Java、Objective-Cで実行結果を非同期に取得する方法

いつもやり方を忘れてしまうのでメモ

Javaでメソッドの引数にリスナーを渡す

HogeConnection.java

private SearchWebListener searchWebListener;

public void searchWeb(String searchText, SearchWebListener _searchWebListener) {
    searchWebListener = _searchWebListener;


    // 時間がかかる処理を非同期で //

    searchWebListener.didFinish(CONNECTION_NO_ERROR, resultList);

}

public interface SearchWebListener {
    public void didFinish(int err, List<HogeSearchResultData> resultList);  
}

呼び出し側

Hoge.java

HogeConnection hogeConnection = new HogeConnection();
hogeConnection.searchWeb(searchText, new HogeConnection.SearchWebListener() 
    @Override
    public void didFinish(int err, List<HogeSearchResultData> _resultList) {
        if (err == HogeConnection.CONNECTION_NO_ERROR) {

        }
        // エラーの時の処理
        else {

        }                   
    }
}); 

または

Hoge.java

public void hogeMain() {
    HogeConnection hogeConnection = new HogeConnection();
    hogeConnection.searchWeb(searchText, new MySearchWebListener());
}

public class MySearchWebListener implements HogeConnection.SearchWebListene{
    @Override
    public void didFinish(int err, List<HogeSearchResultData> _resultList) {
        if (err == HogeConnection.CONNECTION_NO_ERROR) {

        }
        // エラーの時の処理
        else {

        }                   
    }
}   

またはHoge.javaにHogeConnection.SearchWebListeneをimplementsしてもいい

Objective-CでBlocksを使う

typedef void (^TestMethodBlock)(BOOL arg1, BOOL arg2);

- (void)testMethodWithCompletion:(TestMethodBlock)_completion {

    TestMethodBlock completion = [_completion copy];

    // 別スレッド
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),^{

        /// 時間のかかる処理 ///

        // メインスレッド
        dispatch_sync(dispatch_get_main_queue(), ^{
            completion(YES, YES);
        });
    });
}

呼び出

    [self testMethodWithCompletion:^(BOOL arg1, BOOL arg2) {

    }];

Objective-Cでdelegateを使った方法

HogeDelegate.h

@protocol HogeDelegate <NSObject>
- (void)didFinish:(NSArray*)_resultList;
@end

HogeConnection.h

#import <UIKit/UIKit.h>
#import "HogeDelegate.h"

@interface HogeConnection : NSObject

@property (nonatomic, weak) id<HogeDelegate> delegate;

- (void)connection;

@end

HogeConnection.m

#import "HogeConnection.h"

@implementation HogeConnection

@synthesize delegate = _ delegate;

- (void)connection {

    // 別スレッド　時間がかかる処理

    [delegate didFinish:resultList];
}

@end

呼び出し側

HogeClass.h

#import <UIKit/UIKit.h>
#import "HogeConnection.h"

@interface HogeClass. : NSObject<HogeDelegate>
@end

HogeClass.m

- (void)hogeMain {
    HogeConnection hogeConnection = [HogeConnection alloc];
    hogeConnection.delegate = self;
    [hogeConnection connection];
}

#pragma mark - hogeConnection delegate
- (void)didFinish:(NSArray*)_resultList {

}