I'm building an app that lets the user select dates from a UITableView. The tableView is static and grouped. I've looked through many questions, including this one, trying to figure out how to accomplish this - but nothing seems to work optimal. Apple's calendar app features a very smooth and nice animation that none of the examples I've been through have managed to recreate.
This is my desired result:
Could someone point me to a tutorial or explain how I can accomplish such a smooth animation with the most concise and straight forward way of doing it, like we see in the calendar app?
Thanks alot!
Erik
I assume you're using storyboard, the example is with UIPickerView
:
Create a tableviewcell right under the cell that contains the textfield you want to fill and set the cells row height to 216.0 in the inspector and add a UIPickerView to that cell.
Next connect the UIPickerView via Outlet to your viewcontroller and add the following property to your ViewController.h:
@property (weak, nonatomic) IBOutlet UIPickerView *statusPicker;
@property BOOL statusPickerVisible;
In your ViewController.m do in viewWillAppear
self.statusPickerVisible = NO;
self.statusPicker.hidden = YES;
self.statusPicker.translatesAutoresizingMaskIntoConstraints = NO;
Add two methods:
- (void)showStatusPickerCell {
self.statusPickerVisible = YES;
[self.tableView beginUpdates];
[self.tableView endUpdates];
self.statusPicker.alpha = 0.0f;
[UIView animateWithDuration:0.25
animations:^{
self.statusPicker.alpha = 1.0f;
} completion:^(BOOL finished){
self.statusPicker.hidden = NO;
}];];
}
- (void)hideStatusPickerCell {
self.statusPickerVisible = NO;
[self.tableView beginUpdates];
[self.tableView endUpdates];
[UIView animateWithDuration:0.25
animations:^{
self.statusPicker.alpha = 0.0f;
}
completion:^(BOOL finished){
self.statusPicker.hidden = YES;
}];
}
In heightForRowAtIndexPath
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
CGFloat height = self.tableView.rowHeight;
if (indexPath.row == 1){
height = self.statusPickerVisible ? 216.0f : 0.0f;
}
return height;
}
In didSelectRowAtIndexPath
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.row == 0) {
if (self.statusPickerVisible){
[self hideStatusPickerCell];
} else {
[self showStatusPickerCell];
}
}
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}