iOS development--Practical technology OC Articles & about customizing albums Deleting the Resurrection implementation

About customizing albums Deleting the Resurrection implementation

Here (http://www.cnblogs.com/iCocos/p/4705585.html) We mentioned it.

• 1: Simple implementation of get system album pictures and save Pictures to the system album
• 2: Define a custom album and save it to a custom album

This is a long time to implement all of the above features in a simple example, and add a useful feature to implement

• The custom album in the app is deleted and the photo is saved again after deletion cannot be successful

Here is a library of the system:alassetslibrary Let's take a look at the photos we got in the album.

1- (void) Getallphotos2 {3Alassetslibrary *library =[[Alassetslibrary alloc] init];4     //Traverse all folders, a Alassetsgroup object represents a folder5[Library Enumerategroupswithtypes:alassetsgroupall usingblock:^ (alassetsgroup *group, BOOL *stop) {6         //Traverse all multimedia files (Pictures, videos) within a folder, and a Alasset object represents a picture7[Group enumerateassetsusingblock:^ (Alasset *result, Nsuinteger index, BOOL *stop) {8             //thumbnail Images9Xmglog (@"%@", [UIImage imageWithCGImage:result.thumbnail]);Ten             //get the original picture One             //Xmglog (@ "%@", [UIImage imageWithCGImage:result.defaultRepresentation.fullResolutionImage]); A         }]; -         - } Failureblock:nil]; the}

Let's look at the specific implementation of the Code One: First define a property surge to record and implement some other functions

/**/*library;

 Second: Then lazy load this property

1 -(alassetslibrary *) library2{3     if (!  _library) {4         _library = [[Alassetslibrary alloc] init]; 5     }6     return  _library; 7 }8  

Three: Click the Save button implementation

1-(ibaction) Save2 {3     //get the name of the folder4__block NSString *groupname =[self groupName];5    6     //Weak reference to self7 xmgweakself;8    9     //Photo GalleryTen__weak alassetslibrary *weaklibrary =self.library; One     A     //Create a folder -[Weaklibrary addassetsgroupalbumwithname:groupname resultblock:^ (Alassetsgroup *Group) { -         if(group) {//the newly created folder the             //add a picture to a folder - [Weakself Addimagetogroup:group]; -}Else{//folder already exists -[Weaklibrary enumerategroupswithtypes:alassetsgroupall usingblock:^ (alassetsgroup *group, BOOL *stop) { +NSString *name =[group Valueforproperty:alassetsgrouppropertyname]; -                 if([name Isequaltostring:groupname]) {//is the folder that you created yourself +                     //add a picture to a folder A [Weakself Addimagetogroup:group]; at                     -*stop = YES;//Stop Traversal -}Else if([Name isequaltostring:@"Camera Roll"]) { -                     //the folder was forcibly deleted by the user -GroupName = [GroupName stringbyappendingstring:@" "]; -                     //Store a new name in [[Nsuserdefaults standarduserdefaults] Setobject:groupname Forkey:xmggroupnamekey]; - [[Nsuserdefaults standarduserdefaults] synchronize]; to                     //Create a new folder +[Weaklibrary addassetsgroupalbumwithname:groupname resultblock:^ (Alassetsgroup *Group) { -                         //add a picture to a folder the [Weakself Addimagetogroup:group]; * } Failureblock:nil]; $                 }Panax Notoginseng } Failureblock:nil]; -         } the } Failureblock:nil]; + } A  

Four: Add a picture

1 /**2 * Add a picture to a folder3  */4- (void) Addimagetogroup: (Alassetsgroup *) Group5 {6__weak alassetslibrary *weaklibrary =self.library;7     //pictures you need to save8Cgimageref image =Self.imageView.image.CGImage;9    Ten     //add picture to "Camera Roll" One[Weaklibrary writeimagetosavedphotosalbum:image metadata:nil completionblock:^ (nsurl *assetURL, NSError *error) { A[Weaklibrary assetforurl:asseturl resultblock:^ (Alasset *Asset) { -             //add a picture to a custom folder - [group Addasset:asset]; the[Svprogresshud Showsuccesswithstatus:@"Save success!"]; - } Failureblock:nil]; -     }]; -}

 Five: About the group name in ShaheFirst define a key to save the name and a name to save.

Static Const @" Icocosgroupnamekey " ; Static Const @" Icocos ";

 implementing the access of the ancestral name

1-(NSString *) GroupName2 {3     //first get the name from the sandbox4NSString *groupname =[[Nsuserdefaults standarduserdefaults] stringforkey:xmggroupnamekey];5     if(GroupName = = nil) {//No folder names are stored in the sandbox6GroupName =Xmgdefaultgroupname;7        8         //Store name in sandbox9 [[Nsuserdefaults standarduserdefaults] Setobject:groupname Forkey:xmggroupnamekey];Ten [[Nsuserdefaults standarduserdefaults] synchronize]; One     } A     -     returnGroupName; - } the  

iOS development--Practical technology OC Articles & about customizing albums Deleting the Resurrection implementation