Andrew Mackross mackross
jspahrsummers
/ ImageLoading.m
Last active
December 29, 2015 03:59
Using -flatten:withPolicy: (from ReactiveCocoa 3.0) and related operators to deal with producers that can outstrip consumers
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| // Asynchronously loads UIImages from the given URLs, but throttles the loading | |
| // to keep memory and CPU usage sane. | |
| - (RACSignal *)loadImagesAtURLs:(NSArray *)imageURLs { | |
| // Map each URL to a signal of work. The result is a signal of work signals. | |
| return [[imageURLs.rac_signal | |
| map:^(NSURL *imageURL) { | |
| return [[[[NSURLConnection | |
| // Load the URL asynchronously. | |
| rac_sendAsynchronousRequest:[NSURLRequest requestWithURL:imageURL]] | |
| reduceEach:^(NSURLResponse *response, NSData *data) { |
steipete
/ PSPDFUIKitMainThreadGuard.m
Last active
March 10, 2024 19:23
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> |
jamesmoschou
/ UIResponder+FirstResponder.h
Created
May 25, 2013 06:23
A category on the UIResponder class to obtain the first responder object.
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| @interface UIResponder (FirstResponder) | |
| + (UIResponder *)firstResponder; | |
| @end |