iOS 沙盒图片的存取

简介：

图片的沙盒读存操作主要是增、删、查，一般不涉及改的操作，这里直接以代码演示

常用代码：

1. 增

    /**
     *  存储缩略图到沙盒中
     */
    + (BOOL)saveImageToPath:(NSString *)imageFilePath image:(UIImage *)image{
        return [UIImageJPEGRepresentation(image, 0.5) writeToFile:imageFilePath  atomically:YES];
    }

2. 删

    /**
     *  删除沙盒里的缩略图
     */
    + (void)deleteImageWithPath:(NSString *)thumbnailPath{
        BOOL isHave = [[NSFileManager defaultManager] fileExistsAtPath:thumbnailPath];
   
        if (!isHave) {
            NSLog(@"no  have");
            return ;
        }else {
            NSError *error;
            BOOL isDeleteFinish = [[NSFileManager defaultManager] removeItemAtPath:thumbnailPath error:&error];
    
            if (!isDeleteFinish) {
                NSLog(@"delete fail --- %@", error);
            }
        }
    }

3. 查

    UIImage *image = [UIImage imageWithContentsOfFile:thumbnailPath];

4. 获取缩略图路径

    /**
     *  获取缩略图的路径
     */
    + (NSString *)getFilePath{
        NSString *libPath = [NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES) lastObject];
        NSString *thumbnailPath = [NSString stringWithFormat:@"%@/Caches/AR/ARThumbnail", libPath];
        NSFileManager *fileManager = [NSFileManager defaultManager];
        if (![fileManager fileExistsAtPath:thumbnailPath]) {
            NSError *error;
            [fileManager createDirectoryAtPath:thumbnailPath withIntermediateDirectories:YES attributes:nil error:&error];
            if (error) {
                NSLog(@"error");
                return nil;
            }
        }        
        return thumbnailPath;
    }

5. 获取沙盒根目录

   //获取沙盒根目录

   NSString *directory = NSHomeDirectory();

   NSLog(@"directory:%@", directory);

6. 获取Document路径

   //获取Documents路径

   NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

   NSString *path = [paths objectAtIndex:0];

   NSLog(@"path:%@", path);

7. 获取Library路径

     //获取Library路径
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory, NSUserDomainMask, YES);
     NSString *path = [paths objectAtIndex:0];
     NSLog(@"path：%@", path);

8. 获取tmp路径

     NSString *tmp = NSTemporaryDirectory();
     NSLog(@"tmp：%@", tmp);

9. 获取Caches路径

     //获取Caches路径
     NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
     NSString *path = [paths objectAtIndex:0];
     NSLog(@"path：%@", path);