Fixes crash caused by calling layoutIfNeeded too early, before UITa…

…bleView or UICollectionView sets up its datasource

Examples/Messenger-Shared/MessageTableViewCell.m

@@ -11,7 +11,7 @@
 
 @implementation MessageTableViewCell
 
-- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
+- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
 {
     self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
     if (self) {

Source/Classes/SLKTextInputbar.m

@@ -101,7 +101,7 @@ - (void)slk_commonInit
 
 - (void)layoutIfNeeded
 {
-    if (self.constraints.count == 0) {
+    if (self.constraints.count == 0 || !self.window) {
         return;
     }
 
@@ -274,22 +274,6 @@ - (UILabel *)charCountLabel
     return _charCountLabel;
 }
 
-- (BOOL)isViewVisible
-{
-    SEL selector = NSSelectorFromString(@"isViewVisible");
-
-    if ([self.controller respondsToSelector:selector]) {
-
-#pragma clang diagnostic push
-#pragma clang diagnostic ignored "-Warc-performSelector-leaks"
-        BOOL visible = (BOOL)[self.controller performSelector:selector];
-#pragma clang diagnostic pop
-
-        return visible;
-    }
-    return NO;
-}
-
 - (CGFloat)minimumInputbarHeight
 {
     CGFloat minimumTextViewHeight = self.textView.intrinsicContentSize.height;
@@ -329,7 +313,7 @@ - (CGFloat)slk_inputBarHeightForLines:(NSUInteger)numberOfLines
     CGFloat height = self.textView.intrinsicContentSize.height;
     height -= self.textView.font.lineHeight;
     height += roundf(self.textView.font.lineHeight*numberOfLines);
-    height += self.contentInset.top+self.contentInset.bottom;
+    height += self.contentInset.top + self.contentInset.bottom;
 
     return height;
 }
@@ -355,13 +339,15 @@ - (CGFloat)slk_appropriateRightButtonWidth
     NSString *title = [self.rightButton titleForState:UIControlStateNormal];
 
     CGSize rightButtonSize;
+
     if ([title length] == 0 && self.rightButton.imageView.image) {
         rightButtonSize = self.rightButton.imageView.image.size;
-    } else {
+    }
+    else {
         rightButtonSize = [title sizeWithAttributes:@{NSFontAttributeName: self.rightButton.titleLabel.font}];
     }
 
-    return rightButtonSize.width+self.contentInset.right;
+    return rightButtonSize.width + self.contentInset.right;
 }
 
 - (CGFloat)slk_appropriateRightButtonMargin
@@ -405,6 +391,7 @@ - (void)setAutoHideRightButton:(BOOL)hide
     _autoHideRightButton = hide;
 
     self.rightButtonWC.constant = [self slk_appropriateRightButtonWidth];
+
     [self layoutIfNeeded];
 }
 
@@ -507,6 +494,7 @@ - (void)endTextEdition
     }
 
     self.editing = NO;
+
     [self slk_updateConstraintConstants];
 }
 
@@ -570,7 +558,7 @@ - (void)slk_didChangeTextViewText:(NSNotification *)notification
 
         BOOL bounces = self.controller.bounces && [self.textView isFirstResponder];
 
-        if ([self isViewVisible]) {
+        if (self.window) {
             [self slk_animateLayoutIfNeededWithBounce:bounces
                                               options:UIViewAnimationOptionCurveEaseInOut|UIViewAnimationOptionBeginFromCurrentState
                                            animations:NULL];

Source/Classes/SLKTextView.m

@@ -396,6 +396,15 @@ - (void)setTypingSuggestionEnabled:(BOOL)enabled
 
 #pragma mark - UITextView Overrides
 
+- (void)layoutIfNeeded
+{
+    if (!self.window) {
+        return;
+    }
+
+    [super layoutIfNeeded];
+}
+
 - (NSArray *)gestureRecognizers
 {
     NSArray *gestureRecognizers = [super gestureRecognizers];