获取ios app资源路径

    //根据文件名来获取文件路径  doucument
    - (NSString *)dataFilePath:(NSString *)sender {  
        NSArray *path = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,  
                    NSUserDomainMask,   
                    YES);  
        NSString *documentDirectory = [path objectAtIndex:0];  
        return [documentDirectory stringByAppendingPathComponent:sender];  
    } 

NSString *defaultDBPath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:filename]; //资源目录

NSArray *cache = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);     //caches目录
   NSString *cachePath = [cache objectAtIndex:0] ;     
        
   NSString *voiceName = [cachePath stringByAppendingPathComponent:[sender stringByAppendingString:@".wav"]];