Section header views adaptation to safe area insets

Signed-off-by: ismailgulek <gulekismail@gmail.com>
2026-04-20 16:42:44 +02:00 · 2020-04-21 16:26:16 +03:00
parent 79c35c3736
commit e77aceef7b
9 changed files with 549 additions and 351 deletions
@@ -0,0 +1,168 @@
+/*
+ Copyright 2014 OpenMarket Ltd
+ Copyright 2020 Vector Creations Ltd
+ 
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ 
+ http://www.apache.org/licenses/LICENSE-2.0
+ 
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+#import "SectionHeaderView.h"
+
+static const CGFloat kInterItemsSpaceHorizontal = 8.0;
+
+@implementation SectionHeaderView
+
+- (void)setMinimumLeftInset:(CGFloat)minimumLeftInset
+{
+    _minimumLeftInset = minimumLeftInset;
+    [self setNeedsLayout];
+}
+
+- (void)setMinimumRightInset:(CGFloat)minimumRightInset
+{
+    _minimumRightInset = minimumRightInset;
+    [self setNeedsLayout];
+}
+
+- (void)setTopViewHeight:(CGFloat)topViewHeight
+{
+    _topViewHeight = topViewHeight;
+    [self setNeedsLayout];
+}
+
+- (void)setTopSpanningView:(UIView *)topSpanningView
+{
+    _topSpanningView = topSpanningView;
+    [self setNeedsLayout];
+}
+
+- (void)setHeaderLabel:(UILabel *)headerLabel
+{
+    _headerLabel = headerLabel;
+    [self setNeedsLayout];
+}
+
+- (void)setAccessoryView:(UIView *)accessoryView
+{
+    _accessoryView = accessoryView;
+    [self setNeedsLayout];
+}
+
+- (void)setBottomView:(UIView *)bottomView
+{
+    _bottomView = bottomView;
+    [self setNeedsLayout];
+}
+
+- (instancetype)init
+{
+    return [self initWithFrame:CGRectZero];
+}
+
+- (instancetype)initWithFrame:(CGRect)frame
+{
+    self = [super initWithFrame:frame];
+    if (self)
+    {
+        [self setup];
+    }
+    return self;
+}
+
+- (instancetype)initWithCoder:(NSCoder *)aDecoder
+{
+    self = [super initWithCoder:aDecoder];
+    if (self)
+    {
+        [self setup];
+    }
+    return self;
+}
+
+- (void)setup
+{
+    _minimumLeftInset = 20;
+    _minimumRightInset = 16;
+    _topViewHeight = 30;
+}
+
+- (void)layoutSubviews
+{
+    [super layoutSubviews];
+
+    CGFloat _leftInset = 0.0, _rightInset = 0.0;
+    if (@available(iOS 11, *))
+    {
+        _leftInset += self.safeAreaInsets.left;
+        _rightInset += self.safeAreaInsets.right;
+    }
+
+    CGFloat leftMargin = MAX(_leftInset, _minimumLeftInset);
+    CGFloat rightMargin = MAX(_rightInset, _minimumRightInset);
+
+    if (_topSpanningView)
+    {
+        CGRect frame = self.bounds;
+        frame.size.height = _topViewHeight;
+        _topSpanningView.frame = frame;
+    }
+
+    if (_headerLabel)
+    {
+        CGRect frame = _headerLabel.frame;
+        frame.origin.x = leftMargin;
+        if (_accessoryView)
+        {
+            rightMargin += _accessoryView.frame.size.width + kInterItemsSpaceHorizontal;
+        }
+        if (_bottomView)
+        {
+            //  set header label top
+            frame.origin.y = (_topViewHeight - frame.size.height)/2;
+        }
+        else
+        {
+            //  center header label vertically
+            frame.origin.y = MAX(0, (self.bounds.size.height - frame.size.height)/2);
+        }
+        frame.size.width = self.bounds.size.width - leftMargin - rightMargin;
+        _headerLabel.frame = frame;
+    }
+
+    if (_accessoryView)
+    {
+        //  reset margins
+        leftMargin = MAX(_leftInset, 20);
+        rightMargin = MAX(_rightInset, 20);
+
+        CGRect frame = _accessoryView.frame;
+        frame.origin.x = self.bounds.size.width - frame.size.width - rightMargin;
+        frame.origin.y = MAX(0, (_topViewHeight - frame.size.height)/2);
+        _accessoryView.frame = frame;
+    }
+
+    if (_bottomView)
+    {
+        //  reset margins
+        leftMargin = MAX(_leftInset, 20);
+        rightMargin = MAX(_rightInset, 20);
+
+        CGRect frame = _bottomView.frame;
+        frame.origin.x = leftMargin;
+        frame.origin.y = CGRectGetMaxY(_headerLabel.frame);
+        frame.size.width = self.bounds.size.width - leftMargin - rightMargin;
+        frame.size.height = self.bounds.size.height - frame.origin.y;
+        _bottomView.frame = frame;
+    }
+}
+
+@end