公司产品做了备份相关功能,主要是检测未备份的图片,上传。以及检测已备份却不在相册的图片，恢复。
功能实现起来也不是很难,比对的话我用的MD5 ，进行比对文件是否重复，是否已上传 ，或未上传。MD5反正算是个问题，解决的办法不是很好，我会改进，因为功能急，暂时没有好的办法，只能 这么来了。具体怎么回事，我和大家说道说道。
获取系统相册的图片，在iOS8之前，一直使用的是
那么其二，就是枚举便利整个资源库，找出组。方法如下。
if (isAutoBackupOfVideo||isAutoBackupOfPhoto) {
if (!self.assetsLibrarry) {
self.assetsLibrarry=[[ALAssetsLibrary alloc]init];
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSMutableArray *groups=[NSMutableArray array];
[self.assetsLibrarry enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
if (group) {
[groups addObject:group];
}else{
for (ALAssetsGroup *singeGroup in groups) {
NSString *albumName=[singeGroup valueForProperty:ALAssetsGroupPropertyName];
NSMutableArray *photos=[NSMutableArray array];
NSMutableArray *videos=[NSMutableArray array];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[singeGroup enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if (result) {
if (IsEquallString(ALAssetTypePhoto, [result valueForProperty:ALAssetPropertyType])) {
if (isAutoBackupOfPhoto) {
Photo *photo=[[Photo alloc]init];
photo.url=[[[result defaultRepresentation] url] absoluteString];
photo.album=albumName;
photo.thumbnail=[UIImage imageWithCGImage:[result thumbnail]];
photo.name=[[result defaultRepresentation] filename];
photo.type=[photo.name pathExtension];
photo.size=[NSString stringWithFormat:@"%lld",[[result defaultRepresentation] size]];
[photos addObject:result];
}
}
if (IsEquallString(ALAssetTypeVideo, [result valueForProperty:ALAssetPropertyType])) {
if (isAutoBackupOfVideo) {
Video *video=[[Video alloc]init];
video.url=[[[result defaultRepresentation] url] absoluteString];
video.album=albumName;
video.name=[[result defaultRepresentation] filename];
video.type=[video.name pathExtension];
video.thumbnail=[UIImage imageWithCGImage:[result thumbnail]];
video.size=[NSString stringWithFormat:@"%lld",[[result defaultRepresentation] size]];
[videos addObject:result];
}
}
}else{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
if (photos.count) {
[self uploadPhoto:photos];
}
if (videos.count) {
[self uploadVideos:videos];
}
});
}
}];
});
}
}
} failureBlock:^(NSError *error) {
}];
});
}
你可以看见，资源库给你的是asset 对象，对象中有照片，也有视频。所以我们做了判断。判断依据就是ALAssetType。这里面有一个坑，在枚举方法的参数上。
enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop){}
WithTypes:(这个参数传递你想拿到的照片组类型)
enum {
ALAssetsGroupLibrary NS_ENUM_DEPRECATED_IOS(4_0, 9_0) = (1 <<0), // The Library group that includes all assets.
ALAssetsGroupAlbum NS_ENUM_DEPRECATED_IOS(4_0, 9_0) = (1 <<1), // All the albums synced from iTunes or created on the device.
ALAssetsGroupEvent NS_ENUM_DEPRECATED_IOS(4_0, 9_0) = (1 <<2), // All the events synced from iTunes.
ALAssetsGroupFaces NS_ENUM_DEPRECATED_IOS(4_0, 9_0) = (1 <<3), // All the faces albums synced from iTunes.
ALAssetsGroupSavedPhotos NS_ENUM_DEPRECATED_IOS(4_0, 9_0) = (1 <<4), // The Saved Photos album.
#if __IPHONE_5_0 <= __IPHONE_OS_VERSION_MAX_ALLOWED
ALAssetsGroupPhotoStream NS_ENUM_DEPRECATED_IOS(5_0, 9_0) = (1 <<5), // The PhotoStream album.
#endif
ALAssetsGroupAll NS_ENUM_DEPRECATED_IOS(4_0, 9_0) = 0xFFFFFFFF, // The same as ORing together all the available group types,
};
ALAssetsGroupAll实际则不是，为什么呢，主要是照片流。照片流这个组的对象很奇怪，data是空得。我想想也是。照片流本身就是一个映射类似的存在。
还有就是。既然是对象，我们怎么算MD5值呢？
本以为直接读取二进制，data，算出MD5。但是结果算出来的值居然和文件本身的值不一样。没有深究为什么不一样，直接换了一种解决办法。直接把对象的image写入文件，计算文件的MD5，呵呵，对了。奇怪。
但是计算MD5其实不是一个很好的办法。为什么呢。因为速度慢啊。。。解决办法。想了一下。准备采取多值对比。（如：时间，名称）,这样速度就会大幅度提升。
/*****************************************************分割线***********************************************/
下面讲讲另外一个值得注意的地方。那就是生命周期的问题。一个ALAssetsLibrary只在它自身的生命周期内有效。超出生命周期，那就导致你取不出来图片。简单来说，在一个ALAssetsLibrary的生命没有结束的时候，不要重新创建一个ALAssetsLibrary，这会结束上一个ALAssetsLibrary，导致文件提取不出来。
下面是，读取相册图片的MD5，及写入相册的源码。有需要的参考。
//获得本地图片的MD5数组
-(void)getLocalPhotos:(getLocalPhotosSuccessBlock)block{
if (!self.assetsLibrarry) {
self.assetsLibrarry=[[ALAssetsLibrary alloc]init];
}
NSMutableArray *groups=[NSMutableArray array];
[self.assetsLibrarry enumerateGroupsWithTypes:ALAssetsGroupSavedPhotos usingBlock:^(ALAssetsGroup *group, BOOL *stop) {
if (group) {
[groups addObject:group];
}else{
//
for (ALAssetsGroup *singeGroup in groups) {
NSString *albumName=[singeGroup valueForProperty:ALAssetsGroupPropertyName];
NSMutableArray *photos=[NSMutableArray array];//存储ALAsset对象
NSMutableArray * photoArr = [NSMutableArray array];//存储photo对象
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[singeGroup enumerateAssetsUsingBlock:^(ALAsset *result, NSUInteger index, BOOL *stop) {
if (result) {
if (IsEquallString(ALAssetTypePhoto, [result valueForProperty:ALAssetPropertyType])) {
Photo *photo=[[Photo alloc]init];
photo.url=[[[result defaultRepresentation] url] absoluteString];
photo.album=albumName;
photo.thumbnail=[UIImage imageWithCGImage:[result thumbnail]];
photo.name=[[result defaultRepresentation] filename];
photo.type=[photo.name pathExtension];
photo.md5 =[self getImageMD5WithUrl:result];
NSDate * date = [result valueForProperty:ALAssetPropertyDate];
NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
dateformatter.dateFormat=@"YYYY-MM-dd HH:mm:ss";
photo.lastWriteTime = [dateformatter stringFromDate:date];
photo.size=[NSString stringWithFormat:@"%lld",[[result defaultRepresentation] size]];
photo.result = result;
[photos addObject:result];
[photoArr addObject:photo];
}
}else{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
if (photoArr.count) {
block(photoArr);
}
});
}
}];
});
}
//
}
} failureBlock:^(NSError *error) {
}];
}
//写入相册
-(void)storeFinishByTypeFile:(TypeFile*)typeFile andIsSuccess:(BOOL)isSuccess{
if (isSuccess) {
NSString *path=[self getFilePathWithFile:typeFile];
NSData *imageData=[NSData dataWithContentsOfFile:path];
UIImage *image=[UIImage imageWithData:imageData];
if (!self.assetsLibrarry) {
self.assetsLibrarry = [[ALAssetsLibrary alloc]init];
}
[self.assetsLibrarry writeImageToSavedPhotosAlbum:image.CGImage orientation:(ALAssetOrientation)image.imageOrientation completionBlock:^(NSURL* assetURL, NSError* error) {
if (error!=nil) {
[Utils showAlertViewByText:[NSString stringWithFormat:@"%@保存失败",typeFile.name]];
}else{
typeFile.url=[assetURL description];
NSLog(@"Success--%@",typeFile.url);
[[NSFileManager defaultManager] removeItemAtPath:path error:nil];
}
}];
}else{
[Utils showAlertViewByText:[NSString stringWithFormat:@"%@保存失败",typeFile.name]];
}
}
for (ALAsset *asset in photos) {
NSString * MD5Str = [self getImageMD5WithUrl:asset ];
if (MD5Str.length>0) {
[[RequestIP shardRequestIP].localMd5Arr addObject:MD5Str];
if([MD5Arr indexOfObject:MD5Str]== NSNotFound){
NSLog(@"NSNotFound!");
if ([uploadArr indexOfObject:MD5Str] == NSNotFound) {
[uploadArr addObject:MD5Str];
NSLog(@"MD5Str:%@",MD5Str);
if (!IS_AUTO_CopyPhotos) {
break;
}
![[大整数乘法] java代码实现](https://img1.php1.cn/3cd4a/24c6f/9f3/0133bb25da242824.jpeg)
京公网安备 11010802041100号 | 京ICP备19059560号-4 | PHP1.CN 第一PHP社区 版权所有 