objc iOS 开发，取得当前目录下后缀名这.png的文件目录。

#import <UIKit/UIKit.h>

@interface imageSet : UIViewController
{
    NSMutableArray *filePathArray;
    NSFileManager *localFileManager;
}

    NSDirectoryEnumerator *myDirectoryEnumerator;
    NSFileManager *myFileManager=[NSFileManager defaultManager];

    myDirectoryEnumerator=[myFileManager enumeratorAtPath:[[NSBundle mainBundle] bundlePath]];
    
    NSString *docPath;
    docPath = [self documentsPath];   //得到文件的路径
    NSLog(@"%@", docPath);     
    filePathArray = [[NSMutableArray alloc]init];   //用来存目录名字的数组 
    localFileManager=[[NSFileManager alloc] init];  //用于获取文件列表
   
    NSString *file;
    
    while((file=[myDirectoryEnumerator nextObject]))     //遍历当前目录
    {
        if([[file pathExtension] isEqualToString:@"png"])   //取得后缀名这.png的文件名
        {
            [filePathArray addObject:[docPath stringByAppendingPathComponent:file]]; //存到数组
            NSLog(@"%@",file);
            //NSLog(@"%@",filePathArray);
        }
        
    }
    

//获得项目中当前文件名里的内容
-(NSString *)bundlePath:(NSString *)fileName {
    return [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:fileName];
    
    //[NSBundle mainBundle] resourcePath
}


//获得项目中同一级文件中目录名字
-(NSString *)documentsPath:(NSString *)fileName {
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    return [documentsDirectory stringByAppendingPathComponent:fileName];
}

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