IOS檢測指定路徑的檔案是否存在

來源:互聯網
上載者:User

   本文給大家分享的是在IOS開發中檢測指定檔案是否存在的方法,給大家匯總了4種,十分實用,小夥伴們根據自己的需求自由選擇吧。

  代碼如下:

  - (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,@"建立目錄失敗");

  NSString *result = [path stringByAppendingPathComponent:file];

  return result;

  }

  - (void)viewDidLoad

  {

  [super viewDidLoad];

  //此處首先指定了圖片存取路徑(預設寫到應用程式沙箱 中)

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

  //並給檔案起個檔案名稱

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

  //存放圖片的檔案夾

  NSString *imagePath =[imageDir stringByAppendingPathComponent:@"檔案名稱.png"];

  NSData *data = nil;

  //檢查圖片是否已經儲存到本地

  if([self isExistsFile:imagePath]){

  data=[NSData dataWithContentsOfFile:imagePath];

  }else{

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

  //建立檔案夾路徑

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

  //建立圖片

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

  }

  imageView.image = [UIImage imageWithData:data];

  }

  檢查檔案是否存在

  代碼如下:

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

  if(path==NULL)

  方法二:

  代碼如下:

  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:

  代碼如下:

  //判斷檔案是否存在

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

  {

  NSLog(@"請確認該檔案是否存在!");

  return;

  }

  方法四:

  代碼如下:

  //判斷檔案是否存在

  -(BOOL)judgeFileExist:(NSString * )fileName

  {

  //擷取檔案路徑

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

  if(path==NULL)

  return NO;

  returnYES;

  }

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