iOS自动生成图片@1x，@2x ，@3x图片
下载地址 ：
https://github.com/odot/AutoGenerateSuitImage
核心类
//
// UIImage+AutoResize.h
// CommonToolLib
//
// Created by [email protected] on 15/2/2.
// Copyright (c) 2015年 todot. All rights reserved.
//
#import
/*
*待缩放的图片 原始大小
* DOTOriginImageType3x [email protected]大小图片 默认
* DOTOriginImageType2x [email protected]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 [email protected] 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/hebiao/Desktop/cut2x" newImagePath:nil originImageType:DOTOriginImageType2x autoGenerateEnLargeImage:YES];
/*
// 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/hebiao/Desktop/cut2x" newImagePath:nil originImageType:DOTOriginImageType1x autoGenerateEnLargeImage:YES];
*/