iOS在UITableViewCells之间显示UIPickerView [英] iOS Show UIPickerView between UITableViewCells
问题描述
在iOS 7中,鼓励开发人员在需要输入时在表格单元格之间显示日期选择器,然后在完成后隐藏它们。如何实现这种效果?
In iOS 7, developers are encouraged to show date pickers between table cells when needed for input, and then hide them when done. How can I achieve this effect?
推荐答案
Vasilica Costescu在这里有一个很棒的教程:
http://masteringios.com/blog/2013/10/31/ios-7- in-line-uidatepicker /
Vasilica Costescu has a great tutorial on it here: http://masteringios.com/blog/2013/10/31/ios-7-in-line-uidatepicker/
对于静态表:
http://masteringios.com/blog/2013/11/18/ios-7-in-line -uidatepicker-part-2 /
示例代码: https://github.com/costescv/InlineDatePicker
关键位是隐藏/显示方法:
The key bits are the hide/show methods:
- (void)showDatePickerCell {
self.datePickerIsShowing = YES;
[self.tableView beginUpdates];
[self.tableView endUpdates];
self.datePicker.hidden = NO;
self.datePicker.alpha = 0.0f;
[UIView animateWithDuration:0.25 animations:^{
self.datePicker.alpha = 1.0f;
}];
}
- (void)hideDatePickerCell {
self.datePickerIsShowing = NO;
[self.tableView beginUpdates];
[self.tableView endUpdates];
[UIView animateWithDuration:0.25
animations:^{
self.datePicker.alpha = 0.0f;
}
completion:^(BOOL finished){
self.datePicker.hidden = YES;
}];
}
此UITableViewDelegate方法将通过将其高度设置为0来隐藏该行:
And this UITableViewDelegate method will "hide" the row by setting its height to 0 :
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.section == 0 && indexPath.row == 4 && self.datePickerIsShowing == NO){
// hide date picker row
return 0.0f;
}
return [super tableView:tableView heightForRowAtIndexPath:indexPath];
}
您可以通过按钮调用隐藏/显示方法,也可以选择行在表中。 (注意:如果其他行有文本字段,那么您可能需要在textFieldDidBeginEditing委托方法中隐藏datePicker)。
You can call the hide/show methods from a button or just by selecting rows in the table. (Note: If there are text fields the other rows, then you may need to hide the datePicker in the textFieldDidBeginEditing delegate method).
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
if (indexPath.section == 0 && indexPath.row == 4) {
if (self.datePickerIsShowing){
[self hideDatePickerCell];
}else {
[self showDatePickerCell];
}
}
[self.tableView deselectRowAtIndexPath:indexPath animated:YES];
}
编辑:小心使用多个内联选择器在一张表中查看。我注意到它们往往从故事板上加载速度很慢: iOS 7使用UIPickerView 打开UITableViewController的速度很慢
Be careful using more than a couple of these inline picker views on in a single table. I've noticed that they tend to load very slowly from storyboards: iOS 7 slow to open UITableViewController with UIPickerView
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