I embedded the navigation controller to the UITableViewController, and for every cell I need click the cell to push to another viewcontroller. The problem is when I enable the animation, it would be very laggy clicking the cell. I don't know why.
The code is following as:
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection: (NSInteger)section
{
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
UITableViewCell *cell = [[UITableViewCell alloc] init];
cell.textLabel.text = #"test";
cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
SliderViewController *vc = [[SliderViewController alloc] init];
[self.navigationController pushViewController:vc animated:NO];
}
I think it is quite normal so I don't know what's the problem.
Related
I have created an iOS app with UITableView.UITableView by default loads 25 records. I am scrolling the tableview to get another 25 records.
How do I get another set of data?
Here is my code.
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return timeList.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *CellIdentifier = #"Item";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell=[[UITableViewCell alloc]initWithStyle:
UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
NSDictionary *tmpDict = [timeList objectAtIndex:indexPath.row];
NSMutableString *text;
NSString *currentstatus;
text = [NSMutableString stringWithFormat:#"%#",[tmpDict objectForKeyedSubscript:startdate]];
currentstatus = [self statusString:[NSMutableString stringWithFormat:#"%#",[tmpDict objectForKeyedSubscript:status]]];
NSMutableString *detail;
detail = [NSMutableString stringWithFormat:#"User:%# , Hours:%# , Status: %# ",
[tmpDict objectForKey:username], [tmpDict objectForKey:hours], currentstatus];
cell.textLabel.text = text;
cell.detailTextLabel.text= detail;
cell.accessoryType =UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
-(void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
NSDictionary *tmpDict = [timeList objectAtIndex:indexPath.row];
NSString * storyboardName=#"Main";
UIStoryboard *storyboard =[UIStoryboard storyboardWithName:storyboardName bundle:nil];
EditViewController *evc =[storyboard instantiateViewControllerWithIdentifier:#"EditViewController"];
evc.startday =[NSMutableString stringWithFormat:#"%#",[tmpDict objectForKeyedSubscript:startdate]];
evc.user_id = [NSMutableString stringWithFormat:#"%#",[tmpDict objectForKeyedSubscript:user_id]];
evc.tab =#"wktime";
[self presentViewController:evc animated:NO completion:Nil];
}
First you have check whether the tableview reached last cell or not. If it is reached then again you have to reload the next set of data.
Use the below code to check whether the tableview reached last cell or not.
-(void)tableView:(UITableView *)tableView willDisplayCell (UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath
{
if(indexPath.row == timeList.count-1)
{
//Your code here
}
}
You can use delegate method of UISCrollView scrollViewDidEndScrolling to load more data and then you can refresh your tableView.
You can do it in a simple way. by adding below code in cellForRowAtIndexPath delegate method.
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.row == timeList.count-1) {
NSLog(#"load more");
}
.....
return cell;
}
if condition will be executed at the end of tableview, there you can add your logic to load more data's.
I have a very simple tableview in a xib file with it's delegate and datasource hooked up to TestVC. TestVC is simple:
#import "TestVC.h"
#implementation TestVC
- (UITableViewCell *)tableView:(UITableView *)_tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *IDEN = #"IDEN";
UITableViewCell *cell = [_tableView dequeueReusableCellWithIdentifier:IDEN];
if (!cell) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:IDEN];
}
cell.textLabel.text = #"test";
return cell;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return 10;
}
- (void)tableView:(UITableView *)_tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath {
NSLog(#"called");
[_tableView deselectRowAtIndexPath:indexPath animated:YES];
}
#end
When I click on a cell, it doesn't get deselected. I even put a log statement there to see if didDeselectRowAtIndexPath method is being called and it is.
What am i doing wrong?
You are using the wrong method
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
is the one you need
I don't know what to think...
I set up my main view to contain a UITableView. (I am using a UIPickerView as well on that view.)
I defined it to conform to the protocols:
UIPickerViewDelegate,
UIPickerViewDataSource,
UITableViewDataSource,
UITableViewDelegate
Announced the two methods in my view's h:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section;
implemented them in m:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell=[[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"cell"] autorelease];
cell.textLabel.text = [NSString stringWithFormat:#"Test %d",indexPath];
return cell;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 5;
}
I did set the delegate in my viewDidLoad:
searchTableView = [[UITableView alloc] init];
[searchTableView setFrame:CGRectMake(searchBar.frame.origin.x+10, 50, searchBar.frame.size.width-20, 300)];
searchTableView.delegate=self;
And yet, not numberOfRowsInSection nor cellForRowAtIndexPath are ever called!
What am I doing wrong ?
set the datasource:
[searchTableView setDataSource:self];
I am currently creating a simple grouped UITableView that when the user selects for example "Apple" I would like a image I have in my project to be loaded into a Image View of a Apple.
I have seen some examples on the internet but I am trying to see what else is out there.
Any suggestions would be greatly appreciated. Thanks.
Either set the cell.imageView.highlightedImage, or in the didSelectRowAtIndexPath method, change the cell.imageView.image from nil to some [UIImage imageNamed:#"myImage.png"]:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *kCustomCellID = #"com.me.foo.cell";
UITableViewCell *cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:kCustomCellID] autorelease];
cell.textLabel.highlightedTextColor = [UIColor blueColor];
cell.imageView.image = nil;
cell.imageView.highlightedImage = [UIImage imageNamed:#"myImage.png"];
return cell;
}
- (void)tableView:(UITableView *)tableView willDisplayCell:(iPadRootViewControllerTableCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath {
cell.imageView.contentMode = UIViewContentModeScaleAspectFit;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Do this if you didnt set the highlightedImage in cellForRowAtIndexPath
// [self tableView:tableView cellForRowAtIndexPath:indexPath].imageView.image = [UIImage imageNamed:#"myApple.png"];
}
I'm having trouble adding cells with different content to my app. I know (or think) this needs to be done using an array, but I'm new to xcode and objective-c so I'm not exactly sure how to do this. Any help is much appreciated. Thanks.
Here is a copy of my current code:
#import "RootViewController.h"
#import "CustomCell.h"
#implementation RootViewController
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
[super viewWillDisappear:animated];
}
- (void)viewDidDisappear:(BOOL)animated
{
[super viewDidDisappear:animated];
}
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
// Customize the number of sections in the table view.
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return 5;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
return 100;
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[CustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
cell.imageViews.image = [UIImage imageNamed:#"captainaq_4.jpg"];
cell.firstLabel.text = #"name ";
cell.secondLabel.text = #"second name";
cell.thirdLabel.text = #"third name";
cell.thirdLabel.textAlignment = UITextAlignmentCenter;
// Configure the cell.
return cell;
}
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete)
{
// Delete the row from the data source.
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert)
{
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:#"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc
{
[super dealloc];
}
#end
First, note that cellForRowAtIndexPath is being called multiple times-- once for each cell. I think your best option would be to declare an array, and populate it with the objects you want displayed, as follows:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
static NSString *days[] = {#"Mon", #"Tues", #"Wed", #"Thurs", #"Fri", #"Sat", #"Sun"};
static NSString *CellIdentifier = #"Cell";
CustomCell *cell = (CustomCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[CustomCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
[[cell textLabel] setText:days[indexPath.row]];
return cell;
}
Or populate the array somewhere else, if you need to manipulate the objects within it. In that case (assuming your array is populated with strings), your call to setText would look like:
[[cell textLabel] setText:[yourArray objectAtIndex:indexPath.row]];
It also appears you want to have a header with an image in it. In that case, use:
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section{
//create your UIImageView and add your image
return yourImageView;
}
ok... as far as I have seen , I dont think the following is valid.
cell.imageViews.image = [UIImage imageNamed:#"captainaq_4.jpg"];
cell.firstLabel.text = #"name ";
cell.secondLabel.text = #"second name";
cell.thirdLabel.text = #"third name";
cell.thirdLabel.textAlignment = UITextAlignmentCenter;
Correct me if I am wrong...
As far as I understood your question, what you got to do is that create labels and add them either programmatically or through Interface Builder ( whichever is easier for you) so that you can display whatever contents you want in the cell...
Here is an example of what you can do..
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; // adding indicator to the rows
}
// Configure the cell...
switch (indexPath.row) {
case 0:
cell.textLabel.text = #"John Doe";
cell.detailTextLabel.text = #"DEPT";
//cell.imageView.image = [UIImage imageNamed:#"meeting_color.png"];
break;
case 1:
cell.textLabel.text = #"Mary Smith";
cell.detailTextLabel.text = #"DEPT";
//cell.myImageView.image = [UIImage imageNamed:#"call_color.png"];
break;
case 2:
cell.textLabel.text = #"Bob Wong";
cell.detailTextLabel.text = #"DEPT";
//cell.myImageView.image = [UIImage imageNamed:#"calendar_color.png"];
break;
default:
break;
}
return cell;
}
Again that is a very simple way you can add content to a tableview...
You can create several different UITableViewCell or your own custom cell class and add it into array and display it later under:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
}
With this, you can have several distinct custom cell (What I mean distinct is totally different cell, such as first cell with image while the other doesn't have image).
While the other alternative is to do it inside the
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
as shown by using switch case. Either ways, it's about preference.
I suggest you to learn more about the basic use of classes, such as NSArray, NSMutableArray, and writing Objective-C language first. While it doesn't help much with learning developing app, it will speed up the learning curve during the real implementation of building program in Cocoa environment.