I have a HTML list of about 500 items and a "filter" box above it. I started by using jQuery to filter the list when I typed a letter (timing code added later): $('#filter').keyup( function() { var jqStart = (new Date).getTime(); var search = $(this).val().toLowerCase(); var $list = $('ul.ablist > li'); $list.each( function() { if ( $(this).text().toLowerCase().indexOf(search) === -1 ) $(this).hide(); else $(this).show(); } ); console.log('Time: ' + ((new Date).getTime() - jqStart)); } ); However, there was a couple of seconds delay after typing each letter (particularly the first letter). So I thought it may be slightly quicker if I used plain Javascript (I read recently that jQuery's each function is particularly slow). Here's my JS equivalent: document.getElementById('filter').addEventListener( 'keyup', function () { var jsStart = (new Date).getTime()...
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
ReplyDelete{
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 300, 37)];
label.text = [NSString stringWithFormat:@"something here"];
label.textAlignment = UITextAlignmentCenter;
label.backgroundColor = [UIColor clearColor];
[label autorelease];
return label;
}
or something like this.
You can implement this delegate method, which returns a CGFloat
ReplyDelete- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component
This is called on the picker view to determine row width.
No property of picker having set alignment capability.
ReplyDeleteso you need to hard code for this.
see this code
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component
{
return 25;
}
- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
NSString *title=[NSString stringWithFormat:@" %i",row];//here you give extra spaces.
return title;
}
Remember, the view in
ReplyDelete- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
is actually a UITableViewCell, so you can work with it like:
- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
static NSString *cellIdentifier = @"pickerViewCell";
UITableViewCell *cell = (UITableViewCell*)view;
if(cell==nil)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier] autorelease];
/** customize the cell **/
}
/** set the label **/
cell.textLabel.text = [dataSource objectAtIndex:row];
return cell;
}