Currently I'm in an AVCaptureMetadataOutputObjectsDelegate, with a storyboard created method of presenting the data to the user. However, when I call a method from another view controller to pass the data between the two, I can retrieve the data just fine and NSLog it accordingly but cannot assign or update any of the properties of the view controller at all. I.e. updating label text, moving UIView etc... Here's what the code is looking like,
- (void) retrieveObject: (ScannedItem *) object
{
if(object == NULL)
nil;
else
self.scannedObject = object;
NSLog(#"RETRIEVED IN V2: %#", self.scannedObject.itemName);
[self performSelector:#selector(animateResults:) withObject:self afterDelay:0];
}
- (void) refreshBarcode: sender
{
NSLog(#"%#", detectionString);
if(detectionString != nil)
{
[self performSelector:#selector(retrieveOnlineData:) withObject:self afterDelay:0];
}
}
- (void) animateResults: sender
{
self.productName.text = #"Hey";
if(resultsViewExpanded == YES)
{
NSLog(#"hiding");
[UIView animateWithDuration:0.5 animations:^{
self.resultsView.frame = CGRectMake(0, 531, self.resultsView.frame.size.width, self.resultsView.frame.size.height);
}];
resultsViewExpanded = NO;
}
else
{
NSLog(#"showing");
self.productName.text = [NSString stringWithFormat:#"%#", self.scannedObject.itemName];
[UIView beginAnimations:#"ShowButtons" context:nil];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[UIView setAnimationDuration:0.5];
self.resultsView.frame = CGRectMake(0, 364, self.resultsView.frame.size.width, self.resultsView.frame.size.height);
[UIView commitAnimations];
resultsViewExpanded = YES;
}
}
Ignore the horrific formatting, I have no clue what I'm doing with it. Thanks in advance for any support. :)
I think, you are updating, modifying the properties before view Load of second controller. Before View Load, if you update anything, it will not reflect, because update of properties will call after Controller navigated.
Related
My code like this:
- (void)setupSubViews {
[self addSubview:self.textView];
[self addSubview:self.sendButton];
[self.textView mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.equalTo(5);
make.bottom.equalTo(-5);
make.leading.equalTo(9);
}];
[self.sendButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.centerY.equalTo(self);
make.trailing.equalTo(-9);
make.leading.equalTo(self.textView.mas_trailing).offset(7);
make.width.equalTo(60);
make.height.equalTo(40);
}];
}
The show function to make the textView becomeFirstResponder
- (void)show {
UIWindow *keyWindow = [[UIApplication sharedApplication] keyWindow];
[keyWindow addSubview:self];
[self mas_makeConstraints:^(MASConstraintMaker *make) {
make.leading.trailing.equalTo(0);
make.bottom.equalTo(InputHeight);
}];
[self.textView becomeFirstResponder];
}
This view add to the keyWindow at the bottom of mainScreen, it's translate will changing follow the keyboard when the keyboard's frame changed.
- (void)keyboardWillChangeFrame:(NSNotification *)noti {
if (!self.textView.isFirstResponder) {
return;
}
NSValue *endFrame = noti.userInfo[#"UIKeyboardFrameEndUserInfoKey"];
CGFloat endY = [endFrame CGRectValue].origin.y;
BOOL isBackToBottom = endY == UI_SCREEN_HEIGHT;
CGFloat needOffset = endY - (UI_SCREEN_HEIGHT + InputHeight);
if (isBackToBottom) {
[UIView animateWithDuration:0.25 animations:^{
self.transform = CGAffineTransformIdentity;
} completion:^(BOOL finished) {
[self removeFromSuperview];
}];
} else {
[UIView animateWithDuration:0.25 animations:^{
self.transform = CGAffineTransformMakeTranslation(0, needOffset);
}];
}
}
Use Case:
viewController has a button, button click action like this:
- (void)beginChat {
[self.inputView show];
}
self.inputView is the above customView,
- (LiveChatInputView *)inputView {
if (!_inputView) {
_inputView = [LiveChatInputView new];
_inputView.sendBlock = ^(NSString *string) {
....
};
}
return _inputView;
}
Now my question is that when we call show function at the first time after application launched, the keyboard will not show, but call show function in second time, every thing is fine.
How to deal with this question, THX.
Calling this method is not a guarantee that the object will become the first responder.
As per Apple,
A responder object only becomes the first responder if the current
responder can resign first-responder status (canResignFirstResponder)
and the new responder can become first responder.
Try calling becomeFirstResponder like below,
[self.textView performSelector:#selector(becomeFirstResponder) withObject:nil afterDelay:0];
I made a mistake, call [self removeFromSuperview] in the function of keyboardWillChangeFrame:.
I thought UIKeyboardWillChangeFrameNotification could only post it once at the keyboard show or hide, so i put the implementation of back action in keyboardWillChangeFrame:, and controlled by endFrame.origin.y == UI_SCREEN_HEIGHT
In practice, the fact is that:
when the keyboard show, NSNotificationCenter will post UIKeyboardWillChangeFrameNotification three times:
first
second
third
Tips:
only first time show the keyboard after application launched, the first UIKeyboardWillChangeFrameNotification of above three, the endFrame.origin.y is equal to UI_SCREEN_HEIGHT
My solution:
Observer the UIKeyboardWillHideNotification, and do back action in this callback.
Thanks for all answers of this question.
There's an array with uiviews. Their frames are set due to current interfaceOrientation
Then we add these views to self.view programmatically using
-(void)placeView
{
if ([self.arrayWithViews count] > 0)
{
[UIView animateWithDuration:1.f animations:^{
UIView *currentView = [self.arrayWithViews lastObject];
[currentView setAlpha:0.f];
[self.view addSubview:currentView];
[currentView setAlpha:1.f];
[self.arrayWithViews removeLastObject];
} completion:^(BOOL finished) {
[self placeView];
}];
}
}
Now, if the orientation change happens the views keep adding (with coordinates corresponding to previous orientation).
The question is - how to stop the animation process or how to prevent interface orientation change while the animation takes place.
P.S. [self.view.layer removeAllAnimations] doesn't work (I didn't figure out why)
Could you please advise what to do?
removeAllAnimations will still call completion block, so you repeat to call placeView, so you need add a flag:
-(void)placeView
{
if(!self.runAni){ //Add a flag to stop repeat to call [self placeView]
return;
}
if ([self.arrayWithViews count] > 0)
{
[UIView animateWithDuration:1.f animations:^{
UIView *currentView = [self.arrayWithViews lastObject];
[currentView setAlpha:0.f];
[self.view addSubview:currentView];
[currentView setAlpha:1.f];
[self.arrayWithViews removeLastObject];
} completion:^(BOOL finished) {
[self placeView];
}];
}
}
to stop animation, you should do :
self.runAni = NO;
[self.view.layer removeAllAnimations];
begin to do:
self.runAni = YES;
[self placeView];
I'm new to iOS, i want to update the text in ViewDidLoad() function.
This is my button function, When button is clicked animation take place and also adds the value "1" to "resultText.text"
- (IBAction)oneButton1:(id)sender {
oneBtn2.userInteractionEnabled = YES;
CGRect frame = oneBtn1.frame;
CGRect frame1 = reffButton.frame;
frame.origin.x = frame1.origin.x;
frame.origin.y = frame1.origin.y;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration: 3.0];
[UIView animateWithDuration:3.0 animations:^{
[oneBtn1 setTransform:CGAffineTransformMakeScale(.4, .4)];
} completion:^(BOOL finished) {
oneBtn1.hidden = YES;
price = [resultText.text intValue];
[resultText setText:[NSString stringWithFormat:#"%i", price+1]];
}];
oneBtn1.frame = frame;
[UIView commitAnimations];
}
Problem: The above text value is 1 but in ViewDidLoad is 0 ,
- (void)viewDidLoad
{
[super viewDidLoad];
NSLog(#"%#", resultText.text); // output is 0 instead of 1;
}
Please anyone tell me how to update the text value in ViewDidLoad function ...
ViewDidLoad calling only once when the object is creating .So you can't update the thing in ViewDidLoad.ViewDidLoad use for initialising the parameters and set the initial settings when an object creating.
This is because every time your view will load it create new object of your textField, thats why you are unable to fetch previous (because its new textField not old one).So you have to save your text some where, for example you can use NSUserDefaults
SetText
NSString *result=[NSString stringWithFormat:#"%i", price+1];
[resultText setText:];
//Also set it to NSUserDefaluts
[[NSUserDefaults standardUserDefaults] setValue:result forKey:#"key"];
[[NSUserDefaults standardUserDefaults] synchronize];
Get Text
- (void)viewDidLoad
{
[resultText setText:[[NSUserDefaults standardUserDefaults] valueForKey:#"key"]];
NSLog(#"%#", resultText.text);
}
EDIT
You can make animation afterButton click, so call this method in button click event
-(void)animateImage
{
if ([resultText.text isEqualToString:#"3"]) {
//make your animation
}
}
You can use a method to do that
- (void)updateLabel {
oneBtn2.userInteractionEnabled = YES;
CGRect frame = oneBtn1.frame;
CGRect frame1 = reffButton.frame;
frame.origin.x = frame1.origin.x;
frame.origin.y = frame1.origin.y;
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration: 3.0];
[UIView animateWithDuration:3.0 animations:^{
[oneBtn1 setTransform:CGAffineTransformMakeScale(.4, .4)];
} completion:^(BOOL finished) {
oneBtn1.hidden = YES;
price = [resultText.text intValue];
[resultText setText:[NSString stringWithFormat:#"%i", price+1]];
}];
oneBtn1.frame = frame;
[UIView commitAnimations];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self updateLabel];
NSLog(#"%#", resultText.text); // output is 0 instead of 1;
}
I have a UIViewController and a Category for adding methods to the UIViewController. There is a method in the category:
#implementation UIViewController (AlertAnimationsAndModalViews)
-(void)someAddedMethod
{
UIView *someView;
//do some animation with the view that lasts 3 seconds
//remove the view and return
}
And in any view controller i can call this method
[self someAddedMethod];
However, i only want to allow this method to run one at a time. For example, if i make two calls one after the other
[self someAddedMethod];//call1
[self someAddedMethod];//call2
i want the second call to wait until the first call has completed. I understand that UIView animationWithduration... is run in a seperate thread, and seeing as i cant create iVars in the category i cant really use #synchronized(someObject)..
Any advice?
Thanks in advance!
EDIT
The method looks like this:
-(void)showTopBannerWithHeight:(CGFloat)height andWidth:(CGFloat)width andMessage:(NSString *)message andDuration:(CGFloat)duration
{
UILabel *messageLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, -height, width, height)];
[self.view.superview addSubview:messageLabel];
[UIView animateWithDuration:0.5
delay:0
options: UIViewAnimationOptionBeginFromCurrentState
animations:^{
messageLabel.frame = CGRectMake(0, 0, SCREEN_WIDTH, height);
}
completion:^(BOOL finished){
[UIView animateWithDuration: 0.5
delay:duration
options: UIViewAnimationOptionBeginFromCurrentState
animations:^{
messageLabel.frame = CGRectMake(0, -height, SCREEN_WIDTH, height);
}
completion:^(BOOL finished){
[messageLabel removeFromSuperview];
}];
}];
}
So i show a "banner" from the top of the screen, wait for a duration (CGFloat) then slide the view out of the screen and remove. As this is in a category i can't add instance variables..
so what i want to achieve is that if more than one call to this method is made, i want the first call to execute without waiting, but each call after that to wait until the previous call has finished.
If its just about the animations you may check if ([someView.layer animationForKey:#"sameKeyAsOnCreation"] == nil). Than you will only add an animation, if it is not currently runnning.
You could also use associated objects to store the state on your own (animation running / not running).
Assuming you want to start next animation after previous one has finished.
This way you can use some shared NSMutableArray* _animationQueue storage:
-(void)someAddedMethod
{
NSTimeInterval duration = 3.0;
void (^animationBlock)() = ^{
//do some animations here
self.view.frame = CGRectOffset(self.view.frame, 40, 0);
};
__block void (^completionBlock)(BOOL) = ^(BOOL finished){
[_animationQueue removeObjectAtIndex:0];
if([_animationQueue count]>0) {
[UIView animateWithDuration:duration animations:_animationQueue[0] completion:completionBlock];
}
};
[_animationQueue addObject:animationBlock];
if([_animationQueue count]==1) {
[UIView animateWithDuration:duration animations:animationBlock completion:completionBlock];
}
}
Note, you don't need any #synchronized features since everything goes on main thread.
UPDATE: the code below does exactly you need:
-(void)showTopBannerWithHeight:(CGFloat)height andWidth:(CGFloat)width andMessage:(NSString *)message andDuration:(CGFloat)duration
{
static NSMutableArray* animationQueue = nil;
if(!animationQueue) {
animationQueue = [[NSMutableArray alloc] init];
}
void (^showMessageBlock)() = ^{
UILabel *messageLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, width, height)];
messageLabel.text = message;
[self.view.superview addSubview:messageLabel];
[UIView animateWithDuration: 0.5
delay:duration
options:UIViewAnimationOptionBeginFromCurrentState
animations:^{
messageLabel.frame = CGRectOffset(messageLabel.frame, 0, -height);
}
completion:^(BOOL finished){
[messageLabel removeFromSuperview];
[animationQueue removeObjectAtIndex:0];
if([animationQueue count]>0) {
void (^nextAction)() = [animationQueue objectAtIndex:0];
nextAction();
}
}];
};
[animationQueue addObject:showMessageBlock];
if([animationQueue count]==1) {
showMessageBlock();
}
}
Try to use this one.And used self in #synchronized directive.
- (void)criticalMethod {
#synchronized(self) {
// Critical code.
}
}
Note: The #synchronized() directive takes as its only argument any Objective-C object, including self. This object is known as a mutual exclusion semaphore or mutex. It allows a thread to lock a section of code to prevent its use by other threads.
I have implemented SASlideMenu for side menu and is excellent everything except one thing. I don't know how to send object.
Here is switching view happening:
-(void) switchToContentViewController:(UIViewController*) content{
CGRect bounds = self.view.bounds;
if (selectedContent) {
//Animate out the currently selected UIViewController
[UIView animateWithDuration:kSlideOutInterval delay:0.0 options:UIViewAnimationCurveEaseInOut animations:^{
selectedContent.view.frame = CGRectMake(bounds.size.width,0,bounds.size.width,bounds.size.height);
} completion:
^(BOOL completed) {
[selectedContent willMoveToParentViewController:nil];
[selectedContent.view removeFromSuperview];
[selectedContent removeFromParentViewController];
content.view.frame = CGRectMake(bounds.size.width,0,0,bounds.size.height);
[self addChildViewController:content];
[self.view addSubview:content.view];
[UIView animateWithDuration:kSlideInInterval delay:0.0 options:UIViewAnimationCurveEaseInOut animations:^{
content.view.frame = CGRectMake(0,0,bounds.size.width,bounds.size.height);
} completion:^(BOOL completed){
selectedContent = content;
[content didMoveToParentViewController:self];
[self.shield removeFromSuperview];
}];
}];
}else{
[self addChildViewController:content];
[self.view addSubview:content.view];
content.view.frame = CGRectMake(0,0,bounds.size.width,bounds.size.height);
selectedContent = content;
[self.shield removeFromSuperview];
[content didMoveToParentViewController:self];
}
}
and what I want is here to get identifier (NSString) (that I will know how to solve) and then send to this new view controller which will be open.
How can I do that?
You can use a subclass of UIViewController instead of the stock UIViewController class for your "content" view controller. On this subclass, you can add a
#property (strong, nonatomic) NSString *stringForContentView;
Then, just above the line where you add the "content" view controller as a child of your current view controller,
content.stringForContentView = #"A string that you already have";