ios - iOS：自定义类导入

Question

我将一些将多次使用的代码移到一个类中。我没有得到错误，但我也没有得到结果。它似乎完全跳过了我的课。理想情况下，这个类应该做 NSURL conns 和 XMLParser 的东西来咀嚼来自我们托管 API 的数据馈送。我已经完成了这项工作，但想将我的代码的一些主要逻辑凝固并在某种程度上规范化/集中化。

一个函数 'bdCheckIfFileExistsAndisValid' 应该接受一个字符串但返回 BOOL 并且它根本没有被调用。

'bdParsePlaylistXML' 也不是应该接受一个字符串并返回一个数组的。

我在课堂上到处都设置了断点，没有一个被击中。我是新手，所以我不确定我是否做对了所有事情。这是一些代码，在此先感谢。

--------------------自定义类：（.h）

@interface bdXMLParser : NSObject {

    NSMutableArray *playlist;

    //Playlist XML info
    BOOL recordTrackName;
    BOOL recordTrackDescription;
    BOOL recordTrackThumbnailAbsoluteLocation;
    BOOL recordTrackURL;
    NSString *TrackName;
    NSString *TrackDescription;
    NSString *TrackThumbnailAbsoluteLocation;
    NSString *TrackURL;

}

-(NSMutableArray*) bdParsePlaylistXML:(NSString *) playlistXMLFileName;

-(BOOL) bdCheckIfFileExistsAndisValid:(NSString *) localFileName;

----------------自定义类（.m）：

#import "bdXMLParser.h"

@implementation bdXMLParser
{
    NSMutableData *webData;

    NSMutableArray *playlist;
    NSXMLParser *xmlParserPlaylist;    
}

-(NSString*) bdDocumentsDirectory{
    NSString* documentsPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    return documentsPath;
}

-(int) bdCheckFileCreationDate:(NSString *) fileName {

    //get XML file path
    NSString *localFilePath = [[self bdDocumentsDirectory] stringByAppendingPathComponent:fileName];

    //local file check
    NSFileManager *filemgr;
    filemgr = [NSFileManager defaultManager];
    NSDictionary* attrs = [filemgr attributesOfItemAtPath:localFilePath error:nil];
    NSDate *fileCreationDate = [attrs objectForKey: NSFileCreationDate];
    NSDate *rightNow = [NSDate date];
    NSTimeInterval lastDiff = [fileCreationDate timeIntervalSinceNow];
    int lastDiffINT = round(lastDiff);

    NSLog(@"NSFileCreationDate:%@",fileCreationDate);
    NSLog(@"CurrentDate:%@",rightNow);
    NSLog(@"lastDiff:%f",lastDiff);

    return lastDiffINT;    
}

-(BOOL) bdCheckIfFileExistsAndisValid:(NSString *) fileName {    
    //local file check    
    NSString* foofile = [[self bdDocumentsDirectory] stringByAppendingPathComponent:fileName];
    BOOL fileExists = [[NSFileManager defaultManager] fileExistsAtPath:foofile];

    if ((fileExists == YES) && ([self bdCheckFileCreationDate:foofile] > -86400))//(24 hrs = 86400 seconds)
        return YES;
    else
        return NO;

}

这是我尝试使用它的视图：（menu.h）

#import "bdXMLParser.h"
@interface MenuScreenViewController : UIViewController <NSXMLParserDelegate>
- (IBAction)btnPlayerPlayPause:(id)sender;

(menu.m)

- (IBAction)btnPlayerPlayPause:(id)sender {
    //if array exists, don't reload xml, dont reparse xml, just go to the view
    if (playlist.count == 0){

        //Playlist!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
        //========================================================================
        //1st: check to see if we have a local cached xml data
        //if we do, check if it is <24hr old and if so load it
        //if not, go get it with connection and overwrite/store it

        //init blogs NSMutableArray
        playlist = [[NSMutableArray alloc] init];

        //local file check
        bdXMLParser *myParser;
        BOOL fileExistsAndValid = NO;
=HERE!==fileExistsAndValid = [myParser bdCheckIfFileExistsAndisValid:PlaylistName];        

        //1st
        if (fileExistsAndValid)//(<24 hrs old)
        {
            NSLog (@"File fileExistsAndValid");

=AND HERE!!=playlist = [myParser bdParsePlaylistXML:PlaylistName];
            NSLog(@"playlist:%u", playlist.count);
            //load first track
            [self LoadTrack:0];
        }
        else{

            NSLog (@"File doesn't exist");
            //call refresh function
            //[self refreshAlbumPhotoXML];
            [myParser bdRefreshPlaylistXML];
        }
    }   
}

Answer 1

你忘了开课

bdXMLParser *myParser= [[bdXMLParster alloc]init];