I wish to make an app that, when the user opens it for the first time he selects his country from a picker in order to make his flag appear on the main screen. If the user closes the app and opens it again I want the app to start the menu screen with his flag on it directly.
I am using the following code now but it doesn't work at all. Every time the app is opened it takes him to the picker VIew (TappViewController)
- (void)viewDidLoad
{
[super viewDidLoad];
if (![[NSUserDefaults standardUserDefaults] boolForKey:#"FirstLaunch"]) {
secViewController *menu = [[secViewController alloc] init];
[self presentViewController:menu animated:YES completion:^{
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"FirstLaunch"];
[[NSUserDefaults standardUserDefaults] synchronize];}];
}
else{
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"FirstLaunch"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
Change your code like this:
- (void)viewDidLoad
{
[super viewDidLoad];
if (![[NSUserDefaults standardUserDefaults] boolForKey:#"isPickerOpened"]) {
secViewController *menu = [[secViewController alloc] init];
[self presentViewController:menu animated:YES completion:^{
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"isPickerOpened"];
[[NSUserDefaults standardUserDefaults] synchronize];
}];
}
}
Related
I have setup my app to support a base internationalization for English and added a local for Spanish. I'm trying to provide an option to force the app to use a locale select by the user via a segmented control.
What I would like to do is have the screen "refresh" or "redraw" with the new selected locale.
Here is my action for the segmented control:
- (IBAction)segmentSwitch:(id)sender {
UISegmentedControl *segmentedControl = (UISegmentedControl *) sender;
NSInteger selectedSegment = segmentedControl.selectedSegmentIndex;
NSUserDefaults *prefs;
prefs = [NSUserDefaults standardUserDefaults];
if (selectedSegment == 0) {
[prefs setObject:#"en" forKey:#"language"];
[[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObjects:#"en", nil] forKey:#"AppleLanguages"];
[[NSUserDefaults standardUserDefaults] synchronize];
NSLog(#"English");
}
else
{
[prefs setObject:#"es" forKey:#"language"];
[[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObjects:#"es", nil] forKey:#"AppleLanguages"];
[[NSUserDefaults standardUserDefaults] synchronize];
NSLog(#"Spanish");
}
[self.view setNeedsDisplay];
}
My hope is that the screen would refresh and display the selected language view. If I close out the app and restart, it does display new view.
Here is my viewWillAppear:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
// get the saved language preference
NSUserDefaults *prefs;
prefs = [NSUserDefaults standardUserDefaults];
NSString *stringVal = [prefs stringForKey:#"language"];
// Make sure we have a valid value
if (stringVal != nil) {
// Set the language preference
[[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObjects:stringVal, nil] forKey:#"AppleLanguages"];
[[NSUserDefaults standardUserDefaults] synchronize]; //to make the change immediate
// Turn on the appropriate segment
if ([stringVal isEqual: #"en"]) {
NSLog(#"English");
languageSwitch.selectedSegmentIndex = 0;
} else {
NSLog(#"Spanish");
languageSwitch.selectedSegmentIndex = 1;
}
} else {
// default to English
languageSwitch.selectedSegmentIndex = 0;
[[NSUserDefaults standardUserDefaults] setObject:[NSArray arrayWithObjects:#"en", nil] forKey:#"AppleLanguages"];
[[NSUserDefaults standardUserDefaults] synchronize]; //to make the change immediate
}
}
I had thought that following would force a screen refresh but it doesn't seem to be working:
[self.view setNeedsDisplay];
Any thoughts or suggestions would be appreciated. Thanks in advanced.
Here the code I have under the viewController.m
This code will run when a user selects a viewController
-(void)switchViews {
UIStoryboard *mainStory = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
UIViewController *vc = [mainStory instantiateViewControllerWithIdentifier:schoolName];
[self presentModalViewController:vc animated:YES];
NSUserDefaults *defaultViewController = [NSUserDefaults standardUserDefaults];
[defaultViewController setObject:nil forKey:#"save"];
[defaultViewController synchronize];
}
This code will run on the second time the app is launched
-(void)loadNewView {
UIStoryboard *mainStory = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
NSUserDefaults *newUserDefault = [NSUserDefaults standardUserDefaults];
NSString *newVC = [NSString stringWithFormat:#"save", schoolName];
UIViewController *newViewController = [mainStory instantiateViewControllerWithIdentifier:newVC];
[self presentModalViewController:newViewController animated:YES];
}
Keeping in mind that schoolNameis a string
How can I run [self loadNewView] under the viewDidLoad but running it on the second time the app is launched?
You should do something like
id value = [[NSUserDefaults standardUserDefaults] objectForKey:#"save"];
if (value) {
UIViewController *vc = [mainStory instantiateViewControllerWithIdentifier:value];
[self presentModalViewController:vc animated:YES];
} else {
// first time logic
}
in your AppDelegate or wherever you have your navigation logic. You should not have that logic in viewDidLoad.
-(void)viewDidLoad {
[super viewDidLoad];
NSString *launchCount = #"LaunchCount";
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSInteger count;
if([userDefaults objectForKey:launchCount]) {
count = [userDefaults integerForKey:launchCount];
}
else {
count = 0;
}
count++; //increment the launch count
[userDefaults setObject:[NSNumber numberWithInt:count] forKey:launchCount];
[userDefaults synchronize];
if([userDefaults integerForKey:launchCount] >= 2) {
// Do your thang
}
}
on ViewDidLoad function do something like this
if (![[NSUserDefaults standardUserDefaults] boolForKey:#"HasLaunchedFirst"])
{
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"HasLauncheFirst"];
[[NSUserDefaults standardUserDefaults] synchronize];
[self switchViews];
}
else
{
[[NSUserDefaults standardUserDefaults] setBool:No forKey:#"HasLauncheFirst"];
[[NSUserDefaults standardUserDefaults] synchronize];
[self loadNewView];
}
I know how I can detect if the application first time opened using NSUserDefault:
BOOL didRunBefore = [[NSUserDefaults standardUserDefaults] boolForKey:#"didRunBefore"];
if (!didRunBefore) {
//Your Launch Code
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"didRunBefore"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
The Issue: I want an Alert for ever view explaining about what features it contains and only open this alert when the app is first launched?
As an OOP programmer you can make a common public method.
+ (BOOL)checkWhetherRunBefore:(NSString *)key
{
return [[NSUserDefaults standardUserDefaults] boolForKey:key];
}
+ (void)hasRunForMyClass:(NSString *)key
{
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:key];
[[NSUserDefaults standardUserDefaults] synchronize];
}
And in your ViewController , you can code in the viewWillAppear or viewDidAppear like this :
- (void)viewWillAppear
{
if(![HelpController checkWhetherRunBefore:NSStringFromClass([self class])])
{
//do your thing
[HelpController hasRunForMyClass:NSStringFromClass([self class])]
}
}
You just need to put your code in viewDidLoad
viewDidLoad will run only one time when app load your view. (except low memory)
Next time you load the view again in viewDidLoad, you can check bool didRunBefore
You can use any key you want.
In FirstViewController:
BOOL didRunBefore = [[NSUserDefaults standardUserDefaults] boolForKey:#"FirstViewController_didRunBefore"];
if (!didRunBefore) {
//Your Launch Code
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"FirstViewController_didRunBefore"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
In SecondViewController:
BOOL didRunBefore = [[NSUserDefaults standardUserDefaults] boolForKey:#"SecondViewController_didRunBefore"];
if (!didRunBefore) {
//Your Launch Code
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"SecondViewController_didRunBefore"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
yo have to need to detect application first launch, you can detect t like this
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if (![defaults objectForKey:#"firstRun"])
[defaults setObject:[NSDate date] forKey:#"firstRun"];
[[NSUserDefaults standardUserDefaults] synchronize];
You can then test for it later...
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
if([defaults objectForKey:#"firstRun"])
{
// do something or not...
}
In my Application, I have a ViewController that loads up as a welcome screen. You tap "Go" then anther ViewController appears making the user create an account. when the information is submitted, their profile appears. (This is a fun test app) I want to make it so that when the user registers, uses their profile then quits the app, they don't have to keep re-registering. So I need help detecting the apps first launch, then making the WelcomeViewController and the RegisterViewController go away after first launch.
WelcomeViewController:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
if ([[NSUserDefaults standardUserDefaults] boolForKey:#"hasLaunchedOnce"]) {
ProfileViewController *profileVC = [[ProfileViewController alloc] initWithNibName:nil bundle:nil];
[self presentViewController:profileVC animated:NO completion:nil];
} else {
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"hasLaunchedOnce"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
}
RegisterViewController:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
if ([[NSUserDefaults standardUserDefaults] boolForKey:#"hasLaunchedOnce"]) {
ProfileViewController *profileVC = [[ProfileViewController alloc] initWithNibName:nil bundle:nil];
[self presentViewController:profileVC animated:NO completion:nil];
} else {
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:#"hasLaunchedOnce"];
[[NSUserDefaults standardUserDefaults] synchronize];
}
}
NSUserDefaults is what you are looking for... store the state of the logged in user in NSUserDefaults and check/load it at the application startup...
Developing for a jailbroken device.
I've looked here for a soultion to my problem. Using NSUserDefaults for storing UISwitch state but people say alot of the codes don't work.
I'm using a UISwitch to load/unload a launch daemon for iOS. I've gotten very close but the switch state won't save. This is the code im using.
#synthesize toggleSwitch;
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
if([[NSUserDefaults standardUserDefaults] boolForKey:#"switch"]) toggleSwitch.on = [[NSUserDefaults standardUserDefaults] boolForKey:#"switch"];
}
- (void)switchValueChanged {
if (toggleSwitch.on) {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:TRUE];
switchlabel.text = #"Enabled";
const char *onchar = [[NSString stringWithString:#"launchctl load -wF /System/Library/LaunchDaemons/com.launch.daemon.plist"] UTF8String];
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:FALSE];
setuid(0); system(onchar);
if (system(onchar) == 0){
[[NSUserDefaults standardUserDefaults] setBool:self.toggleSwitch.on forKey:#"switch"];
[[NSUserDefaults standardUserDefaults] synchronize];
} else {
[[NSUserDefaults standardUserDefaults] setBool:self.toggleSwitch.on forKey:#"switch"];
[[NSUserDefaults standardUserDefaults] synchronize];
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:FALSE];}
} else {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:TRUE];
switchlabel.text = #"Disabled";
const char *offchar = [[NSString stringWithString:#"launchctl unload -wF /System/Library/LaunchDaemons/com.launch.daemon.plist"] UTF8String];
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:FALSE];
setuid(0); system(offchar);
if (system(offchar) == 0){
[[NSUserDefaults standardUserDefaults] setBool:self.toggleSwitch.on forKey:#"switch"];
[[NSUserDefaults standardUserDefaults] synchronize];
} else {
[[NSUserDefaults standardUserDefaults] setBool:self.toggleSwitch.on forKey:#"switch"];
[[NSUserDefaults standardUserDefaults] synchronize];
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:FALSE]; }
}
The bool value is written in my app plist. I don't seem to know what I did wrong. I pieced afew examples from questions on overflow with no luck. Regardless if the command fails, the switch should save.
Could someone explain and show me what should be edited. This has been driving me absolutely nuts.