How can you determine if a file exists within the app bundle?

问题

Sorry, dumb question number 2 today. Is it possible to determine if a file is contained within the App Bundle? I can access files no problem, i.e.,

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

But can't figure out how to check if the file exists there in the first place.

Regards

Dave

回答1:

[[NSFileManager defaultManager] fileExistsAtPath:pathAndFileName];

回答2:

This code worked for me...

NSString *pathAndFileName = [[NSBundle mainBundle] pathForResource:fileName ofType:nil];
if ([[NSFileManager defaultManager] fileExistsAtPath:pathAndFileName])
{
    NSLog(@"File exists in BUNDLE");
}
else
{
    NSLog(@"File not found");
}

Hopefully, it will help somebody...

回答3:

pathForResource will return nil if the resource does not exist. Checking again with NSFileManager is redundant.

Obj-C:

 if (![[NSBundle mainBundle] pathForResource:@"FileName" ofType:@"plist"]) {                                              
      NSLog(@"The path could not be created.");
      return;
 }

Swift 4:

 guard Bundle.main.path(forResource: "FileName", ofType: "plist") != nil else {
      print("The path could not be created.")
      return
 }

回答4:

NSFileManager *fileManager = [NSFileManager defaultManager];
    NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"filename"];
    if(![fileManager fileExistsAtPath:path])
    {
        // do something
    }

回答5:

Same as @Arkady, but with Swift 2.0:

First, call a method on mainBundle() to help create a path to the resource:

guard let path = NSBundle.mainBundle().pathForResource("MyFile", ofType: "txt") else {
    NSLog("The path could not be created.")
    return
}

Then, call a method on defaultManager() to check whether the file exists:

if NSFileManager.defaultManager().fileExistsAtPath(path) {
    NSLog("The file exists!")
} else {
    NSLog("Better luck next time...")
}

来源：https://stackoverflow.com/questions/2024302/how-can-you-determine-if-a-file-exists-within-the-app-bundle

标签

iphone

nsbundle