iOS自动生成图片@1x，@2x ，@3x图片

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下载地址：

https://github.com/odot/AutoGenerateSuitImage

核心类

////  UIImage+AutoResize.h//  CommonToolLib////  Created by to2dot@qq.com on 15/2/2.//  Copyright (c) 2015年 todot. All rights reserved.//#import <UIKit/UIKit.h>/* *待缩放的图片 原始大小 * DOTOriginImageType3x imageName@3x.png大小图片 默认 * DOTOriginImageType2x imageName@2x.png大小图片 * DOTOriginImageType1x imageName.png大小图片 */typedef NS_ENUM(NSInteger, DOTOriginImageType) {    DOTOriginImageType3x    = 0,    DOTOriginImageType2x    = 1,    DOTOriginImageType1x    = 2};@interface UIImage(AutoResize)+ (void)generateSuitImagesWithOriginImagePath:(NSString*)originPath                                 newImagePath:(NSString*)newPath;+ (void)generateSuitImagesWithOriginImagePath:(NSString*)originPath                                 newImagePath:(NSString*)newPath                              originImageType:(DOTOriginImageType)originImageType;/* * 提供一套图片 自动生成多套图片 （如美工只提供了一套@3x图片，调用此函数自动生成@2x和最小倍率的图片） * * @param originPath        原始图片的路径 * @param newPath           生成后的图片路径，可以为nil，为nil则生成后的图片自动保存在 originPath/newImages 下 * @param originImageType   原始图片类型（@3x、@2x、@1x，当然@1x后缀是不存在的） * @param autoEnLarge       是否自动放大（当提供的图片类型不是@3x时，enLarge=YES会自动生成@3x类型的图片） * * @return void */+ (void)generateSuitImagesWithOriginImagePath:(NSString*)originPath                                 newImagePath:(NSString*)newPath                              originImageType:(DOTOriginImageType)originImageType                     autoGenerateEnLargeImage:(BOOL)enLarge;@end

.m文件

////  UIImage+AutoResize.m//  CommonToolLib////  Created by to2dot@qq.com on 15/2/2.//  Copyright (c) 2015年 todot. All rights reserved.//#import "UIImage+AutoResize.h"@implementation UIImage(AutoResize)// 创建目录+ (BOOL)createDirectory:(NSString*)directory{    NSError* error = nil;    BOOL isCreatDirSucc = [[NSFileManager defaultManager] createDirectoryAtPath:directory withIntermediateDirectories:YES attributes:nil error:&error];    if (!isCreatDirSucc && !error) {        NSLog(@"创建%@目录失败：%@", directory, error);        return NO;    } else {        NSLog(@"创建%@目录成功", directory);        return YES;    }}// 检测目录是否存在+ (BOOL)isDirectoryExist:(NSString*)directory{    BOOL isDir = NO;        // 如果目录不存在则创建目录    BOOL isDirExist = [[NSFileManager defaultManager] fileExistsAtPath:directory isDirectory:&isDir];    if (!isDirExist && !isDir) {        if ([self createDirectory:directory] == NO) {            return NO;        }    }    isDirExist = [[NSFileManager defaultManager] fileExistsAtPath:directory];        return isDirExist;}+ (UIImage*)originImage:(UIImage *)image 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    [image 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;}// 按照倍数缩放+ (UIImage*)originImage:(UIImage *)image scaleWithMultiple:(CGFloat)multiple{    CGSize size = image.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    [image drawInRect:CGRectMake(0, 0, size.width * multiple, size.height * multiple)];        // 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;}+ (void)generateSuitImagesWithOriginImagePath:(NSString*)originPath                                 newImagePath:(NSString*)newPath{    [self generateSuitImagesWithOriginImagePath:originPath newImagePath:newPath originImageType:DOTOriginImageType3x autoGenerateEnLargeImage:NO];}+ (void)generateSuitImagesWithOriginImagePath:(NSString*)originPath                                 newImagePath:(NSString*)newPath                              originImageType:(DOTOriginImageType)originImageType{    [self generateSuitImagesWithOriginImagePath:originPath newImagePath:newPath originImageType:originImageType autoGenerateEnLargeImage:NO];}/* * 提供一套图片 自动生成多套图片 （如美工只提供了一套@3x图片，调用此函数自动生成@2x和最小倍率的图片） * * @param originPath        原始图片的路径 * @param newPath           生成后的图片路径，可以为nil，为nil则生成后的图片自动保存在 originPath/newImages 下 * @param originImageType   原始图片类型（@3x、@2x、@1x，当然@1x后缀是不存在的） * @param autoEnLarge       是否自动放大（当提供的图片类型不是@3x时，enLarge=YES会自动生成@3x类型的图片） * * @return void */+ (void)generateSuitImagesWithOriginImagePath:(NSString*)originPath                                 newImagePath:(NSString*)newPath                              originImageType:(DOTOriginImageType)originImageType                     autoGenerateEnLargeImage:(BOOL)enLarge{    NSFileManager* fileManager = [NSFileManager defaultManager];    NSLog(@"------   %@    ------",fileManager.currentDirectoryPath);    BOOL isDir = NO;    BOOL isDirExist = [fileManager fileExistsAtPath:originPath isDirectory:&isDir];    if (isDir == NO || isDirExist == NO) {        NSLog(@"%@ %@不存在", NSStringFromClass([self class]), originPath);        return;    }        NSString* newImagePath = [NSString stringWithFormat:@"%@", newPath];        if (newPath == nil || newPath.length == 0) {        newImagePath = [originPath stringByAppendingPathComponent:@"newImages"];    }        // 判读目录是否存在 不存在则创建    if ([self isDirectoryExist:newImagePath] == NO) {        NSLog(@"%@ %@不存", NSStringFromClass([self class]), newImagePath);        return;    }        NSString* tmpImagePath = [newImagePath stringByAppendingPathComponent:@"tmp"];    if ([self isDirectoryExist:tmpImagePath] == NO) {        NSLog(@"%@ 创建临时目录[%@]失败", NSStringFromClass([self class]), tmpImagePath);        return;    }       // 遍历目录下的文件    NSDirectoryEnumerator* direnum = [fileManager enumeratorAtPath:originPath];    NSMutableArray *files = [NSMutableArray array];    NSString *filename ;    while (filename = [direnum nextObject]) {        if ([[filename pathExtension] isEqualToString:@"png"]) {            [files addObject: filename];        }    }        NSLog(@"%@ %@", NSStringFromClass([self class]), files);        for (NSString* filename in files) {        NSString* prefix = [[filename componentsSeparatedByString:@"."] objectAtIndex:0];                        NSString* filePrefix = [NSString stringWithString:prefix];        NSRange range = [prefix rangeOfString:@"@"];        if (range.length != 0) {            //如果包含@符号 剔除 @3x, @2x等字符            filePrefix = [[prefix componentsSeparatedByString:@"@"] objectAtIndex:0];        }                        // 临时目录        NSString* oldPath = [originPath stringByAppendingPathComponent:filename];        NSString* tmpNewImagePath = [[tmpImagePath stringByAppendingPathComponent:filePrefix] stringByAppendingPathExtension:@"png"];                NSString* bigPath = [[newImagePath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@@3x", filePrefix]] stringByAppendingPathExtension:@"png"];        NSString* middlePath = [[newImagePath stringByAppendingPathComponent:[NSString stringWithFormat:@"%@@2x", filePrefix]] stringByAppendingPathExtension:@"png"];        NSString* smallPath = [[newImagePath stringByAppendingPathComponent:filePrefix] stringByAppendingPathExtension:@"png"];        /*         必须先将 图片名中包含@3x/@2x的图片移动并重命名为没有@3x/@2x的图片（如果不重命名，会导致计算加载正确的图片），然后再缩放                  涉及到UIImage加载行为         */        NSError* error = nil;                BOOL copySucc = [[NSFileManager defaultManager] copyItemAtPath:oldPath toPath:tmpNewImagePath error:&error];        if (copySucc && error == nil) {            if (originImageType == DOTOriginImageType3x) {                [self saveResizedImageWithOriginPath:tmpNewImagePath toNewPath:bigPath WithMultiple:1.0];                [self saveResizedImageWithOriginPath:tmpNewImagePath toNewPath:middlePath WithMultiple:0.667];                [self saveResizedImageWithOriginPath:tmpNewImagePath toNewPath:smallPath WithMultiple:0.334];                            } else if (originImageType ==DOTOriginImageType2x) {                [self saveResizedImageWithOriginPath:tmpNewImagePath toNewPath:middlePath WithMultiple:1.0];                [self saveResizedImageWithOriginPath:tmpNewImagePath toNewPath:smallPath WithMultiple:0.5];                if (enLarge == YES) {                    [self saveResizedImageWithOriginPath:tmpNewImagePath toNewPath:bigPath WithMultiple:1.5];                }                            } else if (originImageType == DOTOriginImageType1x) {                [self saveResizedImageWithOriginPath:tmpNewImagePath toNewPath:smallPath WithMultiple:1.0];                                if (enLarge == YES) {                    [self saveResizedImageWithOriginPath:tmpNewImagePath toNewPath:middlePath WithMultiple:2.0];                    [self saveResizedImageWithOriginPath:tmpNewImagePath toNewPath:bigPath WithMultiple:3.0];                }            }        }    }}+ (BOOL)saveResizedImageWithOriginPath:(NSString*)originPath toNewPath:(NSString*)newPath WithMultiple:(CGFloat)multiple{    UIImage* originImage = [UIImage imageNamed:originPath];        CGSize newSize = CGSizeMake(originImage.size.width * multiple, originImage.size.height * multiple);    UIImage* newImage = [self originImage:originImage scaleToSize:newSize];        BOOL scaleSucc = [UIImagePNGRepresentation(newImage) writeToFile:newPath atomically:YES];    if (scaleSucc == YES) {        NSLog(@"%lf:%@---->%@成功", multiple, originPath, newPath);    }    return scaleSucc;}@end

调用方法如下

/Users/hebiao/Desktop/cut3x  这个是新建的在桌面的一个文件夹，将需要转换的图片放在这个文件夹中

  [UIImage generateSuitImagesWithOriginImagePath:@"/Users/hebiao/Desktop/cut3x" newImagePath:nil originImageType:DOTOriginImageType3x autoGenerateEnLargeImage:NO];           // 如果提供的切图是@2x的图片 autoGenerateEnLargeImage＝YES 会自动生成其对应的@3x图片    [UIImage generateSuitImagesWithOriginImagePath:@"/Users/<span style="font-family: Arial, Helvetica, sans-serif;">hebiao</span><span style="font-family: Arial, Helvetica, sans-serif;">/Desktop/cut2x" newImagePath:nil originImageType:DOTOriginImageType2x autoGenerateEnLargeImage:YES];</span>     /*    // 如果提供的切图是最小倍率的图片 autoGenerateEnLargeImage＝YES 会自动生成其对应的@3x和@2x图片（图片效果不佳）    [UIImage generateSuitImagesWithOriginImagePath:@"/Users/<span style="font-family: Arial, Helvetica, sans-serif;">hebiao</span><span style="font-family: Arial, Helvetica, sans-serif;">/Desktop/cut2x" newImagePath:nil originImageType:DOTOriginImageType1x autoGenerateEnLargeImage:YES];</span>     */

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