public async Task <PermissionStatus> CheckAndRequestAsync(IPermissions.IPermission permission)
{
// https://docs.microsoft.com/zh-cn/xamarin/essentials/permissions?context=xamarin%2Fandroid&tabs=android#general-usage
var status = await permission.CheckStatusAsync();
if (status == PermissionStatus.Granted)
{
return(status);
}
if (status == PermissionStatus.Denied && DeviceInfo.Platform == DevicePlatform.iOS)
{
// Prompt the user to turn on in settings
// 提示用户在“设置”中启用
// On iOS once a permission has been denied it may not be requested again from the application
// 在iOS上，一旦权限被拒绝，就不能再次从应用程序请求权限
PromptUserGoToSettings(permission);
return(status);
}
if (permission.ShouldShowRationale())
{
// Prompt the user with additional information as to why the permission is needed
// 提示用户需要权限的其他信息
ShowRationale(permission);
}
status = await permission.RequestAsync();
if (status == PermissionStatus.Denied)
{
PromptUserGoToSettings(permission);
}
return(status);
}
/// <summary>
/// 提示用户需要权限的其他信息
/// </summary>
/// <param name="permission"></param>
protected virtual void ShowRationale(IPermissions.IPermission permission)
{
// 可由平台重写此函数实现，通常为显示一个吐司消息，因调用此函数后会立即开始重新申请权限
}
/// <summary>
/// 权限被拒绝，可提示用户在“设置”中启用，通常应有不再提示的选项
/// </summary>
/// <param name="permission"></param>
protected virtual void PromptUserGoToSettings(IPermissions.IPermission permission)
{
// 可由平台重写此函数实现，通常为显示一个UI上的弹窗，上有复选框不再显示
}