iOS 获取系统相册全部照片以及照片信息

感谢：smile筱提供了参考代码传输门。

本文是在他的代码的基础上的进一步修改。

写下本博客主要是为了自己备份知识。方便查找。转载请注明出处！

具体实现：

#import <AssetsLibrary/AssetsLibrary.h>

优化一：

-(void)getImgs{

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

__block int photoCount = 0;

ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror){
NSLog(@"相册访问失败 =%@", [myerror localizedDescription]);
if ([myerror.localizedDescription rangeOfString:@"Global denied access"].location!=NSNotFound) {
NSLog(@"无法访问相册.请在'设置->定位服务'设置为打开状态.");
}else{
NSLog(@"相册访问失败.");
}
};

ALAssetsGroupEnumerationResultsBlock groupEnumerAtion = ^(ALAsset *result,NSUInteger index, BOOL *stop){
if (result!=NULL) {

if ([[result valueForProperty:ALAssetPropertyType]isEqualToString:ALAssetTypePhoto]) {

NSString *photoDefaultPath=[NSString stringWithFormat:@"%@",result.defaultRepresentation.url];
NSString *photoThumPath=[NSString stringWithFormat:@"%@",result.defaultRepresentation.url];
NSString *photoName=[NSString stringWithFormat:@"%@",result.defaultRepresentation.filename];
NSDictionary *photoMetaData = result.defaultRepresentation.metadata;
NSDictionary *photoGPS = [photoMetaData objectForKey:@"{GPS}"];
if (photoGPS == nil) {
photoGPS = @{@"Latitude":@"0.0",@"Longitude":@"0.0"};
}
NSString *photoDateTime;
if ([[photoMetaData objectForKey:@"{TIFF}"] objectForKey:@"DateTime"] == nil) {
photoDateTime = @"0";
}else{
photoDateTime = [[photoMetaData objectForKey:@"{TIFF}"] objectForKey:@"DateTime"];
}

//图片的url
/*result.defaultRepresentation.fullScreenImage//图片的大图
result.thumbnail                            //图片的缩略图小图
//                    NSRange range1=[urlstr rangeOfString:@"id="];
//                    NSString *resultName=[urlstr substringFromIndex:range1.location+3];
//                    resultName=[resultName stringByReplacingOccurrencesOfString:@"&ext=" withString:@"."];//格式demo:123456.png
*/
NSDictionary *photoDic = @{@"photoDefaultPath":photoDefaultPath,@"photoThumPath":photoThumPath,@"photoName":photoName,@"photoGPS":photoGPS,@"photoDateTime":photoDateTime};
NSLog(@"photoDic:%@",photoDic);
[_systemPhotoArray addObject:photoDic];

NSLog(@"加载全部照片共%d张中的第%d张",photoCount,index + 1);

if (photoCount == index + 1) {
NSLog(@"全部加载完毕");
}
}
}
};

ALAssetsLibraryGroupsEnumerationResultsBlock
libraryGroupsEnumeration = ^(ALAssetsGroup* group,BOOL* stop){
if (group!=nil) {
NSString *g=[NSString stringWithFormat:@"%@",group];//获取相簿的组
NSLog(@"gg:%@",g);//gg:ALAssetsGroup - Name:Camera Roll, Type:Saved Photos, Assets count:71

NSString *g1=[g substringFromIndex:16 ] ;
NSArray *arr=[NSArray arrayWithArray:[g1 componentsSeparatedByString:@","]];
NSString *g2=[[arr objectAtIndex:0]substringFromIndex:5];
if ([g2 isEqualToString:@"Camera Roll"]) {
g2=@"相机胶卷";
}
//                NSString *groupName=g2;//组的name

photoCount = group.numberOfAssets;

[group enumerateAssetsUsingBlock:groupEnumerAtion];

}else{

}
};

ALAssetsLibrary* library = [[ALAssetsLibrary alloc] init];
[library enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:libraryGroupsEnumeration
failureBlock:failureblock];
});
}

优化二(使用block回调)：

+ (void)SystemPhotoAlbumPhotoSuccess:(void(^)(NSArray *photoArray))success progress:(void(^)(int currentCount,int totalCount))progress fail:(void(^)(NSString *error))fail{

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

__block int photoCount = 0;
__block NSMutableArray *phArray = [NSMutableArray array];

ALAssetsLibraryAccessFailureBlock failureblock = ^(NSError *myerror){
dispatch_async(dispatch_get_main_queue(), ^{
if (fail) {
fail([myerror localizedDescription]);
}
NSLog(@"相册访问失败 =%@", [myerror localizedDescription]);
if ([myerror.localizedDescription rangeOfString:@"Global denied access"].location!=NSNotFound) {
NSLog(@"无法访问相册.请在'设置->定位服务'设置为打开状态.");
}else{
NSLog(@"相册访问失败.");
}
});
};

ALAssetsGroupEnumerationResultsBlock groupEnumerAtion = ^(ALAsset *result,NSUInteger index, BOOL *stop){
if (result!=NULL) {

if ([[result valueForProperty:ALAssetPropertyType]isEqualToString:ALAssetTypePhoto]) {

NSString *photoDefaultPath=[NSString stringWithFormat:@"%@",result.defaultRepresentation.url];
NSString *photoThumPath=[NSString stringWithFormat:@"%@",result.defaultRepresentation.url];
NSString *photoName=[NSString stringWithFormat:@"%@",result.defaultRepresentation.filename];
NSDictionary *photoMetaData = result.defaultRepresentation.metadata;
NSDictionary *photoGPS = [photoMetaData objectForKey:@"{GPS}"];
if (photoGPS == nil) {
photoGPS = @{@"Latitude":@"0.0",@"Longitude":@"0.0"};
}
NSString *photoDateTime;
if ([[photoMetaData objectForKey:@"{TIFF}"] objectForKey:@"DateTime"] == nil) {
photoDateTime = @"0";
}else{
photoDateTime = [[photoMetaData objectForKey:@"{TIFF}"] objectForKey:@"DateTime"];
}

//图片的url
/*result.defaultRepresentation.fullScreenImage//图片的大图
result.thumbnail //图片的缩略图小图
// NSRange range1=[urlstr rangeOfString:@"id="];
// NSString *resultName=[urlstr substringFromIndex:range1.location+3];
// resultName=[resultName stringByReplacingOccurrencesOfString:@"&ext=" withString:@"."];//格式demo:123456.png
*/
NSDictionary *photoDic = @{@"photoDefaultPath":photoDefaultPath,@"photoThumPath":photoThumPath,@"photoName":photoName,@"photoGPS":photoGPS,@"photoDateTime":photoDateTime};
// NSLog(@"photoDic:%@",photoDic);
[phArray addObject:photoDic];
// NSLog(@"加载全部照片共%d张中的第%d张",photoCount,index + 1);

dispatch_async(dispatch_get_main_queue(), ^{
if (progress) {
progress(index +1 , photoCount);
}
});

if (photoCount == index + 1) {
// NSLog(@"全部加载完毕");
dispatch_async(dispatch_get_main_queue(), ^{
if (success) {
success(phArray);
}
});
}
}
}
};

ALAssetsLibraryGroupsEnumerationResultsBlock
libraryGroupsEnumeration = ^(ALAssetsGroup* group,BOOL* stop){
if (group!=nil) {
NSString *g=[NSString stringWithFormat:@"%@",group];//获取相簿的组
// NSLog(@"gg:%@",g);//gg:ALAssetsGroup - Name:Camera Roll, Type:Saved Photos, Assets count:71

NSString *g1=[g substringFromIndex:16 ] ;
NSArray *arr=[NSArray arrayWithArray:[g1 componentsSeparatedByString:@","]];
NSString *g2=[[arr o
a0b1
bjectAtIndex:0]substringFromIndex:5];
if ([g2 isEqualToString:@"Camera Roll"]) {
g2=@"相机胶卷";
}
// NSString *groupName=g2;//组的name

photoCount = group.numberOfAssets;

[group enumerateAssetsUsingBlock:groupEnumerAtion];

}else{

}
};

ALAssetsLibrary* library = [[ALAssetsLibrary alloc] init];
[library enumerateGroupsWithTypes:ALAssetsGroupAll
usingBlock:libraryGroupsEnumeration
failureBlock:failureblock];
});
}

下面是调用实例(ToolsManager是我的一个工具类,我将此方法写进工具类作为类方法调用)：

[ToolsManager SystemPhotoAlbumPhotoSuccess:^(NSArray *photoArray) {
NSLog(@"photoArray.count:%d",photoArray.count);
} progress:^(int currentCount, int totalCount) {
CGFloat percent = (CGFloat)currentCount/(CGFloat)totalCount;
_photoAlbumBtn.text = [NSString stringWithFormat:@"载入照片中(%d%%)...",(int)(percent * 100)];
_photoAlbumBtn.progress = percent;
} fail:^(NSString *error) {
UIAlertView *av;
if ([error rangeOfString:@"Global denied access"].location!=NSNotFound) {
av = [[UIAlertView alloc] initWithTitle:@"错误"
message:@"无法访问相册.请在'设置->定位服务'设置为打开状态."
delegate:self
cancelButtonTitle:@"好的"
otherButtonTitles:nil, nil];
}else{
av = [[UIAlertView alloc] initWithTitle:@"错误"
message:@"相册访问失败." delegate:self
cancelButtonTitle:@"好的"
otherButtonTitles:nil, nil];
}
[av show];
}];

上面是获取照片URL的。

根据照片URL可以用一下代码来反向获取到UIImage

//------------------------根据图片的url反取图片－－－－－

ALAssetsLibrary *assetLibrary=[[ALAssetsLibraryalloc] init];
NSURL *url=[NSURLURLWithString:urlStr];
[assetLibrary assetForURL:url resultBlock:^(ALAsset *asset)  {
UIImage *image=[UIImage imageWithCGImage:asset.thumbnail];
cellImageView.image=image;

}failureBlock:^(NSError *error) {
NSLog(@"error=%@",error);
}
];
//－－－－－－－－－－－－－－－－－－－－－