How to use SafeAreaInsets in SwiftUI | Bootcamp #65
Summary
TLDR在这段视频中,Nick 介绍了在 Swift UI 中使用安全区域边距(safe area insets)的新方法。尽管这不是一个全新的概念,因为之前已经讨论过如何忽略或不忽略安全区域,但这个视频展示了如何在安全区域内有意识地放置视图、文本或按钮。Nick 通过创建一个名为 'safe area inset boot camp' 的新 Swift UI 文件,展示了如何利用安全区域边距来定位 UI 元素。他通过几个示例说明了如何在屏幕底部放置元素,包括使用对齐和间距属性来调整元素的位置。此外,Nick 还探讨了如何将元素放置在屏幕顶部,并且提到了如何创建一个固定在顶部的标题栏。虽然这个功能并不是非常常见,但视频提供了一个有用的工具,供开发者在需要时使用。
Takeaways
- 📘 Swiftful Thinking 视频中,Nick 介绍了如何使用 iOS 16 中的新特性:安全区域边距(safe area insets)
- 📌 安全区域边距不是替代之前关于安全区域的讨论,而是提供了一种新的方式来处理 UI 元素与安全区域的关系
- 🔍 即使不常用,了解安全区域边距对于开发者来说也是一个有用的工具,可以在需要时使用
- 📱 通过安全区域边距,开发者可以更容易地将视图、文本或按钮放置在屏幕的安全区域内
- 🤔 Nick 认为使用安全区域边距有些棘手,并且不是特别喜欢这种方式,但仍然展示了如何使用
- 🔄 通过几个快速示例,Nick 展示了如何利用安全区域边距在屏幕底部添加内容
- 📊 可以利用安全区域边距将元素放置在屏幕的底部或顶部,这在不同的设备上可以更加动态
- 📐 除了底部,还可以使用顶部安全区域边距,这在有导航标题的情况下看起来会稍有不同
- 🔄 利用安全区域边距可以实现类似悬停按钮的效果,或者创建一个随着用户滚动而悬停的标题
- 📊 可以创建一个固定在屏幕顶部的标题栏,即使在用户滚动时也能保持在顶部
- 🛠️ 安全区域边距是 Swift UI 开发者的一个便利修饰符,它简化了之前需要手动管理安全区域的复杂性
- ✅ 虽然不是所有应用都需要使用安全区域边距,但了解这个特性对于开发者来说是一个不错的选择
Q & A
Swiftful Thinking 的视频主要介绍了什么内容?
-视频主要介绍了在Swift UI中如何使用安全区域边距(safe area insets)来放置视图、文本或按钮等UI元素。
为什么说使用安全区域边距不是替代之前处理安全区域的方法?
-因为安全区域边距是用于在安全区域内故意放置UI元素的一种新方式,而不是用来取代之前处理安全区域的方法,两者需要结合使用。
在Swift UI中,如何使用安全区域边距来放置UI元素?
-可以通过使用`safeAreaInset`修饰符,并指定边距的边缘(如`bottom`或`top`),然后添加对齐方式和内容来实现。
视频提到了在iOS 16中有哪些关于安全区域边距的新特性?
-视频提到了在iOS 16中,可以使用安全区域边距来放置UI元素,并且可以动态地适应不同设备的底部或顶部安全区域。
为什么说使用安全区域边距放置UI元素比使用覆盖层(overlay)更简单?
-使用覆盖层需要手动管理安全区域,而使用安全区域边距可以直接将元素放置在顶部或底部,不需要额外处理安全区域的逻辑。
在Swift UI中,如何创建一个新的Swift UI视图文件?
-可以通过在Navigator中右键点击并选择创建新文件,然后选择Swift UI View,并为文件命名。
视频提到了哪些使用安全区域边距的可能场景?
-视频提到了将文本或按钮放置在屏幕底部、创建悬浮按钮、固定标题栏等使用场景。
为什么视频作者认为使用安全区域边距放置UI元素的方式有些棘手?
-因为作者认为这种方式虽然提供了一种新的放置UI元素的方法,但在实际操作中可能不如预期的那样直观或容易,需要更多的尝试和调整。
视频作者对于在屏幕底部放置UI元素有哪些建议?
-作者建议可以使用安全区域边距来放置UI元素,并且可以设置不同的对齐方式,如居中、靠左或靠右,以及可以设置形状剪裁等。
在Swift UI中,如何实现一个固定在屏幕顶部的标题栏?
-可以使用`safeAreaInset`修饰符的`top`边缘,并结合`pinned()`修饰符来实现一个固定在屏幕顶部的标题栏。
视频作者对于使用安全区域边距的总体态度是怎样的?
-作者认为使用安全区域边距不是一个非常常见的做法,但他还是想展示给观众,以便他们在需要时可以使用这个工具。
Outlines
😀介绍安全区域插入
这段视频介绍了在Swift UI中使用安全区域插入的新修饰符。作者指出,虽然以前我们已经学习了如何管理安全区域以及如何忽略或不忽略安全区域,但这个新修饰符并不取代之前的方法,而是为了更灵活地在视图中放置特定的UI元素到安全区域内。虽然作者表示在应用程序中并不常用这个功能,但还是想让大家了解并掌握。作者创建了一个名为'safe area inset boot camp'的Swift UI视图,演示了如何使用这个新修饰符。通过示例演示了如何将UI元素放置在底部安全区域,并展示了一些可能的应用场景,如悬停按钮、固定标题等。最后,作者指出,虽然这个功能并不是以前做不到的事情,但它为Swift UI开发者提供了一种更方便的方式来管理安全区域内的UI元素。
😀使用安全区域插入的示例
这段视频展示了如何使用安全区域插入来在Swift UI中创建一些特定的UI布局。作者通过几个示例演示了如何在底部和顶部安全区域内放置UI元素,如悬停按钮、固定标题等。作者强调,虽然以前可以使用覆盖视图等方式实现类似效果,但使用安全区域插入更加方便,因为它不需要手动管理安全区域,而是直接将UI元素放置在指定的安全区域内。通过这些示例,观众可以了解到如何灵活地利用安全区域插入来创建不同的UI布局,增强应用程序的用户体验。
Mindmap
Keywords
💡Swiftful Thinking
💡安全区域边距(safe area insets)
💡Swift UI
💡iOS 16
💡导航栈(navigation stack)
💡矩形(rectangles)
💡导航标题(nav title)
💡覆盖层(overlay)
💡对齐(alignment)
💡间距(spacing)
💡内容(content)
Highlights
Nick介绍了如何在Swift UI中使用安全区域边距(safe area insets)来放置视图、文本或按钮。
安全区域边距是iOS 16中的一个新特性,允许开发者在屏幕的安全区域内放置UI元素。
即使在之前已经讨论过安全区域,安全区域边距并不是替代品,而是提供另一种处理方式。
通过使用安全区域边距,可以更简单地将元素放置在屏幕底部等安全区域内。
Nick展示了如何创建一个新的Swift UI视图文件,并命名为'safe area inset boot camp'。
安全区域边距可以用于动态地适应不同设备的安全区域。
通过使用safe area inset,可以避免手动管理安全区域的复杂性。
Nick通过示例演示了如何在屏幕底部添加一个黄色背景的文本,并使其位于安全区域内。
除了底部,safe area insets还可以用来放置顶部的元素,如导航标题下方。
safe area insets提供了一种新的方式来创建悬浮按钮或固定标题,而无需复杂的布局代码。
Nick展示了如何将一个黄色条固定在屏幕顶部,即使在滚动时也能保持可见。
safe area insets提供了一种简便的方法来处理UI元素与屏幕边缘的关系,而无需手动计算。
Nick提到,尽管safe area insets非常有用,但在实际应用中并不常见。
通过safe area insets,开发者可以更容易地实现在屏幕边缘的UI设计,如悬浮按钮或固定标题。
Nick强调了safe area insets作为Swift UI开发者工具箱中的另一个便利修饰符的价值。
即使开发者可能不会经常使用safe area insets,了解其功能和用法对于处理特定UI布局非常有用。
Nick在视频结束时感谢观众,并预告了下一个视频的内容。
Transcripts
all right welcome back everybody my name
is Nick this is swiftful thinking and
this is gonna be a quick video on the
safe area insets
so previously I've covered the safe area
and how we can ignore or not ignore the
safe area this is kind of along the same
lines but it is not replacing that we
still need to do that in our code this
is more for if we have a view or a text
or a button that we purposely want to
put in the safe area we can use this new
modifier I don't think this is super
common I haven't really used it much in
apps but I wanted to show to you guys
get it in your toolbox so at least you
know it's there in case you want to use
it
[Music]
all right a relatively quick video here
just something I want to show you guys I
don't use it that often but it is kind
of cool nice little update in iOS 16.
let's right click the Navigator create a
new file this will be a swift UI View
and I'm going to call this safe area
inset boot camp
click create now if you did follow this
bootcamp of course you know that I did a
whole entire video on how to use the
safe area in Swift UI that is still
applicable this is not replacing that we
still need to manage the safe area in
that same exact way this however allows
us to put a little bit of code some UI
inside that safe area if we want to
so it's a little tricky to work with and
I'm honestly not a fan of how tricky it
is but let's take a look at a couple
quick examples here so I'm going to do a
navigation stack open the brackets let's
put in a maybe a list here and I'm just
going to go from zero to less than 10.
and let's just put some rectangles on
the screen let's give it a height of
maybe
I don't know what's a good height guys
300 sure
and there we go all right so you have
this nice basic UI that we can scroll
let's also add in a nav Title Here of
maybe let's call a safe area insets
and the the problem in question is
basically like how do we put something
in the safe area at the bottom here
now there are existing ways to do this
right I could do like an overlay
and maybe I put in like a text here that
says hi
let's give it a background
color. yellow
and maybe I align that overlay
to the bottom
right so now I am at the bottom let's do
a Max frame
premium Max width Infinity I do have it
in the safe area and it's over the
bottom so that actually does work right
so this is not really solving a problem
that was unsolvable before but a new
easy way to do this is to call the safe
area inset
and we can give it an edge the edge of
course is going to be the bottom
the alignment let's just keep it as
Center for a second
spacing doesn't matter because we're
going to put one item for now and
content so I'm going to take this High
I'm just going to put it in here
uncommented out
and now we have the exact same UI I
guess this is maybe going to be a little
more Dynamic on different devices but
that is just the newer way to do it
basically
I I have not used this very often in
apps because it's not super common but
let's just play around with it a little
bit before we end this video
so maybe I get rid of the max frame here
we can see that it's aligned to the
center I could also align it to maybe
the Leading Edge so now it's over here
so this could be like if you want to do
like a hovering button here maybe you do
like some padding
and and maybe there's some padding
before as well just so it's a little bit
bigger and maybe you clip shape it into
a circle
now you have like a hover button on the
bottom left corner we could also do
trailing so it's in the bottom right
corner
one thing that is unique to the safe
area insets is that we can do the top
so the Top's gonna look a little
different with the navigation title here
so it's actually like right below the
navigation title
so this could be cool if you wanted to
do some sort of like hover as the user
Scrolls
I think at the top maybe a little more
common use case would be like a pinned
header so if you use the lazy V Stacks
you have the option to pin the headers
but it's kind of like automatically pins
so we could do something like this where
we maybe
let's see add in just like a yellow bar
at the top so when the user Scrolls now
we have that high just pinning to the
top right something that's maybe a
little bit unique
we can call it maybe not edgesignoring
safe area dot bottom so it's not
ignoring the top
and then you know we have just this nice
pinned header here
it looks a little funky when this
Scrolls down I'm not a huge fan of that
UI but now you know at least that you
can do this maybe you put some filters
here maybe it's just a some sort of
hovering title that's next to the safe
area of course if I change the nav title
here maybe I wanted to do like a nav bar
display in line now I have that like pin
header just like always at the top which
is kind of cool
yeah so again that's basically all we're
covering in this video this is not
anything that couldn't be done without
the safe area insets like you could draw
overlays you could draw backgrounds but
when you're doing those overlays you
have to kind of manage the safe area
yourself you have to understand whether
or not you're in the safe area or not
whether you're ignoring it or not and
here we can just
throw it into the top or the bottom and
call it a day which is yet another
convenience modifier for Swift UI
Developers
all right maybe you're not going to use
this but at least now you know how to
use it so thank you guys for watching as
always I'm Nick this is swifflethinking
and I'll see you in the next video
[Music]
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