How iOS app data is stored (nsuserdefaults)

Source: Internet
Author: User

I. Introduction many iOS apps support preferences, primarily for storing personal confidential information. such as saving user name, password, whether automatic login and other settings, iOS provides a standard set of solutions to add preferences to the app.        Each app has a Nsuserdefaults instance that accesses preferences. Two. Code implementation APPDELEGATE.M//nsuserdefaults creation of storage  Nsuserdefaults*userdefaults = [Nsuserdefaultsstandarduserdefaults];// Create a defaults manager  [UserdefaultsSetObject:@ "123" forkey:@ "str" ];// save a string [UserdefaultsSetbool:YESforkey:@ "key" ];// bool [UserdefaultsSetinteger:10 forkey:@ "int" ];// save integer [Userdefaults synchronize];  VIEWCONTROL.M//nsuserdefaults creation value  Nsuserdefaults*userdefaults = [NsuserdefaultsStandarduserdefaults];//Create aDefaultsManager
//Take value
NSString*s = [UserdefaultsObjectforkey:@ "STR"];
bool f = [Userdefaults boolforkey:@ "key" ]; Nsinteger a = [userdefaults integerforkey:@ "int"];

How iOS app data is stored (nsuserdefaults)

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