React Native 0.50在xcode 11上崩溃问题

Unknown argument type '__attribute__' in method -
[RCTAppState getCurrentAppState:error:]. 
Extend RCTConvert to support this type

Exception '*** -[__NSArrayM objectAtIndexedSubscript:]: 
index 1 beyond bounds [0 .. 0]' was thrown while invoking getCurrentAppState on target AppState with params 
(
    2,
    3
)

修改React/Base/RCTModuleMethod.mm文件下面代码在运行就可修复

static BOOL RCTParseUnused(const char **input)
{
  return RCTReadString(input, "__unused") ||
         RCTReadString(input, "__attribute__((unused))");
}

修改成：

static BOOL RCTParseUnused(const char **input)
{
  return RCTReadString(input, "__attribute__((unused))") ||
         RCTReadString(input, "__attribute__((__unused__))") ||
         RCTReadString(input, "__unused");
}