uiscrollview

XCode: Programmatically enable a symbolic breakpoint?

由 烂漫一生 提交于 2020-01-03 17:05:54
问题 Is there a way to programmatically enable a breakpoint? Normally I'd use a breakpoint condition, but I need to use a symbolic breakpoint. Specifically, something is changing the contentOffset of my UIScrollView between a call to scrollToIndexPath and a call to reloadData . I'd like to enable the symbolic breakpoint only after the call to scrollToIndexPath . 回答1: Jim Ingham's answer works on a x86 system. For an iOS device I was able to use the method described in this answer to

UIScrollView scroll by offset

由 我们两清 提交于 2020-01-03 16:46:54
问题 I've this situation: one scrollView that fit all screen N "cells" inside scrollView, each of them contains a label each cell is 80px on height fixed green mask (UIView) I programmatically create the cells (UIView) with label inside and correctly set contentSize of scrollView. I know that scrollView.setContentOffset(CGPoint(x: 0, y: 80.0), animated: true) move scroll view by 80. How can I "override" scroll view behaviour in order to always scroll by 80? What i want is sort of picker behaviour.

UIScrollView实现图片轮播器的无限滚动

由 微笑、不失礼 提交于 2020-01-03 12:17:10
简介 在现在的一些App中常常见到图片轮播器，一般用于展示广告、新闻等数据，在iOS内并没有现成的控件直接实现这种功能，但是通过UIScrollView的允许分页设置，可以实现滚动轮播的功能。 轮播原理 UIScrollView对象有pagingEnable成员，如果设置为YES，那么每一个scrollView尺寸这么大的区域就会被当作一页，在滚动时会根据滚动的比例自动计算应该切换到哪一页。 无限滚动原理 要实现无限滚动，需要额外的两张图片，假设我们的图片有五张，存在images数组中，那么我们在将图片插入到scrollView中时，在第一张图片前面插入一个最后一张图片作为辅助图片，在最后一张后面插入一个第一张图片作为辅助图片。这样，当滚动到第一张前面一张时，在页面切换结束后无动画的切换scrollView的偏移量为最后一张图片（不包含最后一张后面的第一张那个辅助图片），这样就实现了由辅助图片到真实图片的过渡，之所以设置辅助图片是为了在滚动中看到那个真实图片。同理，当滚动到最后一张的后面一张时，我们吧scrollView的偏移量设置为第一张图片即可。 具体的代码实现 这个代码是在开发一个项目中所写的，已经封装称一个View，只需要调用initWithFrame指定轮播器尺寸，然后通过设置images成员的值即可实现无限滚动的轮播。 // .h // // ESPicPageView

Add selector to button on UIScrollView views added dynamically

由 生来就可爱ヽ(ⅴ＜●) 提交于 2020-01-03 06:39:12
问题 I have an UIScrollView with n views added dynamically from metadata stored by archiving. I have a PressGesture to make wobble animation (like iOS deleting apps way) and i want to add a button to every subview on the ScrollView for deleting it from the ScrollView and from files. My problem is for adding the target to the buttons. When they are pressed, the selector (on the UIViewController parent of the UIScrollView) are not called. How can I get this done? Any other approach is suggested?

iOS using UITapGestureRecognizer with UILabel to swipe to the next page

由 柔情痞子 提交于 2020-01-03 05:10:09
问题 Sorry if I overlooked a potential answer to my question, but I'm having trouble with using the UITapGestureRecognizer with a UILabel inside a subview UIViewController class... Basically, I've created a custom UIViewController that has a UILabel and a few other irrelevant elements. This custom UIViewController, however, is inside a custom UIScrollView with paging enabled and the labels are offset just enough so you can see the next UIViewController's label. What I want to do is when the user

Deciding height for UIScrollView with UIWebView inside

由 随声附和 提交于 2020-01-03 03:44:06
问题 I have a detail view where I want to show a title, subtitle and content for articles. I want to be able to use HTML to format the text, so I've used a UIWebView for showing the article body. This works perfectly. How ever, all of this, is inside a UIScrollView, so my issue is that I have to calculate the height of the UIScrollView? This is how it works today: And this is how it looks like in Storyboard: So what I need to find out, is what is the correct code and syntax to calculate the

iOS - load and switch between pages using UIPageContol

由 一世执手 提交于 2020-01-03 03:26:22
问题 I would like to use UIPageControl to navigate between different view controllers. I have 2 view controllers and another main view controller contains the UIPageControl . The 2 view controllers to be navigated between have been added as children to the main view controller. When I currently start the application, I see a blank screen. I used pageControl.currentPage = 0 but I am unable to understand why I am unable to see the views. Note that I do not want to use UIScrollView in my application.

how can i get selectedRange.location value?

由 邮差的信 提交于 2020-01-02 20:10:48
问题 i want to get a cursor position from UITextview, i have implement the code in How to find a pixel-positon of a cursor in UITextView? post, the algorithm is based on algorithm in Pixel-Position of Cursor in UITextView. my problem is, i can't get the selectedRange.location value after keyboard appear in the 2nd time, cause it always tell that the value of location is 2147483647, which means not found. This is my implementation : -(void)getCursorPosition{ NSRange originalPosition = self

how can i get selectedRange.location value?

由 本小妞迷上赌 提交于 2020-01-02 20:10:02
问题 i want to get a cursor position from UITextview, i have implement the code in How to find a pixel-positon of a cursor in UITextView? post, the algorithm is based on algorithm in Pixel-Position of Cursor in UITextView. my problem is, i can't get the selectedRange.location value after keyboard appear in the 2nd time, cause it always tell that the value of location is 2147483647, which means not found. This is my implementation : -(void)getCursorPosition{ NSRange originalPosition = self

ScrollView Not Scrolling to The End of The View

由 人走茶凉 提交于 2020-01-02 13:51:57
问题 In my ViewController i added a ScrollView and a view inside the ScrollView using StoryBoard (set constraints on ScrollView and the View). now in my code i am using the View to add other views dynamically. the views are being added but my question is related to scrolling. i am able to scroll but it is not scrolling to the last view... i tried doing the following override func viewDidLayoutSubviews() { ScrollView.contentSize.height = contentView.frame.height } but this did not work, also i
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