iOS保存图片信息到相册

首先要引入ALAssetsLibrary库。

其次要用户授予定位服务权限。

保存附加信息到相册到代码如下：

NSData *imageData = UIImageJPEGRepresentation(image, 0.5);
        
        CLLocation *location = [[CLLocation alloc] initWithLatitude:latitude.doubleValue longitude:longitude.doubleValue];
        NSDictionary *locationDictionary = [Utility getGPSDictionaryForLocation:location];
        
        NSDate *shootTime = [NSDate date];
        NSDateFormatter *dateFormatter = [[[NSDateFormatter alloc] init] autorelease];
        [dateFormatter setDateFormat:@"yyyy:MM:dd HH:mm:ss"];
        NSString *strDate = [dateFormatter stringFromDate:shootTime];
        
        NSDictionary *metaDic = [NSDictionary dictionaryWithObjectsAndKeys:currentLocation, (NSString*)kCGImagePropertyGPSDictionary, [NSDictionary dictionaryWithObject:strDate forKey:(NSString *)kCGImagePropertyTIFFDateTime], (NSString *)kCGImagePropertyTIFFDictionary, nil];
        
        ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
        [library writeImageDataToSavedPhotosAlbum:imageData metadata:metaDic completionBlock:nil];
        [library release];
        [location release];