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React Nativeで UIコンポーネントをつくる
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matuyuji
May 25, 2016
Programming
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1k
React Nativeで UIコンポーネントをつくる
React NativeのUIコンポーネントをiOSでつくる方法を紹介します
matuyuji
May 25, 2016
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Transcript
3FBDU/BUJWFͰ 6*ίϯϙʔωϯτΛͭ͘Δ ؔϞόΠϧΞϓϦݚڀձ !NBUVZVKJ
@matuyuji safx-dev.blogspot.jp
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SOQN rnpm install react-native-linear-gradient <LinearGradient colors={['#abc', 'blue', '#fa1322']} style={{padding: 15,
borderRadius: 80}}> <Text style={{color: ‘#ffffff', backgroundColor: 'transparent'}}> Sample Button </Text> </LinearGradient> import LinearGradient from 'react-native-linear-gradient' OQNJHSOQN
#VJMEJOH $VTUPN$PNQPOFOU
w ์ࣹঢ়άϥσʔγϣϯ w ܘΛࢦఆͰ͖Δ w ৭ΛࢦఆͰ͖Δ
4XJGUͰՄೳͰ͕͢ɺϚΫϩ͕͑Δ0CK$ͷ΄͏ָ͕
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%6-& #import “RadialGradientViewManager.h” @implementation RadialGradientViewManager RCT_EXPORT_MODULE() - (UIView *)view {
return [[UIView alloc] init]; } @end
import { requireNativeComponent } from 'react-native'; const NativeRadialGradient = requireNativeComponent('RadialGradientView',
null); <View style={styles.container}> <Text style={styles.welcome}> Welcome to React Native! </Text> <Text style={styles.instructions}> To get started, edit index.ios.js </Text> <Text style={styles.instructions}> Press Cmd+R to reload,{'\n'} Cmd+D or shake for dev menu </Text> <NativeRadialGradient backgroundColor="blue" style={{width: 200, height: 200}} /> </View> ωΠςΟϒͷϚωʔδϟ ΛࣗಈͰݟ͚ͭΔ
$VTUPN7JFX @interface RadialGradientView : UIView @property(nonatomic, assign) CGFloat radius; @end
@implementation RadialGradientView - (void)drawRect:(CGRect)rect { CGFloat colorComponents[] = {1,0,0,1, 0,0,0,1}; CGPoint center = CGPointMake(self.bounds.size.width / 2, self.bounds.size.height / 2); CGColorSpaceRef space = CGColorSpaceCreateDeviceRGB(); CGContextRef context = UIGraphicsGetCurrentContext(); CGGradientRef gradient = CGGradientCreateWithColorComponents(space, colorComponents, nil, 2); CGContextSaveGState(context); CGContextDrawRadialGradient(context, gradient, center, 0.0, center, self.radius, 0); CGContextRestoreGState(context); CGColorSpaceRelease(space); CGGradientRelease(gradient); } @end ී௨ͷ6*ϏϡʔΛॻ͘ ˠࠇͷάϥσʔγϣϯ ܘ
@implementation RadialGradientViewManager RCT_EXPORT_MODULE() - (UIView *)view { return [[RadialGradientView alloc]
init]; } RCT_EXPORT_VIEW_PROPERTY(radius, CGFloat) @end <NativeRadialGradient radius={150} style={{width: 200, height: 200}} /> 7JFXͷϓϩύςΟΛ ΤΫεϙʔτͯ͠Δ
3$5$POWFSU #import "RCTConvert.h" @interface RadialGradientView : UIView @property(nonatomic, assign) CGFloat
radius; @property(nonatomic, retain) NSArray<NSString*>* colors; @end @implementation RadialGradientView - (void)drawRect:(CGRect)rect { CGFloat colorComponents[self.colors.count * 4]; CGFloat* p = colorComponents; NSArray<UIColor*>* cs = [RCTConvert UIColorArray: self.colors]; for (UIColor* c in cs) { CGFloat r, g, b, a; [c getRed:&r green:&g blue:&b alpha:&a]; *(p++) = r; *(p++) = g; *(p++) = b; *(p++) = a; } ɿ RCT_EXPORT_VIEW_PROPERTY(colors, NSArray) ϚωʔδϟͰˣΛՃ
import { processColor } from 'react-native'; class RadialGradient extends Component
{ render() { const { colors, ...otherProps } = this.props; return <NativeRadialGradient {...otherProps} colors={colors.map(processColor)} />; } } <RadialGradient colors={[‘#f00', 'yellow', ‘#0f0']} radius={150} style={{width: 200, height: 200}} /> )5.-ͷ৭Λ͍͍ײ͡ʹ ॲཧͯ͘͠ΕΔϝιου
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·ͱΊ w SOQNͰطଘίϯϙʔωϯτΛՃͰ͖Δ w ίϯϙʔωϯτࣗ࡞ΘΓͱ؆୯ w ࠷ॳ͔ΒϥΠϒϥϦͱͯ͠࠶ར༻͢ΔؾͳΒ react-native new-library --name
RadialGradient w $PDPB1PETͷͷΛ؆୯ʹ͑Δͷ͔ະௐࠪ ˠ1PETʹ3FBDU/BUJWF͕͋ΔΈ͍͕ͨͩʜ