I'm making a game in React Native. Part of the game includes a grid of buttons in a dimond shape similar to this:
To make it more complex, the assets are in SVG format. Although I am able to make a button using an SVG, what I'm a bit stumped on is laying out the buttons in this dimond shape, with an SVG layer behind it, and keeping that shape, with the buttons overlayed intact with different screen sizes.
Does anyone have experiece with this?
You can try with transform like
<TouchableOpacity
style={{
height: 30,
width: 30,
marginVertical: 10,
borderColor: 'black',
borderWidth: 2,
transform: [{ rotate: '45deg' }],
}}
/>
Related
I'm trying to create a simple Floating Action Bar button with a plus icon in it, and have had trouble true-centering the "plus" in some edge cases. I was just using '\uFF0B' in a <Text>, but tried to switch to react-native-vector-icons, only to discover that they too were using a font and not an image to back the <Icon> instances, and that my problems seem to persist.
Things are fine on most screens and devices but in some cases users are reporting the plus icon is not perfectly centered. I have a hypothesis that it may involve users' accessibility options increasing the font size in the app beyond size of the parent View. At any rate I can reproduce something like the screenshots folks are sharing with me by setting the fontSize greater than the lineHeight. Assuming that is the issue -
How do you center a single glyph within the view area of a <Text> (or <Icon>, since that derives from <Text>), even when the fontSize may be much larger than the <Text>'s lineHeight or even overall height?
In the below example, the "+" font size is exactly double the line-height, so the plus is centered smack dab on the upper-right corner of the view area, as though it were expecting to be in a box that was 112dp x 112dp; but I want it centered dead-center of the 56dp x 56dp box instead, with the arms of the plus cropped. No combination of style attributes seems to effect it, but rather just controls where the <Icon> positions within its parent.
Currently:
Normally:
For oversized font:
Code:
<View style={s.fabStyle}>
<TouchableOpacity onPress={()=>{this.onPlus()}}>
<Icon name="plus" style={s.fabText} />
</TouchableOpacity>
</View>
...
const s = StyleSheet.create({
fabStyle: {
position: 'absolute',
right: 16,
bottom: 16,
borderRadius: 28,
width: 56,
height: 56,
backgroundColor: styleConstants.color.primary,
display: 'flex',
justifyContent: 'center',
alignItems: 'center',
textAlign: 'center',
},
fabText: {
position: 'relative',
left: 0,
top: 0,
right: 0,
bottom: 0,
fontSize: 112,
color: '#fff',
textAlign: 'center',
lineHeight: 56,
width: 56,
height: 56,
},
});
This isn't an answer to the question itself, which still stands, but an answer to the underlying issue, in case somebody arrives here by Google search with a similar issue. In my case it was indeed the case that accessibility settings were causing font to be bigger than it was designed to be, thus triggering the above scenario. While I still don't know how to center the text adequately in this case, in my case the issue could be circumvented by making sure allowFontScaling=false for relevant Views holding text.
I have a circle button (made with borderRadius) in React Native. The text in the component should be centered both vertically and horizonatlly.
Horyzontally it's fine, but the vertical alignment seems to fail whatever I do. Even if it looks good on large cicles with small fontSize, the small circles proof it wrong!
<View style = {{
alignItems:'center',
justifyContent:'center',
backgroundColor:'yellow',
borderColor: this.props.color,
width:size, height:size,
borderRadius:size,
borderWidth:borderWidth,
}}>
<Text style = {{
textAlign: 'center',
backgroundColor:'none',
fontSize:fontSize,
lineHeight:fontSize,
}}>
{this.props.title}
</Text>
</View>
Although already answered elsewhere, I'm unable to center text (in this case) in a circle properly.
As one can see on the image with the green background of the <Text>-Component, the text is just not centered perfectly. Even though the itself is perfecttly aligned...
Here is a snack for Expo with the whole code reduced to the necessary and with different example sizes: https://repl.it/#PaulHuchner/Centered-Text-in-Circles
I have tried the previous answer with only Text and calculating line-height. which looks like a little overkill and didn't work for me. So here's my answer.
I am using View as the container with justifyContent:center
<View style={{
width: 40,
height: 40,
borderRadius: 20,
borderWidth: 1,
borderColor: 'black',
borderStyle: 'solid',
justifyContent: 'center'}}>
<Text style={{fontSize: 20,textAlign: 'center'}}>20</Text></View>
You're trying to set the same fontSize and lineHeight as the circle's diameter, which has borderWidth of 10 included to it.
Due to the borderWidth, the text is being cut and overlayed over the circle. The lineHeight assigned to the cut Text is more than required, hence it is displayed misaligned.
Therefore you need to reduce the fontSize and the lineHeight based on the borderRadius of the circle, to function properly for all dimensions.
<Text style = {{
textAlign: 'center',
backgroundColor:'green',
fontSize:fontSize - 2 * borderWidth, //... One for top and one for bottom alignment
lineHeight:fontSize - (Platform.OS === 'ios' ? 2 * borderWidth : borderWidth), //... One for top and one for bottom alignment
}}>
Here's a snack link
The solution that worked the best for me was instead of using a Text Element, instead, use a plus Icon. The difference is that the viewBox of "+" as a character isn't centered.
If that is confusing look at these three letters
A+a
Notice that "A" is taller than "+" and also "a". So instead, use a PLUS icon instead and it will be perfectly centered such as 24x24 px. This drove me mad!
I need to add a shadow around the Image my image is a rectangular field and i need to add a shadow around that rectangular field
I want to do something like this: stackoverflow question
I wanted to know how to do this in react native that can be applicable for both android and ios
Shadow is only for iOS. For Android you need Elevation. You could do something like this. I use it currently and works fine:
elevationLow: {
...Platform.select({
ios: {
shadowColor: '#000',
shadowOffset: { width: 0, height: 2 },
shadowOpacity: 0.8,
shadowRadius: 2,
},
android: {
elevation: 5,
},
}),
},
Wrap your Image inside View (for semantic clarity) and then define following style rules to the View:
shadow: {
shadowColor: '#202020',
shadowOffset: {width: 0, height: 0},
shadowRadius: 5,
},
I made an example here: https://snack.expo.io/rJesdOgRZ. But atm "snack" is so freaking slow that it's difficult to check actual results. But at least the code is visible and works as a benchmark.
You can use shadow style props for your View to achieve this. You will want
shadowOffset = takes in height and (optional, i dont really like using it, but ) width values to move your shadow in those directions.
shadowColor = takes a colour, similar to backgroundColor, indicates colour of the shadow
shadowRadius = takes a value, will dictate how far out your shadow is from the View
shadowOpacity = value from 0 to 1, indicates how strong the shadow presence is.
Heres a quick example of something you probably want. This code will make a red circle, with a slight shadow visible at the bottom of the circle. This code is of course customizable.
<View style = {{
position: 'absolute', top: 50, left: 50,
backgroundColor: 'red', width: 100, height: 100, borderRadius: 50,
shadowColor: "black",
shadowOffset: { height: 2},
shadowOpacity: 0.3,
}}>
//CONTENT
</View>
Another easiest and the best option I came across is the use of react-native-shadow-2 along with react-native-svg. Here, we need to install react-native-svg since react-native-shadow-2 is dependant on react-native-svg.
Basic shadow
import { Shadow } from 'react-native-shadow-2';
export default const ImageWithShadow = () => {
<Shadow>
<Image style={styles.imageStyles} source={ImageSource} />
</Shadow>
}
Advance shadow styling
import { Shadow } from 'react-native-shadow-2';
export default const ImageWithShadow = () => {
<Shadow startColor='#00000020' distance=10 radius=5 size=20>
<Image style={styles.imageStyles} source={ImageSource} />
</Shadow>
}
As shown in the above sample code you have to just wrap all the content (image or text or View or any other react native component) that you need to add a shadow inside the tag. No need of doing any manual styling like in react native shadow options. If you browse their documentation you can find many props that you can effectively utilize to customize the shadow applied to the component.
I have recently been experimenting with react-native for UWP and I want to ask if there is any shadow support for UWP yet.
Right now, I have this code for the container
const styles = {
viewStyle: {
backgroundColor: '#F8F8F8',
height: 60,
paddingTop: 12,
justifyContent: 'center',
alignItems: 'center',
shadowColor: '#000',
shadowOffset: { width: 0, height: 2 },
shadowOpacity: 0.2,
elevation: 4,
position: 'relative'
}
};
but no shadow appears at the bottom like it does for android.
I want to ask if there is any shadow support for UWP yet
No, no work has been started for UWP on this yet. In the issue 953 #leonskim mentioned that :
Shadow props(shadowOffset for an example) work on iOS, and Android has elevation to draw shadow under a view component. Any updates on adding shadow to the view component for Windows? It would be very helpful.
This issue addresses the WPF side implemented the shadow with pull request 998, but since UWP will have the different way that still not implemented.
You could open a new issue here to request the UWP side shadow feature.
I have a simple progress bar, it has a borderRadius and overflow set to hidden. I have a child of this, it has no borderRadius, and it is overflowing outside of the corners. Here is my markup:
<View style={style.progressbar}>
<View style={[style.progressbarfill, { width:'50%' }]} />
</View>
const style = {
progressbar: {
backgroundColor: '#ccc',
height: 25,
width: '90%',
borderRadius: 12,
overflow: 'hidden'
},
progressbarfill: {
backgroundColor: 'springgreen',
width: '10%',
height: '100%'
}
}
This is what it looks like:
I put arrows on where the green is covering the border. The green should not overflow outside the edges.
Does anyone know why this is?
Actually I'm testing it right now, seems to be working fine on iOS, but Android is the one having the issue with the overflow right now. It looks like that is still getting more support currently. A temporary fix, is to just add the same borderRadius on the progressbarfill.
Here is the issue on the React Native Docs:
The overflow style property defaults to hidden and cannot be changed
on Android This is a result of how Android rendering works. This
feature is not being worked on as it would be a significant
undertaking and there are many more important tasks.
Another issue with overflow: 'hidden' on Android: a view is not
clipped by the parent's borderRadius even if the parent has overflow:
'hidden' enabled – the corners of the inner view will be visible
outside of the rounded corners. This is only on Android; it works as
expected on iOS. See the corresponding issue.
I found that, in addition to overflow: 'hidden' needed on the parent, I also needed backgroundColor: 'transparent' added to the parent
Edit: I also found that sometimes testing this required a refresh of my app.