text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
that all environments
will actually have these. | 517.94 | 2.03 |
And so fetch is something that's
not supported by all browsers, | 519.97 | 4.199 |
but by polyfilling it
you can actually include | 524.169 | 2.891 |
code that will implement fetch
if it doesn't exist already. | 527.06 | 2.88 |
And so things like fetch timers like
set interval or console or console.log, | 529.94 | 6.24 |
console.warn, and stuff like
that have been polyfilled so | 536.18 | 3.995 |
that they work in React Native as well. | 540.175 | 4.144 |
And also the way that
you handle navigation | 544.319 | 1.791 |
is slightly different in
React Native, and we'll | 546.11 | 1.999 |
talk about that in a future lecture. | 548.109 | 1.993 |
And so I said that React Native base
components are slightly different. | 550.102 | 2.958 |
And so what do I mean there? | 553.06 | 2.81 |
So in React Web we had access to
things like div or span or P image, | 555.87 | 4.82 |
and we can just declare those globally. | 560.69 | 2.84 |
But in React Native we actually have to
import from the React Native library, | 563.53 | 4.6 |
and we'll see how to do
that in a little bit. | 568.13 | 2.64 |
And so divs no longer exist and
what we use instead are Views. | 570.77 | 2.84 |
So View with a capital V is basically
a cross-platform, just blank E-Y slate. | 573.61 | 7.58 |
So basically the same thing as a div. | 581.19 | 3.17 |
There's no such thing
as span or P anymore | 584.36 | 2.31 |
and so instead we use this text. | 586.67 | 1.887 |
And so what's unique in React
Native is that all text actually | 588.557 | 2.583 |
must be wrapped by this text tag. | 591.14 | 3.69 |
As you saw in this previous
example lower case button | 594.83 | 2.52 |
doesn't exist anymore. | 597.35 | 1.45 |
Instead, we use capitol Button
with a slightly different API. | 598.8 | 2.81 |
And so from React Web, if you
want to attach a handler to that | 601.61 | 3.66 |
you do on click. | 605.27 | 1.2 |
Whereas, in React Native, you
do on press which was actually | 606.47 | 3.78 |
the bug in the code earlier. | 610.25 | 2.85 |
And lastly we have these things
called scroll views or lists which | 613.1 | 3.87 |
don't really exist in web world, but
they do exist a lot in React Native, | 616.97 | 5.82 |
and we'll be talking about
those in the future as well. | 622.79 | 2.852 |
Of course there are many,
many other components | 625.642 | 1.958 |
and, if you want to explore them,
the documentation is really good. | 627.6 | 3.84 |
Cool, so let's actually
take that example | 634.52 | 2.04 |
that we wrote last lecture,
the to do app, and actually | 636.56 | 3.36 |
translate it into React Native. | 639.92 | 2.12 |
And so I have here this implementation,
which is exactly the code | 642.04 | 6.82 |
that we wrote in the previous lecture. | 648.86 | 1.624 |
And what we're going to do is
copy and paste that into the Snack | 650.484 | 2.666 |
that we saw earlier and go ahead and
translate that into React Native. | 653.15 | 3.18 |
So this is just the command
to copy it and let's actually | 661.67 | 4.74 |
paste that into here. | 666.41 | 3.15 |
So of course there's going to be many
errors just because this is React Web | 669.56 | 3.27 |
and we're trying to run
this in React Native. | 672.83 | 2.22 |
And so let's go ahead and
try to fix those errors. | 675.05 | 3.27 |
And so first we see stuff like
LI, input, button, and those | 678.32 | 4.71 |
don't exist in React Native. | 683.03 | 1.32 |
And so we'll have to first
replace those React Web | 684.35 | 3.45 |
components with React Native ones. | 687.8 | 3.85 |
And so this rendering
does not exist anymore. | 691.65 | 2.255 |
And so let's first do import
some stuff from React Native. | 693.905 | 6.375 |
And we'll be talking about imports
and exports a little bit later, | 700.28 | 3.82 |
but just bear with me for now. | 704.1 | 1.73 |
And so some things that we're
going to need are stuff like View, | 705.83 | 3.16 |
we'll need a Button and we'll need text. | 708.99 | 2.72 |
And we'll need some scrolling
views and then maybe | 715.88 | 4.71 |
some more stuff in a little bit. | 720.59 | 2.07 |
So first let's work on
that quick to do component. | 722.66 | 3.36 |
And so we have a list item here,
instead let's actually use a View. | 726.02 | 3.15 |
Let's actually get rid of this input for
now, and we'll add that in a little bit | 734.2 | 4.35 |
later. | 738.55 | 1.05 |
But how are we going to change this
lowercase button to React Native? | 739.6 | 4.336 |
Well first we need to replace it
with the capital Button, which | 743.936 | 2.624 |
is React Natives version of the button. | 746.56 | 2.174 |
It no longer has an on click
property and so instead we'll | 748.734 | 2.416 |
pass an on press prop and then we don't
actually wrap the content any more | 751.15 | 6.69 |
instead we pass a title prop. | 757.84 | 2.48 |
And so that button's done. | 763.026 | 1.874 |
What are we going to do for span? | 764.9 | 1.73 |
Anyone? | 766.63 | 1.536 |
AUDIENCE: [INAUDIBLE] | 768.166 | 0.874 |
SPEAKER 1: Yeah, we'll
use a text instead. | 769.04 | 1.749 |
And now our to do is done. | 773.41 | 2.73 |
So now let's start looking
into this app component. | 776.14 | 3.201 |
So first let's get rid of this render,
which does not exist in React Native, | 782.17 | 5.94 |
and let's start working our way
through this big return function here. | 788.11 | 3.48 |
So first we have a div. | 791.59 | 1.23 |
Instead of a div let's
go ahead and use a View. | 792.82 | 2.25 |
And then we have a to do count. | 798.639 | 1.291 |
So what are we going to
use instead of this div? | 799.93 | 3.27 |
We can't use a View
otherwise an error will | 803.2 | 1.86 |
be thrown because remember the
only way that we can include text | 805.06 | 3.63 |
in React Native is by wrapping it in
this text component and same thing | 808.69 | 5.921 |
with this. | 814.611 | 0.499 |
All right, we see another button
and we've seen a button before, | 817.924 | 2.666 |
so all we have to do is replace
that lowercase b with a capital B, | 820.59 | 3.5 |
change on click to on press and
change the content to be title. | 824.09 | 4.495 |
And then we're done there. | 835.007 | 1.083 |
All right, UL, unordered lists. | 841.39 | 2.29 |
So how might we handle this
unordered list in React Native? | 843.68 | 5.35 |
So lists, ULs and ordered
lists don't actually | 849.03 | 4.15 |
exist in React Native, and the
way that we handled those instead | 853.18 | 2.89 |
are by using the scrolling
components because we don't know | 856.07 | 6.815 |
how long that list is going
to get and so we better | 862.885 | 2.125 |
assume it's going to get pretty long
and be able to scroll through them | 865.01 | 2.07 |
if we needed. | 867.08 | 1.31 |
And so unordered lists we
replace with scroll view | 868.39 | 4.18 |
and now we have what
we were looking for. | 872.57 | 3.01 |
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