uiscrollviewdelegate

Create a button on top of UiTableView

由 泪湿孤枕 提交于 2019-12-10 21:32:50
问题 I am trying to understand how does Facebook Messenger create a button at the button of the screen which stays on top of the UITableView and follows the scrolling as well? I want to implement the blue button on the bottom right. What should be my approach to achieve something like that? Any push in the right direction will be highly appreciated. 回答1: There are a few avenues to take when adding the overlay view: As a subview of the wrapping UINavigationController , which means it won't scroll

UIScrollViews all scroll in the same time

由 给你一囗甜甜゛ 提交于 2019-12-10 10:44:50
问题 I have a screen with several scrollViews. How to achieve this: When i tap on one and swipe they all start to scroll. I of course know UIScrollViewDelegate methods and what i trying to do so far is combine -setContentOffset:animated: with scrollViewDidScroll and it works but only for one case - when i start scrolling with delegate scrollview. How to dynamically change delegate? depends which scroll view user select? 回答1: Keep an array of all of your UIScrollView objects. Make sure all of their

Objective C switch statements and named integer constants

由 只愿长相守 提交于 2019-12-09 10:06:58
问题 I have a controller which serves as a delegate to two scrollviews which are placed in view managed by aforementioned view controller. To distinguish between two scroll views I'm trying to use switch statement (instead of simple pointer comparison with if statement). I have tagged both scroll views as 0 and 1 like this NSUInteger const kFirstScrollView = 0; NSUInteger const kSecondScrollView = 1; When I try to use these constants in a switch statement, the compiler says that case statements

Status bar detects taps only when the UIWebView is scrolled down a bit

由 给你一囗甜甜゛ 提交于 2019-12-08 05:13:56
问题 I have a UIWebView as the root view of a UINavigationController . When a webpage finishes to load, I hide the navigation bar, and I'm looking for a way to show it back. Right now, I'm trying to do that when the user taps the status bar (this approach looks to me more complicated than what I want). In order to accomplish this, firstly I get the scrollView of the webView: for (id subview in mainWebView.subviews) { if ([[subview class] isSubclassOfClass: [UIScrollView class]]) { ((UIScrollView *

how to set UITableView's scroll position to previous location when click “load earlier items” button

由 走远了吗. 提交于 2019-12-08 04:34:28
问题 I have a tableView like iOS iMessage detail view. And also I've a button at the top of tableView which used by "load earlier messages". When I scrolled tableView to top, my button appears and after I clicked the button, I fill earlier records and reload tableView. While the records are repopulating in tableView, scrolls position does not change. By the way, I tried to keep scroll previous position value and setcontentoffset to previous CGPoint . But I realized that the scrollposition always

UIView not firing methods in the UIScrollView delegate

由 ◇◆丶佛笑我妖孽 提交于 2019-12-08 03:17:31
问题 I wonder if someone could please shed some light as to why any of the methods in UIScrollView delegate are not being fired. To set the scene. I have a UIViewController which is pushed onto a stack. On this view I have 5 custom tabs that I have made. On a tap of each tap I have a function with loads of 5 views (one per tab) from UIViewController/xib combo. ExercisePhotoView *exercisePhotoView = [[ExercisePhotoView alloc] initWithNibName:@"ExercisePhotoView" bundle:nil]; exercisePhotoView

iOS. How do I restrict UIScrollview scrolling to a limited extent? [duplicate]

由 余生颓废 提交于 2019-12-07 01:42:35
问题 This question already has answers here : Limiting the scrollable area in UIScrollView (4 answers) Closed 6 years ago . What is the best way to set limits on the left/right scrolling of a UIScrollView. I would have thought this would be easy but all my attempts have been unsuccessful. So, to be clear, I need a solution that will allow me to programmatically limit the scrolling extent whenever I need to during the use of my app. This will most often be in response to changes in the data being

Zooming within Nested UIScrollViews

由 a 夏天 提交于 2019-12-06 14:41:10
问题 Its a familiar topic Im creating a graphic novel using UIScrollview. The plan is to be able to page along the novel with a top level uiscrollview. Within this are a series of nested uiscrollviews which have a uimageview embedded within each. The idea is that large images can be panned around and zoomed into but still paged along. I have most of this working but I cant get the zoom working. I have implemented the zoom delegate method but to no avail, zooming just pans the image around. I

UIScrollViews all scroll in the same time

由 无人久伴 提交于 2019-12-06 07:53:10
I have a screen with several scrollViews. How to achieve this: When i tap on one and swipe they all start to scroll. I of course know UIScrollViewDelegate methods and what i trying to do so far is combine -setContentOffset:animated: with scrollViewDidScroll and it works but only for one case - when i start scrolling with delegate scrollview. How to dynamically change delegate? depends which scroll view user select? Keep an array of all of your UIScrollView objects. Make sure all of their delegates point to the same object (or if that's not possible, there is some sort of handler that gets

How can I get a UIWebView's UIScrollView delegate methods called from within a standard UIViewController?

由 风格不统一 提交于 2019-12-06 04:59:58
问题 So I just have a standard UIViewController with a UIWebView in it that displays a pdf. For the app functionality, I have need to be able to respond to the UIWebView's nested UIScrollView events like scrollViewWillBeginDragging, scrollViewDidScroll, etc. The only way I can get access to the scrollView is to (it seems like a hack) go in and get it by the subviews array: for (id subview in webView.subviews){ if ([[subview class] isSubclassOfClass: [UIScrollView class]]) { UIScrollView * s =
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