未显示React Native IOS base64编码映像

5hcedyr0  于 2023-01-18  发布在  React
关注(0)|答案(2)|浏览(174)

我有一个react原生应用程序,需要显示产品的图像(如果存在)。我将base64编码的图像作为blob存储在本地SQLite上,并按如下方式渲染它们:

<Image source={{uri: "data:image/png;base64," + imgsource}} style={{height: 150, width: null, flex: 1}}/>

其中imgsource是从数据库检索的base64字符串。图像和其他信息直接从数据库存储在对象数组中。
我使用的是React原生0.61.5
在Android上一切都运行得很好,然而,在IOS上图像没有显示。我错过了什么吗?
波德菲尔

platform :ios, '9.0'
require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'
project 'sgeapp.xcodeproj'
target 'sgeapp' do
  # Pods for sgeapp
  pod 'FBLazyVector', :path => "../node_modules/react-native/Libraries/FBLazyVector"
  pod 'FBReactNativeSpec', :path => "../node_modules/react-native/Libraries/FBReactNativeSpec"
  pod 'RCTRequired', :path => "../node_modules/react-native/Libraries/RCTRequired"
  pod 'RCTTypeSafety', :path => "../node_modules/react-native/Libraries/TypeSafety"
  pod 'React', :path => '../node_modules/react-native/'
  pod 'React-Core', :path => '../node_modules/react-native/'
  pod 'React-CoreModules', :path => '../node_modules/react-native/React/CoreModules'
  pod 'React-Core/DevSupport', :path => '../node_modules/react-native/'
  pod 'React-RCTActionSheet', :path => '../node_modules/react-native/Libraries/ActionSheetIOS'
  pod 'React-RCTAnimation', :path => '../node_modules/react-native/Libraries/NativeAnimation'
  pod 'React-RCTBlob', :path => '../node_modules/react-native/Libraries/Blob'
  pod 'React-RCTImage', :path => '../node_modules/react-native/Libraries/Image'
  pod 'React-RCTLinking', :path => '../node_modules/react-native/Libraries/LinkingIOS'
  pod 'React-RCTNetwork', :path => '../node_modules/react-native/Libraries/Network'
  pod 'React-RCTSettings', :path => '../node_modules/react-native/Libraries/Settings'
  pod 'React-RCTText', :path => '../node_modules/react-native/Libraries/Text'
  pod 'React-RCTVibration', :path => '../node_modules/react-native/Libraries/Vibration'
  pod 'React-Core/RCTWebSocket', :path => '../node_modules/react-native/'

  pod 'React-cxxreact', :path => '../node_modules/react-native/ReactCommon/cxxreact'
  pod 'React-jsi', :path => '../node_modules/react-native/ReactCommon/jsi'
  pod 'React-jsiexecutor', :path => '../node_modules/react-native/ReactCommon/jsiexecutor'
  pod 'React-jsinspector', :path => '../node_modules/react-native/ReactCommon/jsinspector'
  pod 'ReactCommon/jscallinvoker', :path => "../node_modules/react-native/ReactCommon"
  pod 'ReactCommon/turbomodule/core', :path => "../node_modules/react-native/ReactCommon"
  pod 'Yoga', :path => '../node_modules/react-native/ReactCommon/yoga'

  pod 'DoubleConversion', :podspec => '../node_modules/react-native/third-party-podspecs/DoubleConversion.podspec'
  pod 'glog', :podspec => '../node_modules/react-native/third-party-podspecs/glog.podspec'
  pod 'Folly', :podspec => '../node_modules/react-native/third-party-podspecs/Folly.podspec'

#  pod 'RNVectorIcons', :path => '../node_modules/react-native-vector-icons'
  pod 'react-native-sqlite-storage', :path => '../node_modules/react-native-sqlite-storage'
  target 'sgeappTests' do
    inherit! :search_paths
    # Pods for testing
  end

  post_install do |installer|
      ## Fix for XCode 12.5 beta
      find_and_replace("../node_modules/react-native/React/CxxBridge/RCTCxxBridge.mm", "_initializeModules:(NSArray<id<RCTBridgeModule>> *)modules", "_initializeModules:(NSArray<Class> *)modules")
          find_and_replace("../node_modules/react-native/ReactCommon/turbomodule/core/platform/ios/RCTTurboModuleManager.mm", "RCTBridgeModuleNameForClass(strongModule))", "RCTBridgeModuleNameForClass(Class(strongModule)))")
  end
  
  use_native_modules!
end

def find_and_replace(dir, findstr, replacestr)
  Dir[dir].each do |name|
      text = File.read(name)
      replace = text.gsub(findstr,replacestr)
      if text != replace
          puts "Fix: " + name
          File.open(name, "w") { |file| file.puts replace }
          STDOUT.flush
      end
  end
  Dir[dir + '*/'].each(&method(:find_and_replace))
end
nqwrtyyt

nqwrtyyt1#

无论是给予宽度/高度还是Flex,两者都不能同时工作:

<Image source={{uri: "data:image/png;base64," + imgsource}} style={{height: 150, width: 150 }}/>
fruv7luv

fruv7luv2#

有3个可能的问题:
1.在某种程度上你如何编码你的图像-这个问题的例子和修复https://github.com/facebook/react-native/issues/34115

  1. SVG编码为base64 -https://github.com/facebook/react-native/issues/34115
    1.使用旧版本的翻板https://github.com/facebook/react-native/issues/28583

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