odrobnik

- (void)addShadowWithColor:(UIColor *)color alpha:(CGFloat)alpha radius:(CGFloat)radius offset:(CGSize)offset
{
	self.layer.shadowOpacity = alpha;
	self.layer.shadowRadius = radius;
	self.layer.shadowOffset = offset;
	
	if (color)
	{
		self.layer.shadowColor = [color CGColor];
	}

adamawolf

i386 : iPhone Simulator
x86_64 : iPhone Simulator
arm64 : iPhone Simulator
iPhone1,1 : iPhone
iPhone1,2 : iPhone 3G
iPhone2,1 : iPhone 3GS
iPhone3,1 : iPhone 4
iPhone3,2 : iPhone 4 GSM Rev A
iPhone3,3 : iPhone 4 CDMA
iPhone4,1 : iPhone 4S

lesleh

import android.content.Context;
import android.graphics.Matrix;
import android.util.AttributeSet;
import android.widget.ImageView;

/**
 * ImageView that scales like centerCrop, but instead of showing the centre of the image, it shows the top.
 */
public class TopCropImageView extends ImageView {
    public TopCropImageView(Context context) {

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

kientux

/**
 * Created by kientux on 3/20/15
 */

import android.util.Base64;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Arrays;

Sorix

//  Created by Vasily Ulianov on 09.02.17, updated in 2019.
//  License: MIT

import Foundation

/// Subclass of `Operation` that adds support of asynchronous operations.
/// 1. Call `super.main()` when override `main` method.
/// 2. When operation is finished or cancelled set `state = .finished` or `finish()`
open class AsynchronousOperation: Operation {
    public override var isAsynchronous: Bool {

vinhnx

Centered Paging with Preview Cells on UICollectionView

The proposed offset is where the collection view would stop without our intervention. We peek into this area by finding its centre as proposedContentOffsetCenterX and examine our currently visible cells to see which one’s centre is closer to the centre of that area.

import UIKit
 
class CenterCellCollectionViewFlowLayout: UICollectionViewFlowLayout {
    
    var mostRecentOffset : CGPoint = CGPoint()

lattner

Swift Concurrency Manifesto

Author: Chris Lattner

Chinese Translation by Jason Yu

Contents

• Introduction
• Overall Vision

SheldonWangRJT

iOS Create a Carthage Supported Framework

#iOSBySheldon
A little bit Background of Carthage:
- Carthage works like Cocoapods, but a little bit simpler. 
	* When creating a Cocoapods supported framework need a .podspec file to do some config, which is not required by Carthage.
	* When using a Cocoapods supported framework, a workspace file will be automatically created, the umbrella header will be setup in a pod project inside workspace. It feels simple, but the whole process creates a lot files including a "giant" workspace.
	* When using a Carthage supported framework, it will just download the framework, and its dependencies if any, to a folder. All we need to do is to drag and drop it to the binary linking section in the project build setting tab, for the first time. It sounds complicated but it makes the project clean.
- Carthage is written in Swift. 
- Carthage internally uses `-xcodebuild` to build dependency.

htinlinn

extension JSONDecoder {

    func decode<T: Decodable>(_ type: T.Type, from data: Data, keyedBy key: String?) throws -> T {
        if let key = key {
            // Pass the top level key to the decoder.
            userInfo[.jsonDecoderRootKeyName] = key

            let root = try decode(DecodableRoot<T>.self, from: data)
            return root.value
        } else {