I want to implement a UIsearchBar with an array. I have an array with city names. How do I implement it with a table view?
First you should set the delegate of UISearchBar and to create an other NSMutableArray with filtered results. The dataSource for your UITableView will now release uppon this new array.
Then, add the delegate method like this :
-(void)searchBar:(UISearchBar*)searchBar textDidChange:(NSString*)text {
filteredTableData = [[NSMutableArray alloc] init];
for (Food* food in allTableData)
{
NSRange nameRange = [food.name rangeOfString:text options:NSCaseInsensitiveSearch];
NSRange descriptionRange = [food.description rangeOfString:text options:NSCaseInsensitiveSearch];
if(nameRange.location != NSNotFound || descriptionRange.location != NSNotFound)
{
[filteredTableData addObject:food];
}
}
[self.tableView reloadData];
}
For the full code, see here : Filtering a UITableView with a search bar
Hope this helps.
Related
I'm all self taught so please keep the techincal jargin to a minimum. Theoretically if I had a method and it had a parameter that is the name of an array. How do I check to see if that array index 5 is equal to #"Yes" or #"No". I know it's one of these because its testing to see if the picture is appearing in the veiw controller. Here is an example:
-(void)methodName :(NSMutableArray *)arrayNameInMethod {
if ( [NSMutableArray *(arrayNameInMethod) indexOfObject:5] == #"Yes"){
//Hide a different picture assocciated with the Array
} else {
//Unhide a different picture assocciated with the Array
};
Also how do you do use the parameter "arrayNameInMethod" to replace the object. Basically:
if(Picture Clicked and picture is Unhidden) {
[NSMutableArray *(differentArrayNameInMethod) replaceObjectAtIndex:5 withObject: #"True)
};
(this is all in another method)
Comment #2: You can't use the parameters the same way because it's a string. You can't access an array with a name as a string.
Thank you so much!
I think what you will need is a dictionary, mapping the name to the array. I will give a barebones implementation:
#interface YourClass()
{
NSMutableDictionary *_arrayMap;
}
#end
#interface YourClass
- (instancetype)init
{
self = [super init];
if (self) {
// You might do this somewhere else, like viewDidLoad:
_arrayMap = [NSMutableDictionary new];
}
return self;
}
- (void)someMethod
{
// Some functionality to add a new array:
// Note the array contains NSNumber and NSString objects:
_arrayMap[#"sampleName"] = [#[ #(0), #"one", #(2.0), #"three", #(4), #(YES)] mutableCopy];
}
-(BOOL)checkForConditionInArrayNamed:(NSString *)arrayName
{
BOOL retval = NO;
NSMutableArray *array = _arrayMap[arrayName];
if ([array count] > 5) {
id obj = array[5];
if ([obj isKindOfClass:[NSNumber class]])
retval = [obj boolValue];
}
return retval
};
#end
You then call checkForConditionInArrayNamed: to check for the condition of the named array and act accordingly.
Hey guys I have this piece of code for a UISearchBar that searches dynamically. But since the DataSource is a VERY large NSArray the search process has an annoying lag that I need/must/have to get rid of.
The problem is that I could not find a way to do the search in a non-dynamically way like the user would type the search string and only after hitting the Search button on the keyboard is when the search process would being and present the result.
My code is as follows:
-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
if (searchText.length == 0) {
isFiltered = NO;
} else {
isFiltered = YES;
filteredCodigos = [[NSMutableArray alloc] init];
for (NSDictionary *item in values) {
NSString *strSymbol = [item objectForKey:#"symbol"];
NSString *strName = [item objectForKey:#"name"];
NSRange strRangeSymbol = [strSymbol rangeOfString:searchText options:NSCaseInsensitiveSearch];
NSRange strRangeName = [strName rangeOfString:searchText options:NSCaseInsensitiveSearch];
if ((strRangeSymbol.location != NSNotFound) || (strRangeName.location != NSNotFound)) {
[filteredCodigos addObject:item];
}
}
}
[_tableView reloadData];
}
You can use the searchBarSearchButtonClicked: search bar delegate method to trigger the search instead of searchBar:textDidChange:.
You can also, if using searchBar:textDidChange:, require that the length of the search string is at least 2 or 3 characters long before performing a search.
You should probably also consider changing your data source so, rather than using an array, you're using Core Data (or similar). Both so you don't need everything in memory at once and so you can run efficient searches.
Hi i have written a function to check if there is any empty cell in a multicolumn nstableview like below.However this function is not working and always checks for the columns in the first row only.. any suggestions.and what is the right way to check for it
-(BOOL)isTableRowsContainingEmptyCells
{
for(int row=0;row< [[self.myarray arrangedObjects] count];row++)
{
NSTableColumn *column1 = [self.formFieldValues
tableColumnWithIdentifier:#"A"];
NSTableColumn *column2 = [self.formFieldValues
tableColumnWithIdentifier:#"B"];
NSCell *cell1 = [column1 dataCellForRow:row];
NSCell *cell2 = [column2 dataCellForRow:row];
NSLog(#"cell1 %# cell2 %#",cell1,cell2);
if([[cell1 stringValue] isEqualToString:#""]||[cell1 stringValue]==nil||[[cell2 stringValue] isEqualToString:#""]||[cell2 stringValue]==nil)
{
return YES;
}
}
return NO;
}
Try like this
NSCell *cll=[tableView preparedCellAtColumn:0 row:0];
NSString *str=[cll stringValue];
NSInteger len=[str length];
if (len ==0)
{
NSLog(#"NO data")
}
Can't handle simple problem - adding cells to UITableView.
I have single-view application, with added from Objects - Table View and simple NSArray (deseriliazed json from internet-grabbed data).
- (void) didLoadMusicList:(APIDownload *)request
{
NSLog(#"Music list loaded");
CJSONDeserializer *deserializer = [CJSONDeserializer new];
NSDictionary *dict = [deserializer deserializeAsDictionary:request.downloadData error:nil];
NSArray *response = [dict objectForKey:#"response"];
NSArray *audios = [response subarrayWithRange:NSMakeRange(1, response.count-1)];
for(int i = 0; i < audios.count; i++)
{
NSDictionary *audio = [audios objectAtIndex:i];
// add a cell?
}
}
So, how do I add cell for each element?
You need to implement the UITableViewDatasource on your view controller. You can use the same array to provide the data to the cells, and return them using the cellForRowAtIndexPath datasource method. You also need to provide with the count of cells on your tableView.
Check this documentation: http://developer.apple.com/library/ios/#documentation/uikit/reference/UITableViewDataSource_Protocol/Reference/Reference.html
I am trying to implement a method to clear the NSTableView of all items AND columns. But I get a crash when I try to implement the following:
- (void)clearResultData
{
[resultArray removeAllObjects];
NSArray *tableCols = [resultTableView tableColumns];
if ([tableCols count] > 0)
{
id object;
NSEnumerator *e = [tableCols objectEnumerator];
while (object = [e nextObject])
{
NSTableColumn *col = (NSTableColumn*)object;
[resultTableView removeTableColumn:col];
}
}
[resultTableView reloadData];
}
Well, if it's any help you can remove all the columns like this:
- (void)removeAllColumns
{
while([[tableView tableColumns] count] > 0) {
[tableView removeTableColumn:[[tableView tableColumns] lastObject]];
}
}
The NSArray returned by tableColumns is changed by removeTableColumn. Do not assume it is unchanged.
Although it is returned as a non-mutable NSArray, the underlying implementation is being modified and it is not safe to use NSEnumerator with collections that are modified. In the while loop, you are sending a nextObject message to an enumerator whose current object was just deleted -- so bad things can happen!
Here's a more efficient implementation:
NSTableColumn* col;
while ((col = [[tableView tableColumns] lastObject])) {
[tableView removeTableColumn:col];
}
When there are no columns in the table view: tableColumns returns an empty array, lastObject on an empty array returns nil, col is assigned the value of nil, the condition is false and the while loop finishes.
[[[_tableView tableColumns] copy] enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
[_tableView removeTableColumn:obj];
}];
Here is a Swift implementation:
tableView.tableColumns.forEach({tableView.removeTableColumn($0)})