126 lines
4.5 KiB
Objective-C
126 lines
4.5 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 "Theme.h"
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#import "UIColor+OWS.h"
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#import "UIView+OWS.h"
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#import "UIViewController+OWS.h"
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#import <SignalCoreKit/iOSVersions.h>
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#import <SignalServiceKit/AppContext.h>
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NS_ASSUME_NONNULL_BEGIN
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@implementation UIViewController (OWS)
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- (UIViewController *)findFrontmostViewController:(BOOL)ignoringAlerts
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{
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UIViewController *viewController = self;
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while (YES) {
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UIViewController *_Nullable nextViewController = viewController.presentedViewController;
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if (nextViewController) {
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if (ignoringAlerts) {
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if ([nextViewController isKindOfClass:[UIAlertController class]]) {
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break;
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}
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}
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viewController = nextViewController;
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} else if ([viewController isKindOfClass:[UINavigationController class]]) {
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UINavigationController *navigationController = (UINavigationController *)viewController;
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if (navigationController.topViewController) {
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viewController = navigationController.topViewController;
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} else {
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break;
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}
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} else {
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break;
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}
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}
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return viewController;
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}
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- (UIBarButtonItem *)createOWSBackButton
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{
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return [self createOWSBackButtonWithTarget:self selector:@selector(backButtonPressed:)];
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}
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- (UIBarButtonItem *)createOWSBackButtonWithTarget:(id)target selector:(SEL)selector
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{
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return [[self class] createOWSBackButtonWithTarget:target selector:selector];
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}
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+ (UIBarButtonItem *)createOWSBackButtonWithTarget:(id)target selector:(SEL)selector
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{
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OWSAssertDebug(target);
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OWSAssertDebug(selector);
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UIButton *backButton = [UIButton buttonWithType:UIButtonTypeCustom];
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BOOL isRTL = CurrentAppContext().isRTL;
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// Nudge closer to the left edge to match default back button item.
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const CGFloat kExtraLeftPadding = isRTL ? +0 : -8;
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// Give some extra hit area to the back button. This is a little smaller
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// than the default back button, but makes sense for our left aligned title
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// view in the MessagesViewController
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const CGFloat kExtraRightPadding = isRTL ? -0 : +10;
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// Extra hit area above/below
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const CGFloat kExtraHeightPadding = 4;
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// Matching the default backbutton placement is tricky.
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// We can't just adjust the imageEdgeInsets on a UIBarButtonItem directly,
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// so we adjust the imageEdgeInsets on a UIButton, then wrap that
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// in a UIBarButtonItem.
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[backButton addTarget:target action:selector forControlEvents:UIControlEventTouchUpInside];
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UIImage *backImage = [[UIImage imageNamed:(isRTL ? @"NavBarBackRTL" : @"NavBarBack")]
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imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
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OWSAssertDebug(backImage);
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[backButton setImage:backImage forState:UIControlStateNormal];
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backButton.tintColor = Theme.navbarIconColor;
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backButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
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// Default back button is 1.5 pixel lower than our extracted image.
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const CGFloat kTopInsetPadding = 1.5;
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backButton.imageEdgeInsets = UIEdgeInsetsMake(kTopInsetPadding, kExtraLeftPadding, 0, 0);
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CGRect buttonFrame
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= CGRectMake(0, 0, backImage.size.width + kExtraRightPadding, backImage.size.height + kExtraHeightPadding);
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backButton.frame = buttonFrame;
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if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(11, 1)) {
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// In iOS 11.1 beta, the hot area of custom bar button items is _only_
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// the bounds of the custom view, making them very hard to hit.
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//
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// TODO: Remove this hack if the bug is fixed in iOS 11.1 by the time
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// it goes to production (or in a later release),
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// since it has two negative side effects: 1) the layout of the
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// back button isn't consistent with the iOS default back buttons
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// 2) we can't add the unread count badge to the back button
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// with this hack.
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return [[UIBarButtonItem alloc] initWithImage:backImage
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style:UIBarButtonItemStylePlain
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target:target
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action:selector];
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}
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UIBarButtonItem *backItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];
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backItem.width = buttonFrame.size.width;
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return backItem;
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}
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#pragma mark - Event Handling
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- (void)backButtonPressed:(id)sender
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{
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[self.navigationController popViewControllerAnimated:YES];
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}
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@end
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NS_ASSUME_NONNULL_END
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