Image cropping with resizing

UIImage(MICropping).m

//
//  UIImage+MICropping.m
//  Mustafa Ibrahim
//
//  Created by Mustafa Ibrahim on 2/4/14.
//  Copyright (c) 2014 Mustafa Ibrahim. All rights reserved.
//

#import "UIImage+MICropping.h"

@implementation UIImage (MICropping)

- (UIImage *)squareImagescaledToSize:(CGSize)newSize
{
    double ratio;
    double delta;
    CGPoint offset;
    
    //make a new square size, that is the resized imaged width
    CGSize sz = CGSizeMake(newSize.width, newSize.width);
    
    //figure out if the picture is landscape or portrait, then
    //calculate scale factor and offset
    if (self.size.width > self.size.height) {
        ratio = newSize.width / self.size.width;
        delta = (ratio*self.size.width - ratio*self.size.height);
        offset = CGPointMake(delta/2, 0);
    } else {
        ratio = newSize.width / self.size.height;
        delta = (ratio*self.size.height - ratio*self.size.width);
        offset = CGPointMake(0, delta/2);
    }
    
    //make the final clipping rect based on the calculated values
    CGRect clipRect = CGRectMake(-offset.x, -offset.y,
                                 (ratio * self.size.width) + delta,
                                 (ratio * self.size.height) + delta);
    
    
    //start a new context, with scale factor 0.0 so retina displays get
    //high quality image
    if ([[UIScreen mainScreen] respondsToSelector:@selector(scale)]) {
        UIGraphicsBeginImageContextWithOptions(sz, YES, 0.0);
    } else {
        UIGraphicsBeginImageContext(sz);
    }
    UIRectClip(clipRect);
    [self drawInRect:clipRect];
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return newImage;
}

@end

UIImage+MICropping.h

//
//  UIImage+MICropping.h
//  Mustafa Ibrahim
//
//  Created by Mustafa Ibrahim on 2/4/14.
//  Copyright (c) 2014 Mustafa Ibrahim. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface UIImage (MICropping)

- (UIImage *)squareImagescaledToSize:(CGSize)newSize;

@end