iphone 缩放图片

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UIImage 图片缩放  

编辑文档

#import <Foundation/Foundation.h>


@interface UIImage (scale)

-(UIImage*)scaleToSize:(CGSize)size;

@end

 

//
//  UIImageScale.m
//  golfChina
//
//  Created by chao.wang on 6/1/10.
//  Copyright 2010 __MyCompanyName__. All rights reserved.
//

#import "UIImageScale.h"



@implementation UIImage (scale)

-(UIImage*)scaleToSize:(CGSize)size
{
    // 创建一个bitmap的context
    // 并把它设置成为当前正在使用的context
    UIGraphicsBeginImageContext(size);

    // 绘制改变大小的图片
    [self drawInRect:CGRectMake(0, 0, size.width, size.height)];

    // 从当前context中创建一个改变大小后的图片
    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    // 使当前的context出堆栈
    UIGraphicsEndImageContext();

    // 返回新的改变大小后的图片
    return scaledImage;
}

@end

 

 

调用：

CGSize imageSize = CGSizeMake(imageWidth, imageHeigh) ;

    holeImage = [holeImage scaleToSize:imageSize];

    CGRect imageframe = CGRectMake(0, 85, holeImage.size.width, holeImage.size.height);


    [holeImage drawInRect:imageframe ];