#iOS开发笔记 # How to implement an in-app search in iOS9 (objective-c)

IOS9 has added a lot of new features (What ' New in IOS 9.0-apple Developer), and the search feature is interesting to me. In a nutshell, there are three different ways to implement local and server two searches.

Try it yourself. The second is to use the core Spotlight framework to implement the index APP Content. The main steps are as follows:

1. Add the required framework

Requires two framework:corespotlight and mobilecoreservices, which can be directly @import (the difference between @import and #import: @import vs #import), This allows you to not add the framework manually in your project.

@import corespotlight;
@import mobilecoreservices;

2. Create Cssearchableitemattributeset

Cssearchableitemattributeset *myattributeset = [[Cssearchableitemattributeset alloc] Initwithitemcontenttype: ( NSString *) Kuttypedata];
    The title shown in the search results
    myattributeset.title = @ "Apple";
    The details displayed in the search results
    myattributeset.contentdescription = @ "A red apple";
    Keywords, when the user input the following string, the relevant content will be retrieved
    myattributeset.keywords = [Nsarray arraywithobjects:@ "Hello", @ "Search", @ "Fruit", NIL];

3. Create a searchable entry Cssearchableitem

Initializes a searchable entry
    cssearchableitem *item = [[Cssearchableitem alloc] initwithuniqueidentifier:@ "apple-001" domainidentifier:@ "xxx.fruit.com" attributeset:myattributeset];

4. Add Search Entry

Add Portal
    [[Cssearchableindex Defaultsearchableindex] Indexsearchableitems:@[item] completionhandler:^ (NSError * _ Nullable Error {
        if (error) {
            NSLog (@ "Search item failed to is indexed");
        } else {
            NSLog (@ "Search item in Dexed ");
        }
    ;

5. There are three ways to delete the search portal by deleting the search portal, based on Uniqueid,domain and deleting all portals

[[Cssearchableindex Defaultsearchableindex] Deletesearchableitemswithidentifiers:[nsarray arrayWithObjects:@ " apple-001 ", @" apple-002 ", Nil] completionhandler:^ (Nserror * _nullable error) {
        if (!error) {
            NSLog (@" Items deleted ");
        }
    ;
    
    [[Cssearchableindex Defaultsearchableindex] Deletesearchableitemswithdomainidentifiers:[nsarray arrayWithObjects: @ "xxx.fruit.com", Nil] completionhandler:^ (Nserror * _nullable error) {
        if (!error) {
            NSLog (@ "Items deleted"); c7/>}
    }];
    
    [[Cssearchableindex Defaultsearchableindex] deleteallsearchableitemswithcompletionhandler:^ (NSError * _Nullable Error) {
        if (!error) {
            NSLog (@ "All items deleted");
        }
    ];

6. Full example

//
// FirstViewController.m
// Hello Search

#import "FirstViewController.h"
@import CoreSpotlight;
@import MobileCoreServices;

@interface FirstViewController ()

@end

@implementation FirstViewController

-(void) viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    
    [self initSearchableIndex];
}

-(void) didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(void) initSearchableIndex {
    
    CSSearchableItemAttributeSet * myAttributeSet = [[CSSearchableItemAttributeSet alloc] initWithItemContentType: (NSString *) kUTTypeData];
    // title displayed in search results
    myAttributeSet.title = @ "Apple";
    // Details shown in search results
    myAttributeSet.contentDescription = @ "A red apple";
    // keyword, when the user enters the following string, the relevant content will be retrieved
    myAttributeSet.keywords = [NSArray arrayWithObjects: @ "Hello", @ "Search", @ "Fruit", nil];
    
    // initialize a searchable entry
    CSSearchableItem * item = [[CSSearchableItem alloc] initWithUniqueIdentifier: @ "apple-001" domainIdentifier: @ "xxx.fruit.com" attributeSet: myAttributeSet];
    
    // add entry
    [[CSSearchableIndex defaultSearchableIndex] indexSearchableItems: @ [item] completionHandler: ^ (NSError * _Nullable error) {
        if (error) {
            NSLog (@ "Search item failed to be indexed");
        } else {
            NSLog (@ "Search item indexed");
        }
    }];
}

-(void) deleteSearchableIndex {
    [[CSSearchableIndex defaultSearchableIndex] deleteSearchableItemsWithIdentifiers: [NSArray arrayWithObjects: @ "apple-001", @ "apple-002", nil] completionHandler: ^ (NSError * _Nullable error) {
        if (! error) {
            NSLog (@ "Items deleted");
        }
    }];
    
    [[CSSearchableIndex defaultSearchableIndex] deleteSearchableItemsWithDomainIdentifiers: [NSArray arrayWithObjects: @ "xxx.fruit.com", nil] completionHandler: ^ (NSError * _Nullable error) {
        if (! error) {
            NSLog (@ "Items deleted");
        }
    }];
    
    [[CSSearchableIndex defaultSearchableIndex] deleteAllSearchableItemsWithCompletionHandler: ^ (NSError * _Nullable error) {
        if (! error) {
            NSLog (@ "All items deleted");
        }
    }];
}

@end