uiscrollview

Drawing an infinite grid in iOS

由 老子叫甜甜 提交于 2020-05-28 06:19:10
问题 I would like to know the best way to create an infinite grid on an iOS app I'm building. I use internal hardware on an iPhone to gather real-world data and build vectors. I'd like to visually represent the vector data on this grid that sort of acts like a graph. Each vector is represented as a line, and each new vector is attached to the previous vector on this grid. I'm building the app so that it can run for however long the user wants (from minutes - hours). The only problem I'm having

How to align stack view vertically in center inside scroll view?

由 徘徊边缘 提交于 2020-05-17 06:07:44
问题 I've a stack view inside scroll view as shown in the image below. I want to align it vertically in center. It doesn't align vertically in center on iPhone 5S, it works fine on iPhone 11 Pro Max. I've seen this solution https://stackoverflow.com/a/50767533/12114641 and my implementation is exactly same. How do I fix it so that i aligns vertically in center on all devices? 来源： https://stackoverflow.com/questions/61829858/how-to-align-stack-view-vertically-in-center-inside-scroll-view

How to align stack view vertically in center inside scroll view?

由 微笑、不失礼 提交于 2020-05-17 06:07:34
问题 I've a stack view inside scroll view as shown in the image below. I want to align it vertically in center. It doesn't align vertically in center on iPhone 5S, it works fine on iPhone 11 Pro Max. I've seen this solution https://stackoverflow.com/a/50767533/12114641 and my implementation is exactly same. How do I fix it so that i aligns vertically in center on all devices? 来源： https://stackoverflow.com/questions/61829858/how-to-align-stack-view-vertically-in-center-inside-scroll-view

UIScrollView ContentView dynamic height constraints

由 岁酱吖の 提交于 2020-05-13 01:21:49
问题 I am facing issue with contentView height constraints. All labels have dynamic height i.e no fixed height. I have read somewhere to set height equal to scrollview height. The height of ViewController is currently 870px, scrollview height is 757px. I have no idea how can i set height in AutoLayout , as I am unable to scroll after a certain point. I have set UIScrollView first then I added UIView as the child of the UIScrollView then I added 2 UIImageView and few UILabels, the size of UILabel

UIScrollView ContentView dynamic height constraints

由 蓝咒 提交于 2020-05-13 01:20:06
问题 I am facing issue with contentView height constraints. All labels have dynamic height i.e no fixed height. I have read somewhere to set height equal to scrollview height. The height of ViewController is currently 870px, scrollview height is 757px. I have no idea how can i set height in AutoLayout , as I am unable to scroll after a certain point. I have set UIScrollView first then I added UIView as the child of the UIScrollView then I added 2 UIImageView and few UILabels, the size of UILabel

React Native ScrollView is not scrolling to the bottom sometimes

由 馋奶兔 提交于 2020-05-10 07:26:41
问题 inside my application index.io.js there is only 1 ScrollView that is wrapped inside a View under the render function. Sometimes I can scroll to the very bottom of the ScrollView and keep the screen there. However the ScrollView would bounce back to the top of the screen and fail to stay at the bottom sometimes. Does anyone know what is happening? Thanks. render() { return <View style={{flex: 1}}> <ScrollView> <Text>234</Text> <Text>234</Text> <Text>234</Text> <Text>234</Text> // .... repeat

React Native ScrollView is not scrolling to the bottom sometimes

由 随声附和 提交于 2020-05-10 07:26:20
问题 inside my application index.io.js there is only 1 ScrollView that is wrapped inside a View under the render function. Sometimes I can scroll to the very bottom of the ScrollView and keep the screen there. However the ScrollView would bounce back to the top of the screen and fail to stay at the bottom sometimes. Does anyone know what is happening? Thanks. render() { return <View style={{flex: 1}}> <ScrollView> <Text>234</Text> <Text>234</Text> <Text>234</Text> <Text>234</Text> // .... repeat

Center UIView vertically in scroll view when its dynamic Labels are small enough, but align it to the top once they are not

由 谁都会走 提交于 2020-05-09 18:53:10
问题 I have a view with 3 dynamic labels inside it and I am trying to find a way to centre it vertically in a scroll view but when its dynamic labels are too large to fit on a page, make the text start from the top. What Xcode is doing at the moment is this: What I am trying to do is this: Any ideas about how to achieve this? Thanks. 回答1: You can accomplish this by embedding the labels in a stack view and embedding the stack view in a UIView. The label text will expand the stack view vertically,

performSelector:withObject:afterDelay: not working from scrollViewDidZoom

由 不羁的心 提交于 2020-04-29 08:20:34
问题 I feel like I should know this but I've been stumped for hours now and I've run out of ideas. The theory is simple, the user manipulates the zoom and positioning in a scrollview using a pinch. If they hold that pinch for a short period of time then the scrollview records the zoom level and content offsets. So I thought I'd start a performSelector:withObject:withDelay on the scrollViewDidZoom delegate method. If it expires then I record the settings. I delete the scheduled call every time

Chisel-LLDB命令插件，让调试更Easy

由 天涯浪子 提交于 2020-03-26 08:13:37
http://blog.cnbluebox.com/blog/2015/03/05/chisel/ LLDB 是一个有着 REPL 的特性和 C++ ,Python 插件的开源调试器。LLDB 绑定在 Xcode 内部，存在于主窗口底部的控制台中。调试器允许你在程序运行的特定时暂停它，你可以查看变量的值，执行自定的指令，并且按照你所认为合适的步骤来操作程序的进展。( 这里 有一个关于调试器如何工作的总体的解释。) 相信每个人或多或少都在用LLDB来调试，比如 po 一个对象。LLDB的是非常强大的，且有内建的，完整的 Python 支持。今天我们主要介绍一个 facebook 开源的 lldb 插件 Chisel。可以让你的调试更Easy. 1.安装Chisel 源码地址： Chisel Chisel 使用 homebrew 来安装，如果你没有安装homebrew, 参考 homebrew 。 1 2 brew update brew install chisel 安装完成按照安装日志上的提示，在 ~/.lldbinit 文件中添加一行，没有则新建。 提示类似如下： 1 2 3 ==> Caveats Add the following line to ~/.lldbinit to load chisel when Xcode launches: command script
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