關于ion-picker的默認值設定，群里有人說找了幾天沒找到相關資料，不至于吧？
其實每列都有selectedIndex屬性，設置下就好了：
async showBasicPicker() {
const opts: PickerOptions = {
buttons: [
{
text: 'Cancel',
role: 'cancel'
},
{
text: 'Done'
}
],
columns: [
{
name: 'framework',
selectedIndex: 2,
options: [
{ text: 'Angular', value: 'A' },
{ text: 'Vue', value: 'B' },
{ text: 'React', value: 'C' }
]
}
]
};
const picker = await this.pickerCtrl.create(opts);
picker.present();
}
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