gabrielfalcao

0 = Success
1 = Operation not permitted
2 = No such file or directory
3 = No such process
4 = Interrupted system call
5 = Input/output error
6 = No such device or address
7 = Argument list too long
8 = Exec format error

niw

/*
 * A simple libpng example program
 * http://zarb.org/~gc/html/libpng.html
 *
 * Modified by Yoshimasa Niwa to make it much simpler
 * and support all defined color_type.
 *
 * To build, use the next instruction on OS X.
 * $ brew install libpng
 * $ clang -lz -lpng16 libpng_test.c

kirsteins

var initalArray = [1, 2, 3]
let pointer: UnsafeMutablePointer<Int> = UnsafeMutablePointer(initalArray)
let arrary = Array(UnsafeBufferPointer(start: pointer, count: initalArray.count))

elbeno

#include <functional>
#include <iostream>
using namespace std;

template <typename F>
struct Y
{
  Y(F f) : m_f(f) {}

  template <typename T>

loganwright

import Foundation

extension Dictionary {
    mutating public func setValue(val: AnyObject, forKeyPath keyPath: String) {
        var keys = keyPath.componentsSeparatedByString(".")
        guard let first = keys.first as? Key else { print("Unable to use string as key on type: \(Key.self)"); return }
        keys.removeAtIndex(0)
        if keys.isEmpty, let settable = val as? Value {
            self[first] = settable
        } else {

wxdao

#include <netinet/in.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/kern_control.h>
#include <net/if_utun.h>
#include <sys/ioctl.h>
#include <sys/kern_event.h>

int open_utun(int num) {
	int err;

endavid

public class FontAtlas: NSObject, NSSecureCoding {
    public static var supportsSecureCoding: Bool { get { return true } }

    static let atlasSize: Int = 2048 // 4096 runs out of mem...
    var glyphs : [GlyphDescriptor] = []
    let parentFont: UIFont
    var fontPointSize: CGFloat
    let textureSize: Int
    var textureData: [UInt8] = []
  

tclementdev

libdispatch efficiency tips

The libdispatch is one of the most misused API due to the way it was presented to us when it was introduced and for many years after that, and due to the confusing documentation and API. This page is a compilation of important things to know if you're going to use this library. Many references are available at the end of this document pointing to comments from Apple's very own libdispatch maintainer (Pierre Habouzit).

My take-aways are:

• You should create very few, long-lived, well-defined queues. These queues should be seen as execution contexts in your program (gui, background work, ...) that benefit from executing in parallel. An important thing to note is that if these queues are all active at once, you will get as many threads running. In most apps, you probably do not need to create more than 3 or 4 queues.

• Go serial first, and as you find performance bottle necks, measure why, and if concurrency helps, apply with care, always validating under system pressure. Reuse

kemchenj

import UIKit

class CodeTextField: UITextField, UITextFieldDelegate {

    let codeLength: Int
    var characterSize: CGSize
    var characterSpacing: CGFloat
    let textPreprocess: (String) -> String
    let validCharacterSet: CharacterSet

huangboju

基础知识

runtime源码

Runloop源码

dyld源码

Swift各个版本变化

iOS 底层原理 + 逆向 文章汇总

• Advancements in the Objective-C Runtime