130 lines
4.7 KiB
Objective-C
130 lines
4.7 KiB
Objective-C
//
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// Copyright (c) 2018 Open Whisper Systems. All rights reserved.
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//
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#import "UIView+OWS.h"
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#import <SignalMessaging/OWSViewController.h>
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NS_ASSUME_NONNULL_BEGIN
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@interface OWSViewController ()
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@property (nonatomic, weak) UIView *bottomLayoutView;
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@property (nonatomic) NSLayoutConstraint *bottomLayoutConstraint;
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@end
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#pragma mark -
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@implementation OWSViewController
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- (void)dealloc
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{
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// Surface memory leaks by logging the deallocation of view controllers.
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DDLogVerbose(@"Dealloc: %@", self.class);
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[[NSNotificationCenter defaultCenter] removeObserver:self];
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}
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- (void)autoPinViewToBottomGuideOrKeyboard:(UIView *)view
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{
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OWSAssert(view);
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OWSAssert(!self.bottomLayoutConstraint);
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(keyboardWillShow:)
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name:UIKeyboardWillShowNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(keyboardDidShow:)
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name:UIKeyboardDidShowNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(keyboardWillHide:)
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name:UIKeyboardWillHideNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(keyboardDidHide:)
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name:UIKeyboardDidHideNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(keyboardWillChangeFrame:)
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name:UIKeyboardWillChangeFrameNotification
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object:nil];
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[[NSNotificationCenter defaultCenter] addObserver:self
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selector:@selector(keyboardDidChangeFrame:)
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name:UIKeyboardDidChangeFrameNotification
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object:nil];
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self.bottomLayoutView = view;
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self.bottomLayoutConstraint = [view autoPinToBottomLayoutGuideOfViewController:self withInset:0];
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}
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- (void)keyboardWillShow:(NSNotification *)notification
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{
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[self handleKeyboardNotification:notification];
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}
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- (void)keyboardDidShow:(NSNotification *)notification
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{
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[self handleKeyboardNotification:notification];
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}
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- (void)keyboardWillHide:(NSNotification *)notification
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{
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[self handleKeyboardNotification:notification];
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}
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- (void)keyboardDidHide:(NSNotification *)notification
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{
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[self handleKeyboardNotification:notification];
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}
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- (void)keyboardWillChangeFrame:(NSNotification *)notification
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{
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[self handleKeyboardNotification:notification];
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}
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- (void)keyboardDidChangeFrame:(NSNotification *)notification
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{
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[self handleKeyboardNotification:notification];
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}
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- (void)handleKeyboardNotification:(NSNotification *)notification
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{
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OWSAssertIsOnMainThread();
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if (self.shouldIgnoreKeyboardChanges) {
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return;
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}
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NSDictionary *userInfo = [notification userInfo];
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NSValue *_Nullable keyboardEndFrameValue = userInfo[UIKeyboardFrameEndUserInfoKey];
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if (!keyboardEndFrameValue) {
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OWSFail(@"%@ Missing keyboard end frame", self.logTag);
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return;
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}
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CGRect keyboardEndFrame = [keyboardEndFrameValue CGRectValue];
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CGRect keyboardEndFrameConverted = [self.view convertRect:keyboardEndFrame fromView:nil];
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// Adjust the position of the bottom view to account for the keyboard's
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// intrusion into the view.
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//
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// On iPhoneX, when no keyboard is present, we include a buffer at the bottom of the screen so the bottom view
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// clears the floating "home button". But because the keyboard includes it's own buffer, we subtract the length
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// (height) of the bottomLayoutGuide, else we'd have an unnecessary buffer between the popped keyboard and the input
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// bar.
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CGFloat offset = -MAX(0, (self.view.height - self.bottomLayoutGuide.length - keyboardEndFrameConverted.origin.y));
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// There's no need to use: [UIView animateWithDuration:...].
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// Any layout changes made during these notifications are
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// automatically animated.
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self.bottomLayoutConstraint.constant = offset;
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[self.bottomLayoutView.superview layoutIfNeeded];
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}
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@end
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NS_ASSUME_NONNULL_END
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