Added square cropping sample

SquareCrop/SquareCrop/AppDelegate.h

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+//
+//  AppDelegate.h
+//  SquareCrop
+//
+//  Created by Oliver Drobnik on 22.07.14.
+//  Copyright (c) 2014 Cocoanetics. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface AppDelegate : UIResponder <UIApplicationDelegate>
+
+@end
+

SquareCrop/SquareCrop/AppDelegate.m

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+//
+//  AppDelegate.m
+//  SquareCrop
+//
+//  Created by Oliver Drobnik on 22.07.14.
+//  Copyright (c) 2014 Cocoanetics. All rights reserved.
+//
+
+#import "AppDelegate.h"
+
+@interface AppDelegate ()
+
+@end
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+	// Override point for customization after application launch.
+	return YES;
+}
+
+@end

SquareCrop/SquareCrop/Base.lproj/Main.storyboard

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+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6185.7" systemVersion="13E28" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="vXZ-lx-hvc">
+    <dependencies>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6181.2"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="ufC-wZ-h7g">
+            <objects>
+                <viewController id="vXZ-lx-hvc" customClass="ViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="jyV-Pf-zRb"/>
+                        <viewControllerLayoutGuide type="bottom" id="2fi-mo-0CV"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="kh9-bI-dsS">
+                        <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+                        <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                        <subviews>
+                            <imageView userInteractionEnabled="NO" contentMode="center" horizontalHuggingPriority="251" verticalHuggingPriority="251" translatesAutoresizingMaskIntoConstraints="NO" id="Uaa-Xr-RKf">
+                                <rect key="frame" x="0.0" y="0.0" width="480" height="480"/>
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                        <constraints>
+                            <constraint firstItem="Uaa-Xr-RKf" firstAttribute="leading" secondItem="kh9-bI-dsS" secondAttribute="leading" id="A4t-xg-v52"/>
+                            <constraint firstItem="2fi-mo-0CV" firstAttribute="top" secondItem="Uaa-Xr-RKf" secondAttribute="bottom" id="JOu-zM-mG3"/>
+                            <constraint firstAttribute="trailing" secondItem="Uaa-Xr-RKf" secondAttribute="trailing" id="aiQ-WS-s5A"/>
+                            <constraint firstItem="Uaa-Xr-RKf" firstAttribute="top" secondItem="kh9-bI-dsS" secondAttribute="top" id="i9P-ry-qrc"/>
+                        </constraints>
+                    </view>
+                    <connections>
+                        <outlet property="imageView" destination="Uaa-Xr-RKf" id="g59-9s-QqP"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="x5A-6p-PRh" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

SquareCrop/SquareCrop/Images.xcassets/AppIcon.appiconset/Contents.json

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+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "size" : "29x29",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "40x40",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "iphone",
+      "size" : "60x60",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

SquareCrop/SquareCrop/Images.xcassets/LaunchImage.launchimage/Contents.json

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+{
+  "images" : [
+    {
+      "orientation" : "portrait",
+      "idiom" : "iphone",
+      "extent" : "full-screen",
+      "minimum-system-version" : "7.0",
+      "scale" : "2x"
+    },
+    {
+      "orientation" : "portrait",
+      "idiom" : "iphone",
+      "subtype" : "retina4",
+      "extent" : "full-screen",
+      "minimum-system-version" : "7.0",
+      "scale" : "2x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}

SquareCrop/SquareCrop/Info.plist

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>${EXECUTABLE_NAME}</string>
+	<key>CFBundleIdentifier</key>
+	<string>com.cocoanetics.${PRODUCT_NAME:rfc1034identifier}</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>${PRODUCT_NAME}</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UIRequiredDeviceCapabilities</key>
+	<array>
+		<string>armv7</string>
+	</array>
+</dict>
+</plist>

SquareCrop/SquareCrop/ViewController.h

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+//
+//  ViewController.h
+//  SquareCrop
+//
+//  Created by Oliver Drobnik on 22.07.14.
+//  Copyright (c) 2014 Cocoanetics. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+@interface ViewController : UIViewController
+
+@property (weak, nonatomic) IBOutlet UIImageView *imageView;
+
+@end
+

SquareCrop/SquareCrop/ViewController.m

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+//
+//  ViewController.m
+//  SquareCrop
+//
+//  Created by Oliver Drobnik on 22.07.14.
+//  Copyright (c) 2014 Cocoanetics. All rights reserved.
+//
+
+#import "ViewController.h"
+
+@interface ViewController ()
+
+@end
+
+
+UIImage *squareCropImageToSideLength(UIImage *sourceImage,
+												 CGFloat sideLength)
+{
+	// input size comes from image
+	CGSize inputSize = sourceImage.size;
+
+	// round up side length to avoid fractional output size
+	sideLength = ceilf(sideLength);
+
+	// output size has sideLength for both dimensions
+	CGSize outputSize = CGSizeMake(sideLength, sideLength);
+
+	// calculate scale so that smaller dimension fits sideLength
+	CGFloat scale = MAX(sideLength / inputSize.width,
+							  sideLength / inputSize.height);
+
+	// scaling the image with this scale results in this output size
+	CGSize scaledInputSize = CGSizeMake(inputSize.width * scale,
+													inputSize.height * scale);
+
+	// determine point in center of "canvas"
+	CGPoint center = CGPointMake(outputSize.width/2.0,
+										  outputSize.height/2.0);
+
+	// calculate drawing rect relative to output Size
+	CGRect outputRect = CGRectMake(center.x - scaledInputSize.width/2.0,
+											 center.y - scaledInputSize.height/2.0,
+											 scaledInputSize.width,
+											 scaledInputSize.height);
+
+	// begin a new bitmap context, scale 0 takes display scale
+	UIGraphicsBeginImageContextWithOptions(outputSize, YES, 0);
+
+	// optional: set the interpolation quality.
+	// For this you need to grab the underlying CGContext
+	CGContextRef ctx = UIGraphicsGetCurrentContext();
+	CGContextSetInterpolationQuality(ctx, kCGInterpolationHigh);
+
+	// draw the source image into the calculated rect
+	[sourceImage drawInRect:outputRect];
+
+	// create new image from bitmap context
+	UIImage *outImage = UIGraphicsGetImageFromCurrentImageContext();
+
+	// clean up
+	UIGraphicsEndImageContext();
+
+	// pass back new image
+	return outImage;
+}
+
+
+@implementation ViewController
+
+- (void)viewDidLoad {
+	[super viewDidLoad];
+	// Do any additional setup after loading the view, typically from a nib.
+
+	UIImage *image = [UIImage imageNamed:@"Image.jpg"];
+	UIImage *scaled = squareCropImageToSideLength(image, 300);
+	self.imageView.image = scaled;
+}
+
+@end

SquareCrop/SquareCrop/main.m

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+//
+//  main.m
+//  SquareCrop
+//
+//  Created by Oliver Drobnik on 22.07.14.
+//  Copyright (c) 2014 Cocoanetics. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char * argv[]) {
+	@autoreleasepool {
+	    return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
+	}
+}