krin-san

// Taken from http://www.slideshare.net/manuelmaly/reactivecocoa-goodness-part-i-of-ii
// Exact presentation slide: http://image.slidesharecdn.com/presentation-141009165841-conversion-gate01/95/reactivecocoa-goodness-part-i-of-ii-37-638.jpg?cb=1412892113

// Try to repeat signal 3 times
static NSUInteger const retryAttempts  = 2;
static NSTimeInterval const retrydelay = 1.;

RACSignal *signal = ...;
RACSignal *result = [[signal catch:^RACSignal *(NSError *error) {
	return [[[RACSignal empty] delay:retrydelay]

myell0w

// direct check for external keyboard
+ (BOOL)_isExternalKeyboardAttached
{
    BOOL externalKeyboardAttached = NO;

    @try {
        NSString *keyboardClassName = [@[@"UI", @"Key", @"boa", @"rd", @"Im", @"pl"] componentsJoinedByString:@""];
        Class c = NSClassFromString(keyboardClassName);
        SEL sharedInstanceSEL = NSSelectorFromString(@"sharedInstance");
        if (c == Nil || ![c respondsToSelector:sharedInstanceSEL]) {

figgis

#!/usr/bin/env python


"""
- ae(v): context-adaptive arithmetic entropy-coded syntax element. The parsing process for this descriptor is
         specified in clause 9.3.
- b(8):  byte having any pattern of bit string (8 bits). The parsing process
         for this descriptor is specified by the return value of the function
         read_bits( 8 ).
- f(n):  fixed-pattern bit string using n bits written (from left to right)

lexrus

//
//  LTLog.h
//
//  Created by Lex on 6/29/14.
//  Copyright (c) 2014 LexTang.com. All rights reserved.
//  https://gist.github.com/lexrus/8c6414e7c0177e9e66ea
//

#import <Foundation/Foundation.h>

nicklockwood

Suppose we want to add support for a new iOS 8 API in our framework that replaces an older iOS 7 API. There are a few problems we might face:

1. The new API will crash if we call it on iOS 7
2. The new API won't compile if we build it using the iOS 7 SDK
3. The old API will raise a deprecation warning if built with a deployment target of iOS 8 and up

These three problems require three different technical solutions:

1. We can avoid calling the new API on an old OS version by using runtime detection (e.g. respondsToSelector:)
2. We can avoid compiling new APIs on old SDKs using the __IPHONE_OS_VERSION_MAX_ALLOWED macro

nicklockwood

Hacking UIView animation blocks for fun and profit

In this article, I'm going to explore a way that we can create views that implement custom Core Animation property animations in a natural way.

As we know, layers in iOS come in two flavours: Backing layers and hosted layers. The only difference between them is that the view acts as the layer delegate for its backing layer, but not for any hosted sublayers.

In order to implement the UIView transactional animation blocks, UIView disables all animations by default and then re-enables them individually as required. It does this using the actionForLayer:forKey: method.

Somewhat strangely, UIView doesn't enable animations for every property that CALayer does by default. A notable example is the layer.contents property, which is animatable by default for a hosted layer, but cannot be animated using a UIView animation block.

bmatcuk

How to Symbolize OSX Crash Logs

Unfortunately, xcode does not yet have support for importing OSX crash logs and symbolizing them. Therefore, you must use the command line and a little bit of manual work.

1. Find your dSYM file.
   1. Assuming you are using xcode's archive functionality, open the Organizer window from the Window menu.
   2. Click the Archives tab.
   3. Right click on the appropriate build and select Show in Finder.
   4. When Finder opens, right click on the selected archive and select Show Package Contents.
   5. Navigate to the dSYM directory and copy the appropriate dSYM file to a temporary directory.
2. Then navigate to Products, then Applications, and copy the app file to the same temporary directory.

johan

Step 1

Does your osx terminal speak java 7? Start Terminal.app and try: java -version:

> java -version
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)

wen-long

##ss-redir 的 iptables 配置(透明代理)

透明代理指对客户端透明，客户端不需要进行任何设置就使用了网管设置的代理规则

创建 /etc/ss-redir.json 本地监听 7777 运行ss-redir -v -c /etc/ss-redir.json

iptables -t nat -N SHADOWSOCKS
# 在 nat 表中创建新链
iptables -t nat -A SHADOWSOCKS -p tcp --dport 23596 -j RETURN
# 23596 是 ss 代理服务器的端口，即远程 shadowsocks 服务器提供服务的端口，如果你有多个 ip 可用,但端口一致，就设置这个

gmccreight

" copy all this into a vim buffer, save it, then...
" source the file by typing :so %
" Now the vim buffer acts like a specialized application for mastering vim

" There are two queues, Study and Known.  Depending how confident you feel
" about the item you are currently learning, you can move it down several
" positions, all the way to the end of the Study queue, or to the Known
" queue.

" type ,, (that's comma comma)