iOS 指定压缩大小(UIImage扩张)--Swift/OC版

来源：互联网发布：未来的大数据编辑：程序博客网时间：2024/05/16 17:03

UIImageExtension.swift

////  UIImageExtension.swift//  GongFuBaoSwift////  Created by GongHui_YJ on 16/8/12.//  Copyright © 2016年 杨建. All rights reserved.////                            _ooOoo_//                           o8888888o//                           88" . "88//                           (| -_- |)//                            O\ = /O//                        ____/`---'\____//                      .   ' \\| |// `.//                       / \\||| : |||// \//                     / _||||| -:- |||||- \//                       | | \\\ - /// | |//                     | \_| ''\---/'' | |//                      \ .-\__ `-` ___/-. ///                   ___`. .' /--.--\ `. . __//                ."" '< `.___\_<|>_/___.' >'"".//               | | : `- \`.;`\ _ /`;.`/ - ` : | |//                 \ \ `-. \_ __\ /__ _/ .-` / ///         ======`-.____`-.___\_____/___.-`____.-'======//                            `=---='////         .............................................//                  佛祖保佑             永无BUG//          佛曰://                  写字楼里写字间，写字间里程序员；//                  程序人员写程序，又拿程序换酒钱。//                  酒醒只在网上坐，酒醉还来网下眠；//                  酒醉酒醒日复日，网上网下年复年。//                  但愿老死电脑间，不愿鞠躬老板前；//                  奔驰宝马贵者趣，公交自行程序员。//                  别人笑我忒疯癫，我笑自己命太贱；//                  不见满街漂亮妹，哪个归得程序员？import Foundationextension UIImage {    ///对指定图片进行拉伸    func resizableImage(name: String) -> UIImage {        var normal = UIImage(named: name)!        let imageWidth = normal.size.width * 0.5        let imageHeight = normal.size.height * 0.5        normal = resizableImageWithCapInsets(UIEdgeInsetsMake(imageHeight, imageWidth, imageHeight, imageWidth))        return normal    }    /**     *  压缩上传图片到指定字节     *     *  image     压缩的图片     *  maxLength 压缩后最大字节大小     *     *  return 压缩后图片的二进制     */     class func compressImage(image: UIImage, maxLength: Int) -> NSData? {        let newSize = self.scaleImage(image, imageLength: 300)        let newImage = self.resizeImage(image, newSize: newSize)        var compress:CGFloat = 0.9        var data = UIImageJPEGRepresentation(newImage, compress)        while data?.length > maxLength && compress > 0.01 {            compress -= 0.02            data = UIImageJPEGRepresentation(newImage, compress)        }        return data    }    /**     *  通过指定图片最长边，获得等比例的图片size     *     *  image       原始图片     *  imageLength 图片允许的最长宽度（高度）     *     *  return 获得等比例的size     */    class func scaleImage(image: UIImage, imageLength: CGFloat) -> CGSize {        var newWidth:CGFloat = 0.0        var newHeight:CGFloat = 0.0        let width = image.size.width        let height = image.size.height        if (width > imageLength || height > imageLength){            if (width > height) {                newWidth = imageLength;                newHeight = newWidth * height / width;            }else if(height > width){                newHeight = imageLength;                newWidth = newHeight * width / height;            }else{                newWidth = imageLength;                newHeight = imageLength;            }        }        return CGSize(width: newWidth, height: newHeight)    }    /**     *  获得指定size的图片     *     *  image   原始图片     *  newSize 指定的size     *     *  return 调整后的图片     */    class func resizeImage(image: UIImage, newSize: CGSize) -> UIImage {        UIGraphicsBeginImageContext(newSize)        image.drawInRect(CGRect(x: 0, y: 0, width: newSize.width, height: newSize.height))        let newImage = UIGraphicsGetImageFromCurrentImageContext()        UIGraphicsEndImageContext()        return newImage    }}

OC版

/** *  图片压缩 */- (NSData *)resetSizeOfImageData:(UIImage *)source_image maxSize:(NSInteger)maxSize{    //先调整分辨率    CGSize newSize = CGSizeMake(source_image.size.width, source_image.size.height);    CGFloat tempHeight = newSize.height / 1024;    CGFloat tempWidth = newSize.width / 1024;    if (tempWidth > 1.0 && tempWidth > tempHeight) {        newSize = CGSizeMake(source_image.size.width / tempWidth, source_image.size.height / tempWidth);    }    else if (tempHeight > 1.0 && tempWidth < tempHeight){        newSize = CGSizeMake(source_image.size.width / tempHeight, source_image.size.height / tempHeight);    }    UIGraphicsBeginImageContext(newSize);    [source_image drawInRect:CGRectMake(0,0,newSize.width,newSize.height)];    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();    UIGraphicsEndImageContext();    //调整大小    NSData *imageData = UIImageJPEGRepresentation(newImage,1.0);    NSUInteger sizeOrigin = [imageData length];    NSUInteger sizeOriginKB = sizeOrigin / 1024;    if (sizeOriginKB > maxSize) {        NSData *finallImageData = UIImageJPEGRepresentation(newImage,0.50);                return finallImageData;    }    return imageData;}

0 0