | |
| } |
steipete
/ PSPDFUIKitMainThreadGuard.m
Last active
October 30, 2025 15:53
This is a guard that tracks down UIKit access on threads other than main. This snippet is taken from the commercial iOS PDF framework http://pspdfkit.com, but relicensed under MIT. Works because a lot of calls internally call setNeedsDisplay or setNeedsLayout. Won't catch everything, but it's very lightweight and usually does the job.You might n…
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| // Taken from the commercial iOS PDF framework http://pspdfkit.com. | |
| // Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved. | |
| // Licensed under MIT (http://opensource.org/licenses/MIT) | |
| // | |
| // You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it. | |
| // PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit. | |
| #import <objc/runtime.h> | |
| #import <objc/message.h> |