View not found in container hierarchy crash while adding View constraints programatically - ios

Question

Although the crash message is very clear but I have checked my code and everything seems to be looking fine. My only worry is because I am setting constraints on a view which is being set as accessory view for keyboard, could that be a reason why entire view hierarchy is not set properly.
Here is what I am doing:
Step 1: Create a custom accessory view (a number bar from 0 to 9) and put it on top of regular keyboard.
MyAccessoryView *anAccessoryView = [[MyAccessoryView alloc] initWithFrame:CGRectMake(0, 0, 320, 46.0f)];
anAccessoryView.delegate = self;
self.textField.inputAccessoryView = anAccessoryView;
Step 2: In custom accessory view (subview of UIView), add buttons and related handling. Add them to super view and then call a method after a delay of 1 second to add constraints.
- (id)initWithFrame:(CGRect)iFrame {
if (self = [super initWithFrame:iFrame]) {
[self refresh];
self.autoresizingMask = UIViewAutoresizingFlexibleWidth;
}
[self setExclusiveTouch:YES];
return self;
}
- (void)refresh {
if (!self.layoutController) {
self.layoutController = [[MyAccessoryViewLayoutController alloc] init];
}
self.backgroundColor = [self.layoutController colorForNumericInputAccessory:self];
self.userInteractionEnabled = YES;
NSMutableArray *buttonsArray = [NSMutableArray arrayWithCapacity:10];
// Adding number keys to the accessory view and setting thier properties
for (NSInteger i = 1; i < 11; i++) {
MyAccessoryViewNumericButton *aKeyboardButton = [MyAccessoryViewNumericButton buttonWithType:UIButtonTypeCustom];
aKeyboardButton.tag = i;
aKeyboardButton.frame = CGRectMake(0, 0, 32.0, 44);
[aKeyboardButton setTitle: [NSString stringWithFormat:#"%ld", (long)i % 10] forState:UIControlStateNormal];
NSString *aButtonImageTitle = [self.layoutController buttonNormalStateImageNameForIndex:(i % 10) forNumericInputAccessory:self];
[aKeyboardButton setBackgroundImage:[UIImage imageNamed:aButtonImageTitle] forState:UIControlStateNormal];
aKeyboardButton.backgroundColor = [UIColor clearColor];
[aKeyboardButton setTitleColor:[UIColor blackColor] forState: UIControlStateNormal];
[aKeyboardButton setExclusiveTouch:YES];
aKeyboardButton.titleLabel.font = [self.layoutController fontForButtonTitlesForNumericInputAccessory:self];
if (self.layoutController.interfaceIdiom == UIUserInterfaceIdiomPhone) {
aKeyboardButton.titleLabel.textAlignment = NSTextAlignmentCenter;
} else {
NSString *aButtonHighlightedImageTitle = [self.layoutController buttonHighlightedStateImageNameForIndex:(i % 10) forNumericInputAccessory:self];
[aKeyboardButton setBackgroundImage:[UIImage imageNamed:aButtonHighlightedImageTitle] forState:UIControlStateHighlighted];
}
aKeyboardButton.hidden = NO;
aKeyboardButton.enabled = YES;
aKeyboardButton.tag = i;
[aKeyboardButton addTarget:self action:#selector(buttonPressed:) forControlEvents:UIControlEventTouchUpInside];
[self addSubview:aKeyboardButton];
[buttonsArray addObject:aKeyboardButton];
if (self.layoutController.interfaceIdiom == UIUserInterfaceIdiomPhone) {
UIImage *aPressedButtonImage = [UIImage imageNamed:[self.layoutController buttonHighlightedStateImageNameForIndex:(i % 10) forNumericInputAccessory:self]];
CGRect aPressedButtonViewFrame = [self.layoutController frameForPressedButtonViewWithIndex:(i % 10) forNumericInputAccessory:self];
UIView *aPressedButtonView = [[UIView alloc] initWithFrame:aPressedButtonViewFrame];
aPressedButtonView.backgroundColor = [UIColor clearColor];
aPressedButtonView.userInteractionEnabled = YES;
aPressedButtonView.hidden = YES;
UIImageView *aPressedButtonImageView = [[UIImageView alloc] initWithImage:aPressedButtonImage];
aPressedButtonImageView.frame = CGRectMake(0.0, 0.0, aPressedButtonViewFrame.size.width, aPressedButtonViewFrame.size.height);
aPressedButtonImageView.contentMode = UIViewContentModeBottom;
aPressedButtonImageView.backgroundColor = [UIColor clearColor];
CGRect aPressedButtonLabelFrame = [self.layoutController frameForPressedButtonLabelWithIndex:(i % 10) forNumericInputAccessory:self];
UILabel *aPressedButtonLabel = [[UILabel alloc] initWithFrame:aPressedButtonLabelFrame];
aPressedButtonLabel.backgroundColor = [UIColor clearColor];
aPressedButtonLabel.text = [NSString stringWithFormat: #"%ld", (long)i % 10];
aPressedButtonLabel.textAlignment = NSTextAlignmentCenter;
aPressedButtonView.tag = i + 100;
aPressedButtonLabel.font = [UIFont fontWithName: #"Helvetica-Bold" size: 44.0f];
aPressedButtonLabel.shadowColor = [UIColor colorWithRed: 0.95f green: 0.95f blue: 0.95f alpha: 1.0f];
aPressedButtonLabel.shadowOffset = CGSizeMake(0.0f, 0.75f);
if (UIInterfaceOrientationIsLandscape([[UIApplication sharedApplication]statusBarOrientation])) {
aPressedButtonImageView.frame = CGRectMake(aPressedButtonImageView.frame.origin.x, aPressedButtonImageView.frame.origin.y - 2.0f, aPressedButtonImageView.frame.size.width, aPressedButtonImageView.frame.size.height);
}
[aPressedButtonView addSubview:aPressedButtonImageView];
[aPressedButtonView addSubview:aPressedButtonLabel];
[self addSubview:aPressedButtonView];
}
}
CALayer *aLightGreyBorder = [CALayer layer];
aLightGreyBorder.frame = CGRectMake(self.bounds.origin.x, self.bounds.origin.y + 1.0f, self.bounds.size.width, 1.0f);
UIColor *aColor = [UIColor colorWithRed:178.0f/255.0f green:184.0f/255.0f blue:191.0f/255.0f alpha:1.0f];
aLightGreyBorder.backgroundColor = [aColor CGColor];
[self.layer insertSublayer:aLightGreyBorder atIndex:0];
CALayer *aDarkGreyBorder = [CALayer layer];
aDarkGreyBorder.frame = CGRectMake(self.bounds.origin.x, self.bounds.origin.y, self.bounds.size.width, 1.0f);
UIColor *aSecondColor;
aSecondColor = [UIColor colorWithRed:100.0f/255.0f green:100.0f/255.0f blue:100.0f/255.0f alpha:1.0f];
aDarkGreyBorder.backgroundColor = [aSecondColor CGColor];
[self.layer insertSublayer:aDarkGreyBorder atIndex:0];
if (self.layoutController.interfaceIdiom == UIUserInterfaceIdiomPhone) {
for (UIView *aPressedButtonView in [self subviews]) {
if ([aPressedButtonView isMemberOfClass:[UIView class]]) {
[self bringSubviewToFront:aPressedButtonView];
}
}
}
// Now lets add constaints
[self performSelector:#selector(addConstraintsForButtons:) withObject:buttonsArray afterDelay:1.0];
}
Step 3: Add constraints to all buttons (0 to 9). Here, I am showing only first 2 buttons.
- (void)addConstraintsForButtons:(NSMutableArray *)iButtons {
// First Button
MyAccessoryViewNumericButton *firstButton = (MyAccessoryViewNumericButton *)iButtons[0];
// Left edge constraint for First button
NSLayoutConstraint *leading =[NSLayoutConstraint
constraintWithItem:firstButton
attribute:NSLayoutAttributeLeading
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeTrailing
multiplier:1.0f
constant:4.f];
[self addConstraint:leading];
// Middle in the super view
NSLayoutConstraint *vertical =[NSLayoutConstraint
constraintWithItem:firstButton
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual
toItem:self
attribute:NSLayoutAttributeCenterY
multiplier:1.0f
constant:0];
[self addConstraint:vertical];
// Width-Height Constraint for First button
[self addWHContraintForButton:firstButton];
// Second Button
MyAccessoryViewNumericButton *secondButton = (MyAccessoryViewNumericButton *)iButtons[1];
// Left edge constraint for First button
NSLayoutConstraint *secondLeading =[NSLayoutConstraint
constraintWithItem:secondButton
attribute:NSLayoutAttributeLeading
relatedBy:NSLayoutRelationEqual
toItem:firstButton
attribute:NSLayoutAttributeTrailing
multiplier:1.0f
constant:4.f];
[secondButton addConstraint:secondLeading];
// Middle in the super view
NSLayoutConstraint *secondVertical =[NSLayoutConstraint
constraintWithItem:secondButton
attribute:NSLayoutAttributeCenterY
relatedBy:NSLayoutRelationEqual
toItem:firstButton
attribute:NSLayoutAttributeCenterY
multiplier:1.0f
constant:0];
[secondButton addConstraint:secondVertical];
// Width-Height Constraint for Second button
[self addWHContraintForButton:secondButton];
// Add constaints to rest of the buttons...
}
- (void)addWHContraintForButton:(MyAccessoryViewNumericButton *)iButton {
CGFloat buttonWidth = 32.0f;
CGFloat buttonHeight = 44.0f;
// Height Constraint
NSLayoutConstraint *height = [NSLayoutConstraint
constraintWithItem:iButton
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:0
multiplier:0
constant:buttonHeight];
// Width Constraint
NSLayoutConstraint *width = [NSLayoutConstraint
constraintWithItem:iButton
attribute:NSLayoutAttributeHeight
relatedBy:NSLayoutRelationEqual
toItem:nil
attribute:0
multiplier:0
constant:buttonWidth];
[iButton addConstraint:height];
[iButton addConstraint:width];
}
But when I run this code, it crashes with following message:
View not found in container hierarchy: <MyAccessoryViewNumericButton: 0x7fb506036f90; baseClass = UIButton; frame = (0 0; 32 44); opaque = NO; tag = 1; layer = <CALayer: 0x7fb506039c70>>
That view's superview: <MyAccessoryView: 0x7fb503ddfb50; frame = (0 0; 320 46); autoresize = W; layer = <CALayer: 0x7fb503dc1fe0>>
This is what I see when debug this (tried by setting constraints in keyboardDidShow: and didMoveToSuperview methods):
(lldb) po [secondButton superview]
<MyAccessoryView: 0x7fcd6d04f6c0; frame = (0 0; 320 46); autoresize = W; layer = <CALayer: 0x7fcd6adf5ed0>>
(lldb) po [[secondButton superview] superview]
<UIInputSetHostView: 0x7fcd6d0346c0; frame = (0 522; 320 262); layer = <CALayer: 0x7fcd6adef270>>
(lldb) po [[[secondButton superview] superview] superview]
<UIInputSetContainerView: 0x7fcd6d014000; frame = (0 0; 320 568); layer = <CALayer: 0x7fcd6add78d0>>
(lldb) po [[[[secondButton superview] superview] superview] superview]
<UITextEffectsWindow: 0x7fcd6d033c30; frame = (0 0; 320 568); opaque = NO; autoresize = W+H; layer = <UIWindowLayer: 0x7fcd6d034250>>
(lldb) po [[[[[secondButton superview] superview] superview] superview] superview]
0x0000000000000000
Although view has a parent. Can someone please advise here.