nsuserdefaults

When testing my app on the simulator, I like the ability to edit, or even trash the apps plist file (which contains the NSUserDefaults) from the iPhone Simulator folder. This proves useful when testing (e.g. your app stores a dictionary in there, but you change the model/keys that you use for this data, and therefore need to remove the dictionary stored). Is it possible to access this file on device (for your own app), without jailbreak? Thanks in advance Jano The file is in Library/Preferences . The file is a binary plist with name <iOS application target identifier>.plist (look for the

I've got dictionary stored in NSUserDefaults and I need to add/remove items in this dictionary. It bothers me that to do this I have to create mutable copy of entire dictionary, change one element and replace entire dictionary with new copy. copy = [[defaults objectForKey:@"foo"] mutableCopy]; [copy setObject:… forKey:@"bar"]; [defaults setObject:copy forKey:@"foo"]; and it involves even more copying and re-setting for objects deeper in the hierarchy. Is there a better way? I've tried to use [defaults setValue:… forKeyPath:@"foo.bar"] but that doesn't seem to work (object is not mutable). I

How would I check if it is the first launch of of my application using NSUserDefaults and running some code for the first time my app opens? This should point you in the right direction: static NSString* const hasRunAppOnceKey = @"hasRunAppOnceKey"; NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults]; if ([defaults boolForKey:hasRunAppOnceKey] == NO) { // Some code you want to run on first use... [defaults setBool:YES forKey:hasRunAppOnceKey]; } The NSUserDefaults answer is the first thing that popped in my head, but upon reflection I will make another suggestion. A bit more work,

I have a little question regarding NSUserDefaults . When the application is deleted, what happens to the values stored in the NSUserDefaults ? Do they get deleted as well? When I remove a app and reinstall it from the app store the previous NSUserDefaults values are loaded? When an app is deleted from the device all local data associated with the app will be deleted too. This includes NSUserDefaults . However any data stored at an online service won't. For example, iCloud. The app will just fetch the data again if requested to do so by the user / developer. Edit As per mAu's comment below -

It's important to my app, becuase I want to store app UDID there, and Apple recommends to create app specific UDID starting from iOS 5.0. User defaults are persisted through updates but are not persisted through deleting and re-installing the app. At present, the keychain is persisted through deleting and re-installing the app, but it's not documented to be one way or the other, so relying on this behavior may be risky. You could also write the value to the iCloud key/value store. That will be persisted across all installations of the app for that user and is kind of what it was designed for.

I added a Settings bundle to my app and in Xcode it appears in the root of my project tree view. The Root.plist file looks like this: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>StringsTable</key> <string>Root</string> <key>PreferenceSpecifiers</key> <array> <dict> <key>Type</key> <string>PSGroupSpecifier</string> <key>Title</key> <string>Service</string> </dict> <dict> <key>Type</key> <string>PSTextFieldSpecifier</string> <key>Title</key> <string>Hostname</string