//

//  UIImage+UIImageExt.m
//  MyHomeBuy
//
//  Created by first on 13-9-13.
//  Copyright (c) 2013年 MyCompanyName. All rights reserved.
//
import "UIImage+UIImageExt.h"
@implementation UIImage (UIImageExt)

(UIImage*)imageByScalingAndCroppingForSize:(CGSize)targetSize;

{

UIImage *sourceImage = self;

UIImage *newImage = nil;

CGSize imageSize = sourceImage.size;

CGFloat width = imageSize.width;

CGFloat height = imageSize.height;

CGFloat targetWidth = targetSize.width;

CGFloat targetHeight = targetSize.height;

CGFloat scaleFactor = 0.0;

CGFloat scaledWidth = targetWidth;

CGFloat scaledHeight = targetHeight;

CGPoint thumbnailPoint = CGPointMake(0.0,0.0);

if (CGSizeEqualToSize(imageSize, targetSize) == NO)

{

    CGFloat widthFactor = targetWidth / width;

    CGFloat heightFactor = targetHeight / height;

    if (widthFactor > heightFactor)

        scaleFactor = widthFactor; // scale to fit height

    else

        scaleFactor = heightFactor; // scale to fit width

    scaledWidth= width * scaleFactor;

    scaledHeight = height * scaleFactor;

    // center the image

    if (widthFactor > heightFactor)

    {

        thumbnailPoint.y = (targetHeight - scaledHeight) * 0.5;

    }

    else if (widthFactor < heightFactor)

    {

        thumbnailPoint.x = (targetWidth - scaledWidth) * 0.5;

    }

}

UIGraphicsBeginImageContext(targetSize); // this will crop

CGRect thumbnailRect = CGRectZero;

thumbnailRect.origin = thumbnailPoint;

thumbnailRect.size.width= scaledWidth;

thumbnailRect.size.height = scaledHeight;

[sourceImage drawInRect:thumbnailRect];

newImage = UIGraphicsGetImageFromCurrentImageContext();

//if(newImage == nil)

//NSLog(@"could not scale image");

//pop the context to get back to the default

UIGraphicsEndImageContext();

return newImage;


}
@end
//
//  UIImage+UIImageExt.h
//  MyHomeBuy
//
//  Created by first on 13-9-13.
//  Copyright (c) 2013年 MyCompanyName. All rights reserved.
//
import <UIKit/UIKit.h>
@interface UIImage (UIImageExt)

(UIImage*)imageByScalingAndCroppingForSize:(CGSize)targetSize;

@end</pre>