JeOam

Author: https://www.cyanhall.com/

1. The Layer Tree

Core Animation's original name is Layer Kit

Core Animation is a compositing engine; its job is to compose different pieces of visual content on the screen, and to do so as fast as possible. The content in question is divided into individual layers stored in a hierarchy known as the layer tree. This tree forms the underpinning for all of UIKit, and for everything that you see on the screen in an iOS application.

In UIView, tasks such as rendering, layout and animation are all managed by a Core Animation class called CALayer. The only major feature of UIView that isn’t handled by CALayer is user interaction.

There are four hierarchies, each performing a different role:

jspahrsummers

/// Observes a run loop to detect any stalling or blocking that occurs.
///
/// This class is thread-safe.
@interface GHRunLoopWatchdog : NSObject

/// Initializes the receiver to watch the specified run loop, using a default
/// stalling threshold.
- (id)initWithRunLoop:(CFRunLoopRef)runLoop;

/// Initializes the receiver to detect when the specified run loop blocks for

ffried

extension UIImage {
    public func imageRotatedByDegrees(degrees: CGFloat) -> UIImage {
        let radiansToDegrees: (CGFloat) -> CGFloat = {
            return $0 * (180.0 / CGFloat(M_PI))
        }
        let degreesToRadians: (CGFloat) -> CGFloat = {
            return $0 / (180.0 * CGFloat(M_PI))
        }
        
        // calculate the size of the rotated view's containing box for our drawing space

LeCoupa

#!/bin/bash
#####################################################
# Name: Bash CheatSheet for Mac OSX
# 
# A little overlook of the Bash basics
#
# Usage:
#
# Author: J. Le Coupanec
# Date: 2014/11/04

yimingtang

//
//  UIViewController+Topmost.h
//
//  Created by Yiming Tang on 13-10-14.
//  Copyright (c) 2013 Yiming Tang. All rights reserved.
//

@interface UIViewController (Topmost)

+ (UIViewController *)topmostViewController;

soffes

//
//  SHRZebraView.h
//  Shares
//
//  Created by Sam Soffes on 9/19/13.
//  Copyright (c) 2013 Nothing Magical. All rights reserved.
//

@interface SHRZebraView : UIView
@end

timdream

Github 發 Pull Request & 貢獻流程速查

前言

此文目標讀者需先自行學會

• 開 Github 帳號
• 會 fork 程式 repository
• 會在自己的電腦使用命令列 git
• 會 clone 自己的 repository

mattt

Generate the list yourself:

$ cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS*.sdk/System/Library/Frameworks/UIKit.framework/Headers
$ grep UI_APPEARANCE_SELECTOR ./*     | \
  sed 's/NS_AVAILABLE_IOS(.*)//g'     | \
  sed 's/NS_DEPRECATED_IOS(.*)//g'    | \
  sed 's/API_AVAILABLE(.*)//g'        | \
  sed 's/API_UNAVAILABLE(.*)//g'      | \
 sed 's/UI_APPEARANCE_SELECTOR//g' | \

jder

// For details, see http://mindsea.com/2012/12/18/downscaling-huge-alassets-without-fear-of-sigkill

#import <AssetsLibrary/AssetsLibrary.h>
#import <ImageIO/ImageIO.h>

// Helper methods for thumbnailForAsset:maxPixelSize:
static size_t getAssetBytesCallback(void *info, void *buffer, off_t position, size_t count) {
    ALAssetRepresentation *rep = (__bridge id)info;
    
    NSError *error = nil;

kreeger

In writing my first iOS app, I found myself reaching out in a few areas of self-discovery regarding the Cocoa Touch framework and what it's capable of, especially in how it compares to Ruby and it's standard library (which is what I've been used to for the past few years of my life). I've grown to love Ruby mixins and monkey-patching, and was delighted to learn that Objective-C has something quite similar: categories. ClassName+CategoryName.{h,m} is all you need, and you can define new class/static and instance methods on an Objective-C class.

One of my other strong preferences is for the Markdown format, and thus I snagged one of the more popular C-based implementations of Markdown (named [Sundown][sun]) and wrote a category around UIWebView for effortlessly displaying a parsed file. This was all made possible in the first place by [an awesome post on Stack Overflow][sta] on using Sundown with Objective-C.

//
//  UIWebView+Markdown.h
//

#import <UIKit/UIKit.h>