I've been trying to obscure data when the application enters the background state by hiding it in the task switcher.
here is my AppDelegate.h file
#interface AppDelegate : UIResponder
<
UIApplicationDelegate,
MemberServicesManagerDelegate
>
{
UIWindow* window;
Reachability* reachbility;
}
#property(nonatomic, strong) UIViewController *mainViewController;
#end
This is my AppDelegate.m file
- (BOOL)application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions
{ window = [[UIWindow alloc] initWithFrame:UIScreen.mainScreen.bounds];
window.rootViewController = StartupController.instance.startingViewController;
if(DEVICE == IPAD){
self.mainViewController = window.rootViewController.childViewControllers[0];
}
[window makeKeyAndVisible];
}
- (void)applicationDidEnterBackground:(UIApplication *)application
{
//1
//self.window.hidden = YES;
//2
//UIViewController *image = [UIViewController new];
//image.view.backgroundColor = [UIColor blackColor];
//[window makeKeyAndVisible];
//[window.rootViewController presentViewController:image animated:NO completion:NULL];
//3
UIView *colourView = [[UIView alloc]initWithFrame:window.frame];
colourView.backgroundColor = [UIColor blackColor];
colourView.tag = 1234;
colourView.alpha = 0;
[window addSubview:colourView];
[window bringSubviewToFront:colourView];
[UIView animateWithDuration:0.5 animations:^{
colourView.alpha = 1;
}];
NSLog(#"BACK");
}
- (void)applicationWillEnterForeground:(UIApplication *)application
{
//1
//self.window.hidden = NO;
//2
//[window.rootViewController dismissViewControllerAnimated:NO completion:NO];
//3
UIView *colourView = [window viewWithTag:1234];
[UIView animateWithDuration:0.5 animations:^{
colourView.alpha = 0;
} completion:^(BOOL finished) {
[colourView removeFromSuperview];
}];
NSLog(#"ForeGround");
}
I tried these 3 implementations but It won't hide the view when I enter the multitask switcher.
I tried this with both simulator and real device but it still won't work. Can you help me with this?
Try doing it in applicationWillResignActive
applicationDidEnterBackground is apparently too late and the system has already made a screenshot for the task switcher.
More about application lifecycle
Related
i am on macOS, objective-c, not iOS. XCode 12.
In a lot of views i set colors like this:
self.menuIconBar.wantsLayer = YES;
self.menuIconBar.layer.backgroundColor = [NSColor colorNamed:#"color_gradient_right"].CGColor;
Whenever the user changes the Appeareance, e.g. to Dark mode, i expect my colors to change according to the Asset setup:
Unfortunately, nothing happens. BUT: The same color applied in IB directly changes as expected. Still i'd need them to change programmatically too.
Then i tried to hook on notifications:
[[NSDistributedNotificationCenter defaultCenter] addObserver:self selector:#selector(appleInterfaceThemeChangedNotification:) name:#"AppleInterfaceThemeChangedNotification" object:nil];
I receive the notifications, but when i then call the same code like above again, still the wrong color is loaded.
self.menuIconBar.layer.backgroundColor = [NSColor colorNamed:#"color_gradient_right"].CGColor;
Any help appreciated
The following example will change the background color of a custom view depending on the Appearance setting in System Preferences. It may be run in Xcode by creating an objc project, deleting the pre-existing App Delegate, and replacing the code in 'main.m' with the code below:
#import <Cocoa/Cocoa.h>
#interface CustomView : NSView
#end
#implementation CustomView
- (id)initWithFrame:(NSRect)frameRect {
if ((self = [super initWithFrame:frameRect]) != nil) {
// Add initialization code here
}
return self;
}
- (void)drawRect:(NSRect)rect {
}
- (void)viewDidChangeEffectiveAppearance {
NSLog (#"appearance did change.");
NSAppearance *changedAppearance = NSApp.effectiveAppearance;
NSAppearanceName newAppearance = [changedAppearance bestMatchFromAppearancesWithNames:#[NSAppearanceNameAqua, NSAppearanceNameDarkAqua]];
NSLog (#"new appearance name = %#", newAppearance);
if([newAppearance isEqualToString:NSAppearanceNameDarkAqua]){
[[self layer] setBackgroundColor:CGColorCreateGenericRGB( 1.0, 0.0, 0.0, 1.0 )];
} else {
[[self layer] setBackgroundColor:CGColorCreateGenericRGB( 0.0, 0.0, 1.0, 1.0 )];
}
}
// Use this if you want 0,0 (origin) to be top, left
// Otherwise origin will be at bottom, left (Unflipped)
-(BOOL)isFlipped {
return YES;
}
#end
#interface AppDelegate : NSObject <NSApplicationDelegate> {
NSWindow *window;
}
- (void) buildMenu;
- (void) buildWindow;
#end
#implementation AppDelegate
- (void) buildMenu {
NSMenu *menubar = [NSMenu new];
NSMenuItem *menuBarItem = [NSMenuItem new];
[menubar addItem:menuBarItem];
[NSApp setMainMenu:menubar];
NSMenu *appMenu = [NSMenu new];
NSMenuItem *quitMenuItem = [[NSMenuItem alloc] initWithTitle:#"Quit"
action:#selector(terminate:) keyEquivalent:#"q"];
[appMenu addItem:quitMenuItem];
[menuBarItem setSubmenu:appMenu];
}
- (void) buildWindow {
#define _wndW 600
#define _wndH 550
window = [[NSWindow alloc] initWithContentRect: NSMakeRect( 0, 0, _wndW, _wndH )
styleMask: NSWindowStyleMaskTitled | NSWindowStyleMaskMiniaturizable | NSWindowStyleMaskClosable
backing: NSBackingStoreBuffered defer: NO];
[window center];
[window setTitle: #"Test window"];
[window makeKeyAndOrderFront: nil];
// **** CustomView **** //
CustomView *view = [[CustomView alloc]initWithFrame:NSMakeRect( 20, 60, _wndW - 40, _wndH - 80 )];
[view setWantsLayer:YES];
[[view layer] setBackgroundColor:CGColorCreateGenericRGB( 0.0, 0.0, 1.0, 1.0 )];
[[window contentView] addSubview:view];
// **** Quit btn **** //
NSButton *quitBtn = [[NSButton alloc]initWithFrame:NSMakeRect( _wndW - 50, 10, 40, 40 )];
[quitBtn setBezelStyle:NSBezelStyleCircular ];
[quitBtn setTitle: #"Q" ];
[quitBtn setAction:#selector(terminate:)];
[[window contentView] addSubview: quitBtn];
}
- (void) applicationWillFinishLaunching: (NSNotification *)notification {
[self buildMenu];
[self buildWindow];
}
- (void) applicationDidFinishLaunching: (NSNotification *)notification {
}
#end
int main() {
NSApplication *application = [NSApplication sharedApplication];
AppDelegate *appDelegate = [[AppDelegate alloc] init];
[application setDelegate:appDelegate];
[application run];
return 0;
}
This worked for me in my NSView subclass:
- (void)awakeFromNib {
self.wantsLayer = YES;// might be unnecessary
}
- (void)viewDidChangeEffectiveAppearance {
self.needsDisplay = YES;
}
- (void)updateLayer {
self.layer.backgroundColor = NSColor.unemphasizedSelectedContentBackgroundColor.CGColor;
}
As of macOS 11 one should use the performAsCurrentDrawingAppearance: instance method and add anything to apply after an appearance change into the given block.
I need to perform a blinking effect on a image once the user click on a particular button. But my code doesn't work:
- (void)next
{
[UIView animateWithDuration:2.0f delay:0 options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat animations:^{
NSLog(#"Done"); // <- USED AS COUNTER
[image setAlpha:0];
[image setAlpha:0.5];
} completion:nil];
}
What happens is my image changing its alpha to 0.5 and stops. Furthermore my console shows DONE just one time. What did I wrong?
I just created a test project and this blinked just fine...
#import "ViewController.h"
#interface ViewController ()
#property (nonatomic, strong)UIView *blinker;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.blinker = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
self.blinker.backgroundColor = [UIColor greenColor];
[self.view addSubview:self.blinker];
[self next];
}
- (void)next
{
[UIView animateWithDuration:2.0f delay:0 options:UIViewAnimationOptionAutoreverse | UIViewAnimationOptionRepeat animations:^{
NSLog(#"Done"); // <- USED AS COUNTER
[self.blinker setAlpha:0];
[self.blinker setAlpha:0.5];
} completion:nil];
}
With the exception that you expect the log to continue to print out in the console. So I suspect you are doing something to your image. You aren't calling self. so I am guessing it is an instance variable (ivar) and you are changing what it points to somewhere else in the code.
If you need a counter to go off every blink you may want to consider something like this...
#import "ViewController.h"
#interface ViewController ()
#property (nonatomic, strong)UIView *blinker;
#property (nonatomic,)NSInteger counter;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.blinker = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 100, 100)];
self.blinker.backgroundColor = [UIColor greenColor];
[self.view addSubview:self.blinker];
[self next];
}
- (void)next
{
[UIView animateWithDuration:1.0 animations:^{
self.counter++;
NSLog(#"Counter: %#", #(self.counter));
self.blinker.alpha = 0.0;
} completion:^(BOOL finished) {
[UIView animateWithDuration:1.0 animations:^{
self.blinker.alpha = 1.0;
} completion:^(BOOL finished) {
//check to see if you want to continue blinking if so call next again
[self next];
}];
}];
}
I don't have any context as to why you want to count, but hopefully that helps.
I have an UIImageView in a UITableviewCell. When it is tapped, the UIImageView should animated to be displayed fullscreen. When the image is tapped when it is fullscreen it should shrink back to the original position.
How can this be achieved?
Add a gesture recognizer to the view controller.
Add the gesture Recognizer to your header file
#interface viewController : UIViewController <UIGestureRecognizerDelegate>{
UITapGestureRecognizer *tap;
BOOL isFullScreen;
CGRect prevFrame;
}
In your viewDidLoad add this:
isFullScreen = false;
tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(imgToFullScreen)];
tap.delegate = self;
Add the following delegatemethod:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch;
{
BOOL shouldReceiveTouch = YES;
if (gestureRecognizer == tap) {
shouldReceiveTouch = (touch.view == yourImageView);
}
return shouldReceiveTouch;
}
Now you just need to implement your imgToFullScreen method.
Make sure you work with the isFullScreen Bool (fullscreen if it is false and back to old size if it's true)
The imgToFullScreen method depends on how you want to make the image become fullscreen.
One way would be:
(this is untested but should work)
-(void)imgToFullScreen{
if (!isFullScreen) {
[UIView animateWithDuration:0.5 delay:0 options:0 animations:^{
//save previous frame
prevFrame = yourImageView.frame;
[yourImageView setFrame:[[UIScreen mainScreen] bounds]];
}completion:^(BOOL finished){
isFullScreen = true;
}];
return;
} else {
[UIView animateWithDuration:0.5 delay:0 options:0 animations:^{
[yourImageView setFrame:prevFrame];
}completion:^(BOOL finished){
isFullScreen = false;
}];
return;
}
}
The code from #AzzUrr1, small error corrections (brackets) and tapper implemented slightly different.
Worked for me. Now it would be great to have this implemented with a scrollView, that the user can zoom in/out if the picture is bigger.. Any suggestion?
ViewController.h
#import <UIKit/UIKit.h>
#interface ViewController : UIViewController <UIGestureRecognizerDelegate>{
UITapGestureRecognizer *tap;
BOOL isFullScreen;
CGRect prevFrame;
}
#property (nonatomic, strong) UIImageView *imageView;
#end
ViewController.m
#import "ViewController.h"
#interface ViewController ()
#end
#implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
isFullScreen = FALSE;
tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(imgToFullScreen)];
tap.delegate = self;
self.view.backgroundColor = [UIColor purpleColor];
_imageView = [[UIImageView alloc] initWithFrame:CGRectMake(10, 10, 300, 200)];
_imageView.contentMode = UIViewContentModeScaleAspectFill;
[_imageView setClipsToBounds:YES];
_imageView.userInteractionEnabled = YES;
_imageView.image = [UIImage imageNamed:#"Muppetshow-2.png"];
UITapGestureRecognizer *tapper = [[UITapGestureRecognizer alloc] initWithTarget:self action:#selector(imgToFullScreen:)];
tapper.numberOfTapsRequired = 1;
[_imageView addGestureRecognizer:tapper];
[self.view addSubview:_imageView];
}
-(void)imgToFullScreen:(UITapGestureRecognizer*)sender {
if (!isFullScreen) {
[UIView animateWithDuration:0.5 delay:0 options:0 animations:^{
//save previous frame
prevFrame = _imageView.frame;
[_imageView setFrame:[[UIScreen mainScreen] bounds]];
}completion:^(BOOL finished){
isFullScreen = TRUE;
}];
return;
}
else{
[UIView animateWithDuration:0.5 delay:0 options:0 animations:^{
[_imageView setFrame:prevFrame];
}completion:^(BOOL finished){
isFullScreen = FALSE;
}];
return;
}
}
I ended up using MHFacebookImageViewer. Integration is easy, no subclassing UIImageView, and it also has image zooming and flick dismiss.
Although it requires AFNetworking (for loading larger image from URL), you can comment out some code (about 10 lines) to remove this dependency. I can post my AFNetworking-free version if someone needs it. Let me know :)
One possible implementation would be to use a modal view controller with UIModalPresentationFullScreen presentation style.
Just finished a version in swift, just download and add into your project:
GSSimpleImageView.swift
And usage:
let imageView = GSSimpleImageView(frame: CGRectMake(20, 100, 200, 200))
imageView.image = UIImage(named: "test2.png")
self.view.addSubview(imageView)
I have a really strange UI glitch in my iPhone/iPad app. Because I wanted to find the cause of it, I created a new project with as little code as possible. The important code is below.
Basically, I have a UISplitViewController containing two UIViewController subclasses. When a button is tapped, the first one presents modally and as UIModalPresentationFormSheet a UIViewController subclass called Modal. In there, when a button is tapped, another UIViewController subclass called Text is presented, this time as UIModalPresentationFullScreen. In Text, there is a UITextView. When it is tapped, everything is alright, but when the iPad is rotated, I get this:
The white part is the Text view controller, the red part in the background is ViewControllerTwo.
Does anybody have any idea why this happens? And what I can do to fix it?
Here is the Project: MediaFire
Here is the relevant source code:
// AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
ViewControllerOne *one = [[ViewControllerOne alloc] init];
ViewControllerTwo *two = [[ViewControllerTwo alloc] init];
UISplitViewController *split = [[UISplitViewController alloc] init];
split.viewControllers = [NSArray arrayWithObjects:one, two, nil];
self.window.rootViewController = split;
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
return YES;
}
// ViewControllerOne.m
#import "Modal.h"
#implementation ViewControllerOne
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor blueColor];
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(30, 30, 44, 44);
[button addTarget:self action:#selector(buttonTapped) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)buttonTapped
{
Modal *modalOne = [[Modal alloc] init];
modalOne.modalPresentationStyle = UIModalPresentationFormSheet;
[self presentModalViewController:modalOne animated:YES];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
// Modal.m
#import "Text.h"
#implementation Modal
- (void)viewDidLoad
{
[super viewDidLoad];
UIButton *buttonOne = [UIButton buttonWithType:UIButtonTypeRoundedRect];
buttonOne.frame = CGRectMake(30, 30, 44, 44);
buttonOne.tag = 1;
[buttonOne addTarget:self action:#selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];
UIButton *buttonTwo = [UIButton buttonWithType:UIButtonTypeRoundedRect];
buttonTwo.frame = CGRectMake(30, 100, 44, 44);
buttonTwo.tag = 2;
[buttonTwo addTarget:self action:#selector(buttonTapped:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:buttonOne];
[self.view addSubview:buttonTwo];
}
- (void)buttonTapped:(UIButton *)button
{
if (button.tag == 1)
{
Text *text = [[Text alloc] init];
text.modalPresentationStyle = UIModalPresentationFullScreen;
[self presentModalViewController:text animated:YES];
}
else
{
[self dismissModalViewControllerAnimated:YES];
}
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
// Text.m
#implementation Text
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor greenColor];
UITextView *textView = [[UITextView alloc] initWithFrame:self.view.bounds];
textView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[self.view addSubview:textView];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return YES;
}
You may need to present the modal views from the UISplitViewController instead of it's subviews...
UISplitViewController *splitViewController = [(AppDelegate *)[[UIApplication sharedApplication] delegate] splitViewController];
[splitViewController presentModalViewController:modal animated:YES];
I am trying to add an activity indicator during startup. I did have a launch image, but I'd rather have just an indicator alone. I added the following to my app delegate, but the indicator doesn't appear.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// *******Create activity indicator****
UIActivityIndicatorView *activity = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(225, 115, 30, 30)];
[activity setBackgroundColor:[UIColor clearColor]];
[activity setActivityIndicatorViewStyle: UIActivityIndicatorViewStyleGray];
[window addSubview: activity];
[activity release];
[activity startAnimating];
activity.hidden = FALSE;
// *******End activity indicator****
MainViewController *viewController = [[MainViewController alloc] initWithNibName:#"MainView" bundle:nil];
self.mainViewController = viewController;
[window addSubview:[mainViewController view]];
mainViewController.view.frame = CGRectMake(0, 20, 320, 411);
[window addSubview:[rootController view]];
[window makeKeyAndVisible];
#if !TARGET_IPHONE_SIMULATOR
[application registerForRemoteNotificationTypes:
UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeSound];
#endif
application.applicationIconBadgeNumber = 0;
// Hide indicator
[viewController release];
activity.hidden = TRUE;
[activity stopAnimating];
return YES;
}
I visited this question from back in 2009, but the solution didn't work for me.
iPhone-SDK:Activity Indicator during Startup?
For all those who needed this, and i know there were many...
(Made on Xcode version 4.2.1)
So...
In the AppDelegate.h add this:
#property (nonatomic, strong) UIImageView *splashView;
In the AppDelegate.m add this:
On the top of the page of cours #synthesize splashView;
And then:
- (void) splashFade
{
splashView = [[UIImageView alloc] initWithFrame:CGRectMake(0,0, 320, 480)];
splashView.image = [UIImage imageNamed:#"Default.png"];
[_window addSubview:splashView];
[_window bringSubviewToFront:splashView];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:2.0];
[UIView setAnimationDelay:2.5];
[UIView setAnimationTransition:UIViewAnimationTransitionNone forView:_window cache:YES];
[UIView setAnimationDelegate:self];
[UIView setAnimationDidStopSelector:#selector(startupAnimationDone:finished:context:)];
splashView.alpha = 0.0;
[UIView commitAnimations];
//Create and add the Activity Indicator to splashView
UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
activityIndicator.alpha = 1.0;
activityIndicator.center = CGPointMake(160, 360);
activityIndicator.hidesWhenStopped = NO;
[splashView addSubview:activityIndicator];
[activityIndicator startAnimating];
}
- (void)startupAnimationDone:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context
{
[splashView removeFromSuperview];
}
The [UIView setAnimationDelay:2.5] is responsible for how long the splashView will be in front by the delay time you choose.
You can change the position of the indicator by changing the nubmers of x/y in:
activityIndicator.center = CGPointMake(160, 360);
At last, under the methode:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
Just add this:
[self performSelector:#selector(splashFade) withObject:nil];
And there you go :)
Hope it helped.
Have a nice programming....
I don't think this is possible from looking at the docs for UIApplicationDelegate
The earliest your app is called is in
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
Which as the name suggests is when your app hasFinishedLaunching
The reason nothing happens when you show and hide the indicator is to do with threading. The user interface will only update at the end of your method where the net result of your changes will be that the indicator is hidden.
Another solution is to let the launchimage load and when your ViewController loads at the viewDidLoad, use overlay + indicator on top of your view with alpha below 1:
UIView *baseView = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
[self.view addSubview:baseView];
[baseView setBackgroundColor:[UIColor blackColor]];
baseView.userInteractionEnabled = NO;
baseView.alpha = 0.4;
UIActivityIndicatorView *indicator = [[UIActivityIndicatorView alloc]initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
indicator.frame = CGRectMake(0.0, 0.0, 40.0, 40.0);
indicator.center = self.view.center;
[self.view addSubview:indicator];
[indicator bringSubviewToFront:self.view];
[indicator startAnimating];
Now comes the fun part, use delegate to remove the indicator + overlay when all your background threads finish to load up and simple call a method via your delegate:
- (void) onFinishLoading{
[indicator stopAnimating];
[baseView removeFromSuperview];
}
In order to stopAnimation and removeFromSuperView you might want to make baseView and indicator property + #synthesize
This isn't possible (as #Paul.S is saying). However, you can simulate this by adding a (static, so it's not animating) Default.png-splash-screen to your project.
In my opinion, though, you should rather invest in a better performance. For example: do you link your app with unused frameworks (eg. QuartzCore, MapKit) or something.
Starting an app should take 2 seconds max. At this time, you don't really need to show your user an activity-indicator. If it does take longer, you should take a look at what makes it so slow, rather than trying to hide it.