iOS-实现图片的IPTC信息提取

iOS-实现图片的IPTC信息提取

//判断字典是否为空
#define NULLDic(dic) ((dic == nil)||[dic isKindOfClass:[NSNull class]]||dic == 0)

///获取图片IPTC信息
+ (NSDictionary *)getImageDescriptionStrFromData:(NSData *)imageData {
    CGImageSourceRef imageSource = CGImageSourceCreateWithData((CFDataRef)imageData, NULL);
    CFDictionaryRef imageInfo = CGImageSourceCopyPropertiesAtIndex(imageSource, 0,NULL);
    //图片标题
    NSString *titleStr = @"";
    //图片描述
    NSString *contentStr = @"";
    //图片拍摄时间
    NSString *shootTimeStr = @"";
    
    //tiff
    CFDictionaryRef tiffRef = CFDictionaryGetValue(imageInfo, kCGImagePropertyTIFFDictionary);
    NSDictionary *tiffRefDic = (__bridge NSDictionary *)tiffRef;
    if (!NULLDic(tiffRefDic)) {
        CFStringRef tiffStringRef = CFDictionaryGetValue(tiffRef , kCGImagePropertyTIFFImageDescription);
        NSString *tiffStr = (__bridge NSString *)tiffStringRef;
        if ([tiffStr containsString:@" "]) {
            NSRange blankRange = [tiffStr rangeOfString:@" "];
            titleStr = [tiffStr substringToIndex:blankRange.location];
            contentStr = [tiffStr substringFromIndex:blankRange.location + blankRange.length];
        } else {
            contentStr = tiffStr;
        }
    }
    
    //拍摄时间
    CFDictionaryRef exifRef = CFDictionaryGetValue(imageInfo, kCGImagePropertyExifDictionary);
    NSDictionary *exifRefDic = (__bridge NSDictionary *)exifRef;
    if (!NULLDic(exifRefDic)) {
        CFStringRef exifStringRef = CFDictionaryGetValue(exifRef , kCGImagePropertyExifDateTimeOriginal);
        shootTimeStr = (__bridge NSString *)exifStringRef;
        NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yyyy:MM:dd HH:mm:ss"];
        NSDate *timeDate = [dateFormatter dateFromString:shootTimeStr];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
        shootTimeStr = [dateFormatter stringFromDate:timeDate];
    }
    
    NSDictionary *iptcDic = @{@"title":titleStr?:@"",
                              @"content":contentStr?:@"",
                              @"shootTime":shootTimeStr?:@"",
                              };
    return iptcDic;
}