这是我的代码
exports.up = function(knex, Promise) {
return createNeedSchema()
.then(createNeed);
function createNeedSchema(){
return knex.schema.raw('CREATE SCHEMA need');
}
function createNeed(){
return knex.schema
.withSchema('need')
.createTable('need', (table) => {
table.foreign('id','user_id').references('id').inTable('member.user');
table.foreign('id','project_id').references('id').inTable('project.project');
table.timestamps();
});
}
});
运行此命令时,actionSheet刚出现在导航控制器的正上方,很小,有人知道解决方法吗?
答案 0 :(得分:0)
在iPad上,警报将使用UIPopoverPresentationController显示为弹出窗口,它要求您使用sourceView和sourceRect或barButtonItem为弹出窗口的显示定义锚点。
要支持iPad,请包含以下代码:
alertController.popoverPresentationController?.sourceView = self.view
alertController.popoverPresentationController?.sourceRect = self.myButton.frame
self.presentViewController(alertController, animated: true, completion: nil)
这是一个示例: 假设您有一个按钮,并且要在按钮下方显示警报控制器:
@IBOutlet weak var myBtn: UIButton!
let alertController = UIAlertController(title: "title :)", message:"message...", preferredStyle: .actionSheet)
let defaultAction = UIAlertAction(title: "cancel", style: .cancel, handler: nil)
let deleteAction = UIAlertAction(title: "delete", style: .destructive) { (action: UIAlertAction) in
//Do something
}
let addAction = UIAlertAction(title: "...", style: .default) { (action) in
//do something
}
alertController.addAction(addAction)
alertController.addAction(deleteAction)
alertController.addAction(defaultAction)
alertController.popoverPresentationController?.sourceRect = self.myBtn.frame
alertController.popoverPresentationController?.sourceView = self.view
self.present(alertController, animated: true, completion: nil)
如果用户在UITableView内的单元格上进行选择后要显示操作表。您可以使用以下代码:
alertController.popoverPresentationController.sourceView = cell
alertController.popoverPresentationController.sourceRect = cell.bounds