图片压缩

来源：互联网发布：爱情电影知乎编辑：程序博客网时间：2024/06/08 09:44

Swift:

  /**    压缩图片的方法，    :param: originalImage 原图    :param: size          指定图片最后的大小    :returns: 压缩后图片    */    class func imageCut(originalImage:UIImage,size:CGSize)->UIImage{        UIGraphicsBeginImageContext(size)        originalImage.drawInRect(CGRectMake(0, 0, size.width, size.height))        let standardImage1 = UIGraphicsGetImageFromCurrentImageContext()        UIGraphicsEndImageContext()        return standardImage1    }

OC:

////  UIImageUtil.m//  Cycling////  Created by LH on 15/11/4.//  Copyright © 2015年 apple. All rights reserved.//#import "UIImageUtil.h"@implementation UIImageUtil//修改图片大小和控件一致+(UIImage *)scaleImageToSize:(UIImage *)img size:(CGSize)size {    // 绘制改变大小的图片    UIGraphicsBeginImageContextWithOptions(size, NO, 2.0);    [img 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;}+ (UIImage *)scaleImageToSize:(UIImage *)img scale:(CGFloat)scale{    CGSize size=img.size;    UIGraphicsBeginImageContextWithOptions(size, NO, 2.0);    [img drawInRect:CGRectMake(0, 0, size.width*scale, size.height*scale)];    // 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;}/** *  @author lH * *  裁剪一定区域的图片 * *  @param cutView 指定的图片 * *  @return 裁剪后的图片 */    +(UIImage *)cutViewWithView:(UIView *)cutView{    //    UIWindow *screenWindow = [[UIApplication sharedApplication] keyWindow];//    UIGraphicsBeginImageContext(cutView.frame.size);//全屏截图，包括window    UIGraphicsBeginImageContextWithOptions(cutView.frame.size, NO, [UIScreen mainScreen].scale);    [cutView.layer renderInContext:UIGraphicsGetCurrentContext()];    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();//        UIImageWriteToSavedPhotosAlbum(viewImage, nil, nil, nil);    return viewImage;}/** *  等比缩放图片裁剪指定区域图片 * *  @param image 原图 *  @param size  裁剪范围 * *  @return 裁剪后的图片 */+(UIImage *)compressImageWith:(UIImage *)image scaleToSize:(CGSize)size{    // 原图宽    CGFloat imageWidth = image.size.width;    // 原图高    CGFloat imageHeight = image.size.height;    // 缩放比例    CGFloat widthScale = imageWidth /size.width;    CGFloat heightScale = imageHeight /size.height;    // 创建一个bitmap的context    // 并把它设置成为当前正在使用的context    UIGraphicsBeginImageContext(CGSizeMake(size.width, size.height));    // 横屏图片    if (widthScale > heightScale) {        [image drawInRect:CGRectMake(0, 0, imageWidth /heightScale , size.height)];    }    else { // 竖屏图片        [image drawInRect:CGRectMake(0, 0, size.width , imageHeight /widthScale)];    }    // 从当前context中创建一个改变大小后的图片    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    // 使当前的context出堆栈    UIGraphicsEndImageContext();    return newImage;}@end

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