bug

[yanglongji]

return this.presentAlert(result, metadata);
should be
return this.presentAlert(result, this.getPlatformData(metadata));

[yanglongji]

actually, should be :
return this.presentAlert(result, this.getPlatformData(metadata)).then(()=>{
resolve()
});
because the resolve used in alert() not the resolve in here, so if the alert return resolve(), here should also return resolve()

[MichaelMarner]

Thanks for reporting this issue. I should be able to have a fix out by Friday, but PRs are welcome if you want to have a look :)