uinavigationbar

问题 How do you make a UINavigationBar transparent ? Though I want its bar items to remain visible. 回答1: If anybody is wondering how to achieve this in iOS 7+, here's a solution (iOS 6 compatible too) In Objective-C [self.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault]; self.navigationBar.shadowImage = [UIImage new]; self.navigationBar.translucent = YES; In swift 3 (iOS 10) self.navigationBar.setBackgroundImage(UIImage(), for: .default) self.navigationBar

问题 In the new iOS7 Facebook iPhone app, when the user scrolls up the navigationBar gradually hides itself to a point where it completely vanishes. Then when the user scrolls down the navigationBar gradually shows itself. How would you implement this behavior yourself? I am aware of the following solution but it disappears right away and it isn't tied to the speed of the user's scroll gesture at all. [navigationController setNavigationBarHidden: YES animated:YES]; I hope this isn't a duplicate as

问题 In the new iOS7 Facebook iPhone app, when the user scrolls up the navigationBar gradually hides itself to a point where it completely vanishes. Then when the user scrolls down the navigationBar gradually shows itself. How would you implement this behavior yourself? I am aware of the following solution but it disappears right away and it isn't tied to the speed of the user's scroll gesture at all. [navigationController setNavigationBarHidden: YES animated:YES]; I hope this isn't a duplicate as

问题 In the new iOS7 Facebook iPhone app, when the user scrolls up the navigationBar gradually hides itself to a point where it completely vanishes. Then when the user scrolls down the navigationBar gradually shows itself. How would you implement this behavior yourself? I am aware of the following solution but it disappears right away and it isn't tied to the speed of the user's scroll gesture at all. [navigationController setNavigationBarHidden: YES animated:YES]; I hope this isn't a duplicate as

问题 Today one of our testers showed me that if he presses the back button of a navigation bar while swiping back creates a quite interesting behavior of the navigation bar: if we are on the third view controller and perform this than go back to the top, than again go in one level and click the back button on most cases the navigation bar will not disappear if it should, or it maybe will not animate. Or not appear in deeper levels. Or deactivate the back button although not being in the top view

问题 I need to update the navigation bar back button image for the whole project some sort I achieved this from the code below, But the problem is back button is showing two adjacent lines which are un wanted for me. Please guide me is there any code to remove those lines. let image = UIImage(named:"backButton") let backImage = image?.imageWithRenderingMode(.AlwaysOriginal).resizableImageWithCapInsets(UIEdgeInsetsMake(0, 13, 0, 6)) UIBarButtonItem.appearance().setBackButtonBackgroundImage

问题 I'm trying to implement an <ActionBar> that starts off with a transparent background then, as the page is scrolled a background colour is faded in. I've made some progress with this by creating a new UIView and adding it to the navigationbar. Then setting the background colour on this view based on the current scroll position. Page: <Page xmlns="http://schemas.nativescript.org/tns.xsd" loaded="pageLoaded" backgroundSpanUnderStatusBar="true"> <Page.actionBar> <ActionBar title="Page two">

问题 I'm trying to set a faded darker background to a navigation bar, as you can see on the image below. I've tried with this code but it's not exactly what I expect. UINavigationBar.appearance().backgroundColor = UIColor(red: 0, green: 0, blue: 0, alpha: 0.4) I've found this topic, but without suitable answer: Shows a faded gray color view through iOS 7 Navigation bar of a UISplitViewController Any idea will be appreciated. EDIT 6 oct 2015 : If somebody needs to know how to perform that For Swift

问题 Im trying to add a navigation bar to all view controllers inside my tabbarcontroller. Do I add the nav bar to individual view controllers... or Is there another way? 来源： https://stackoverflow.com/questions/15194526/how-to-add-a-navigation-bar-to-uitabbarcontroller

问题 Im trying to add a navigation bar to all view controllers inside my tabbarcontroller. Do I add the nav bar to individual view controllers... or Is there another way? 来源： https://stackoverflow.com/questions/15194526/how-to-add-a-navigation-bar-to-uitabbarcontroller