UIDatePicker重新定位到视图的底部

Question

我正在构建一个待办事项应用，用户可以在其中选择提醒选项。如果启用了提醒，则会启用UIDatePicker。我用故事板创建了主UI。所以我的初始UI就像这样

但是在禁用并再次启用提醒开关后，Datepicker会放在视图的顶部。我需要将它放在视图的底部。

我的ViewController代码是这样的

- (IBAction)isReminderSelected:(UISwitch *)sender {
    if([_reminderSetField isOn]){
    [_reminderSetField.viewForBaselineLayout addSubview: _reminderDatePicker];
}
else {
    [_reminderDatePicker removeFromSuperview];}
}

我通过故事板创建了主UI。然后在头文件中初始化datepicker ....

我的* .h文件

  @property (strong, nonatomic) IBOutlet UISwitch *reminderSetField;
  @property (strong, nonatomic) IBOutlet UIDatePicker *reminderDatePicker; 
  - (IBAction)isReminderSelected:(UISwitch *)sender;

Answer 1

您应该将选择器视图的y位置设置为

float y = [UIScreen mainScreen].bounds.size.height - _reminderDatePicker.frame.size.height;

[_reminderDatePicker setFrame:CGRectMake(0, y, _reminderDatePicker.frame.size.width, _reminderDatePicker.frame.size.height)];

Answer 2

我认为你应该尝试这样的

- (IBAction)isReminderSelected:(UISwitch *)sender {
    if([_reminderSetField isOn]){
        float y = [UIScreen mainScreen].bounds.size.height - _reminderDatePicker.frame.size.height;

        [_reminderDatePicker setFrame:CGRectMake(0, y, _reminderDatePicker.frame.size.width, _reminderDatePicker.frame.size.height)];
[yourView addSubView:_reminderDatePicker];
}
else {
        [_reminderDatePicker removeFromSuperview];}
}