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+/* This file is adapted from GTScrollNavigationBar - https://github.com/luugiathuy/GTScrollNavigationBar
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+ * 3-clause BSD License
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+ *
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+ * Copyright (c) 2013, Luu Gia Thuy
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+ *
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+ * Redistribution and use in source and binary forms, with or without modification,
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+ * are permitted provided that the following conditions are met:
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+ *
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+ * * Redistributions of source code must retain the above copyright notice, this
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+ * list of conditions and the following disclaimer.
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+ *
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+ * * Redistributions in binary form must reproduce the above copyright notice, this
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+ * list of conditions and the following disclaimer in the documentation and/or
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+ * other materials provided with the distribution.
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+ *
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+ * * Neither the name of the {organization} nor the names of its
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+ * contributors may be used to endorse or promote products derived from
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+ * this software without specific prior written permission.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
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+
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+#import "GTScrollNavigationBar.h"
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+
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+#define kNearZero 0.000001f
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+
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+@interface GTScrollNavigationBar () <UIGestureRecognizerDelegate>
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+
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+@property (strong, nonatomic) UIPanGestureRecognizer* panGesture;
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+@property (assign, nonatomic) CGFloat lastContentOffsetY;
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+
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+@end
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+
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+@implementation GTScrollNavigationBar
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+
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+- (id)initWithCoder:(NSCoder *)aDecoder {
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+ self = [super initWithCoder:aDecoder];
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+ if (self) {
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+ [self setup];
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+ }
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+ return self;
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+}
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+
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+- (id)initWithFrame:(CGRect)frame
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+{
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+ self = [super initWithFrame:frame];
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+ if (self) {
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+ [self setup];
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+ }
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+ return self;
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+}
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+
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+- (void)setup
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+{
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+ self.panGesture = [[UIPanGestureRecognizer alloc] initWithTarget:self
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+ action:@selector(handlePan:)];
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+ self.panGesture.delegate = self;
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+ self.panGesture.cancelsTouchesInView = NO;
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+
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+ NSNotificationCenter *defaultCenter = [NSNotificationCenter defaultCenter];
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+
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+ [defaultCenter addObserver:self
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+ selector:@selector(applicationDidBecomeActive)
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+ name:UIApplicationDidBecomeActiveNotification
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+ object:nil];
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+
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+ [defaultCenter addObserver:self
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+ selector:@selector(statusBarOrientationDidChange)
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+ name:UIApplicationDidChangeStatusBarOrientationNotification
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+ object:nil];
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+}
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+
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+- (void)dealloc
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+{
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+ if (!SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"9.0")) {
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+ [[NSNotificationCenter defaultCenter] removeObserver:self];
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+ }
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+}
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+
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+#pragma mark - Properties
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+- (void)setScrollView:(UIScrollView*)scrollView
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+{
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+ [self resetToDefaultPositionWithAnimation:NO];
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+
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+ _scrollView = scrollView;
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+
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+ // remove gesture from current panGesture's view
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+ if (self.panGesture.view) {
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+ [self.panGesture.view removeGestureRecognizer:self.panGesture];
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+ }
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+
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+ if (scrollView) {
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+ [scrollView addGestureRecognizer:self.panGesture];
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+ }
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+}
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+
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+#pragma mark - Public methods
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+- (void)resetToDefaultPositionWithAnimation:(BOOL)animated
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+{
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+ self.scrollState = GTScrollNavigationBarStateNone;
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+ CGRect frame = self.frame;
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+ frame.origin.y = [self statusBarTopOffset];
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+ [self setFrame:frame alpha:1.0f animated:animated];
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+}
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+
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+#pragma mark - Notifications
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+- (void)statusBarOrientationDidChange
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+{
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+ [self resetToDefaultPositionWithAnimation:NO];
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+}
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+
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+- (void)applicationDidBecomeActive
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+{
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+ [self resetToDefaultPositionWithAnimation:NO];
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+}
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+
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+#pragma mark - UIGestureRecognizerDelegate
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+- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
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+shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
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+{
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+ return YES;
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+}
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+
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+#pragma mark - panGesture handler
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+- (void)handlePan:(UIPanGestureRecognizer*)gesture
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+{
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+ if (!self.scrollView || gesture.view != self.scrollView) {
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+ return;
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+ }
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+
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+ // Don't try to scroll navigation bar if there's not enough room
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+ if (self.scrollView.frame.size.height + (self.bounds.size.height * 2) >=
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+ self.scrollView.contentSize.height) {
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+ return;
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+ }
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+
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+ CGFloat contentOffsetY = self.scrollView.contentOffset.y;
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+
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+ // Reset scrollState when the gesture began
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+ if (gesture.state == UIGestureRecognizerStateBegan) {
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+ self.scrollState = GTScrollNavigationBarStateNone;
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+ self.lastContentOffsetY = contentOffsetY;
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+ return;
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+ }
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+
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+ CGFloat deltaY = contentOffsetY - self.lastContentOffsetY;
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+ if (deltaY < 0.0f) {
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+ self.scrollState = GTScrollNavigationBarStateScrollingDown;
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+ } else if (deltaY > 0.0f) {
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+ self.scrollState = GTScrollNavigationBarStateScrollingUp;
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+ }
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+
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+ CGRect frame = self.frame;
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+ CGFloat alpha = 1.0f;
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+ CGFloat maxY = [self statusBarTopOffset];
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+ CGFloat minY = maxY - CGRectGetHeight(frame) + 1.0f;
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+ // NOTE: plus 1px to prevent the navigation bar disappears in iOS < 7
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+
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+ CGFloat contentInsetTop = self.scrollView.contentInset.top;
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+ bool isBouncePastTopEdge = contentOffsetY < -contentInsetTop;
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+ if (isBouncePastTopEdge && CGRectGetMinY(frame) == maxY) {
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+ self.lastContentOffsetY = contentOffsetY;
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+ return;
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+ }
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+
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+ bool isScrolling = (self.scrollState == GTScrollNavigationBarStateScrollingUp ||
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+ self.scrollState == GTScrollNavigationBarStateScrollingDown);
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+
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+ bool gestureIsActive = (gesture.state != UIGestureRecognizerStateEnded &&
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+ gesture.state != UIGestureRecognizerStateCancelled);
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+
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+ if (isScrolling && !gestureIsActive) {
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+ // Animate navigation bar to end position
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+ if (self.scrollState == GTScrollNavigationBarStateScrollingDown) {
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+ frame.origin.y = maxY;
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+ alpha = 1.0f;
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+ }
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+ else if (self.scrollState == GTScrollNavigationBarStateScrollingUp) {
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+ frame.origin.y = minY;
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+ alpha = kNearZero;
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+ }
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+ [self setFrame:frame alpha:alpha animated:YES];
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+ }
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+ // When panning down at beginning of scrollView and the bar is expanding, do not update lastContentOffsetY
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+ if (!isBouncePastTopEdge && CGRectGetMinY(frame) == maxY) {
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+ self.lastContentOffsetY = contentOffsetY;
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+ }
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+}
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+
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+#pragma mark - helper methods
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+- (CGFloat)statusBarTopOffset
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+{
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+ CGRect statusBarFrame = [UIApplication sharedApplication].statusBarFrame;
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+ CGFloat topOffset = MIN(CGRectGetMaxX(statusBarFrame), CGRectGetMaxY(statusBarFrame));
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+ bool isInCallStatusBar = topOffset == 40.0f;
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+ if (isInCallStatusBar) {
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+ topOffset -= 20.0f;
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+ }
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+ return topOffset;
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+}
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+
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+- (void)setFrame:(CGRect)frame alpha:(CGFloat)alpha animated:(BOOL)animated
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+{
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+ if (animated) {
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+ [UIView beginAnimations:@"GTScrollNavigationBarAnimation" context:nil];
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+ }
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+
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+ CGFloat offsetY = CGRectGetMinY(frame) - CGRectGetMinY(self.frame);
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+ UIView *firstView = [self.subviews firstObject];
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+
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+ for (UIView *view in self.subviews) {
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+ bool isBackgroundView = view == firstView;
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+ bool isViewHidden = view.hidden || view.alpha == 0.0f;
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+ if (isBackgroundView || isViewHidden)
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+ continue;
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+ view.alpha = alpha;
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+ }
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+ self.frame = frame;
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+
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+
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+ if (self.scrollView) {
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+ CGRect parentViewFrame = self.scrollView.superview.frame;
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+ parentViewFrame.origin.y += offsetY;
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+ parentViewFrame.size.height -= offsetY;
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+ self.scrollView.superview.frame = parentViewFrame;
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+ }
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+
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+ if (animated) {
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+ [UIView commitAnimations];
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+ }
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+}
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+
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+@end
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+
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+@implementation UINavigationController (GTScrollNavigationBarAdditions)
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+
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+@dynamic scrollNavigationBar;
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+
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+- (GTScrollNavigationBar *)scrollNavigationBar
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+{
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+ return (GTScrollNavigationBar *)self.navigationBar;
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+}
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+
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+@end
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Soomin Lee