我正在研究使用YouTube Objective-C API檢索YouTube播放列表鏈接的類。iOS應用中youtube播放列表的網址
每個URL被存儲爲在稱爲arrayURL
陣列的字符串strURL
,(現在)arrayURL
最終存儲在arrayFinal
,我想從一個不同的類訪問。
在函數內我得到我想要的信息(NSLog(@"%@", self.arrayFinal);
)。但是當從另一個類(例如ViewController)調用函數時,我總是會返回一個空數組。
ViewController.m
YTDataHandler *youtubeObj = [YTDataHandler new]; [youtubeObj initYoutubeArray]; NSLog(@"%@", [youtubeObj arrayFinal]);
YTDataHandler.h
#import <Foundation/Foundation.h>
@interface YTDataHandler : NSObject
{
NSMutableArray *arrayFinal;
}
- (void)initYoutubeArray;
- (void)getYoutubeContent;
@property (nonatomic, retain) NSMutableArray *arrayFinal;
@end
YTDataHandler.m
#import "YTDataHandler.h"
#import "GTLServiceYouTube.h"
#import "GTLYouTube.h"
#import "GTLYouTubePlaylistSnippet.h"
#import "GTLYouTubeResourceId.h"
@implementation YTDataHandler
@synthesize arrayFinal;
- (void)initYoutubeArray {
self.arrayFinal = [[NSMutableArray alloc] init];
[self getYoutubeContent];
}
- (void)getYoutubeContent {
NSMutableArray *arrayURL = [[NSMutableArray alloc] init];
// Create a service object for executing queries
GTLServiceYouTube *service = [[GTLServiceYouTube alloc] init];
// API key
service.APIKey = @"YOUR_API_KEY";
// Create a query
GTLQueryYouTube *query = [GTLQueryYouTube queryForPlaylistItemsListWithPart : @"id, snippet, contentDetails"];
query.playlistId = @"UUa0XHGDbBL8re8UgO-OWNPA";
query.maxResults = 20;
query.type = @"video";
// Execute the query
GTLServiceTicket *ticket = [service executeQuery : query
completionHandler : ^(GTLServiceTicket *ticket, id object, NSError *error) {
// This callback block is run when the fetch completes
if (error == nil) {
GTLYouTubePlaylistItemListResponse *items = object;
// iteration of items and subscript access to items.
for (GTLYouTubePlaylistItem *item in items) {
// IDs of videos
NSString *strVideoId = [item.snippet.resourceId JSONValueForKey : @"videoId"];
// encode and extend the videoId, result as an URL
NSString *strEncoded = [strVideoId stringByAddingPercentEscapesUsingEncoding : NSUTF8StringEncoding];
NSString *strURL = [NSString stringWithFormat:@"http://www.youtube.com/watch?v=%@", strEncoded];
// store strURL
[arrayURL addObject : (@"%@", strURL)];
}
// finally store arrayURL
[self.arrayFinal addObject : (@"%@", arrayURL)];
NSLog(@"%@", self.arrayFinal);
} else {
NSLog(@"Error: %@", error);
}
}];
}
@end
什麼我在// Execute the query
-part做錯了什麼?