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IOS检测指定路径的文件是否存在

作者:佚名    责任编辑:admin    更新时间:    2015-10-15 11:03:00

   本文给大家分享的是在IOS开发中检测指定文件是否存在的方法,给大家汇总了4种,十分实用,小伙伴们根据自己的需求自由选择吧。

  代码如下:

  - (NSString *)dataPath:(NSString *)file

  {

  NSString *path = [[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"] stringByAppendingPathComponent:@"badge"];

  BOOL bo = [[NSFileManager defaultManager] createDirectoryAtPath:path withIntermediateDirectories:YES attributes:nil error:nil];

  NSAssert(bo,@"创建目录失败");

  NSString *result = [path stringByAppendingPathComponent:file];

  return result;

  }

  - (void)viewDidLoad

  {

  [super viewDidLoad];

  //此处首先指定了图片存取路径(默认写到应用程序沙盒 中)

  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);

  //并给文件起个文件名

  NSString *imageDir = [[[paths objectAtIndex:0] stringByAppendingPathComponent:@"163"] stringByAppendingPathComponent:@"songzi"];

  //存放图片的文件夹

  NSString *imagePath =[imageDir stringByAppendingPathComponent:@"文件名.png"];

  NSData *data = nil;

  //检查图片是否已经保存到本地

  if([self isExistsFile:imagePath]){

  data=[NSData dataWithContentsOfFile:imagePath];

  }else{

  data = [NSData dataWithContentsOfURL:[NSURL URLWithString: @"网址"]];

  //创建文件夹路径

  [[NSFileManager defaultManager] createDirectoryAtPath:imageDir withIntermediateDirectories:YES attributes:nil error:nil];

  //创建图片

  [UIImagePNGRepresentation([UIImage imageWithData:data]) writeToFile:imagePath atomically:YES];

  }

  imageView.image = [UIImage imageWithData:data];

  }

  检查文件是否存在

  代码如下:

  NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:@""];

  if(path==NULL)

  方法二:

  代码如下:

  NSFileManager *fileManager = [NSFileManager defaultManager];

  //Get documents directory

  NSArray *directoryPaths = NSSearchPathForDirectoriesInDomains

  (NSDocumentDirectory, NSUserDomainMask, YES);

  NSString *documentsDirectoryPath = [directoryPaths objectAtIndex:0];

  if ([fileManager fileExistsAtPath:@""]==YES) {

  NSLog(@"File exists");

  }

  方法三:

  代码如下:

  //判断文件是否存在

  if(![c judgeFileExist:@"user.plist"])

  {

  NSLog(@"请确认该文件是否存在!");

  return;

  }

  方法四:

  代码如下:

  //判断文件是否存在

  -(BOOL)judgeFileExist:(NSString * )fileName

  {

  //获取文件路径

  NSString *path = [[NSBundle mainBundle] pathForResource:fileName ofType:@""];

  if(path==NULL)

  return NO;

  returnYES;

  }