I've got a problem with UIImage in the tableviewcell that are in storyboard.
When i scroll cell in the tableview it request the data from the server everytime so cell is very slow.
I've watched this video
but it does not work on storyboard, because storyboard donesn't have UITableViewCell NIB file (its integrate to the storyboard)
What I do in my project
I create object and link to my outlet property
I use json to get data from internet.
I display it on the tableview.
You can download my entire project file here. This is code in the UITableview.m cellForRowAtIndexPath:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"MyCell";
MyCustomCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
// Configure the cell...
NSDictionary *entry = [ _entries objectAtIndex:indexPath.row];
cell.boomTitle.text = [entry objectForKey:#"body"];
NSString *imageURL=[NSString stringWithFormat:#"http://kelnakub.co.cc/upload/%i.jpg",[[entry objectForKey:#"IdEntry"] intValue]];
for(NSDictionary *dic in _entries)
{
NewsFeed *myNewsFeed = [[NewsFeed alloc]init];
myNewsFeed.thumNail = [dic objectForKey:#"IdEntry"];
}
NSURL *url = [NSURL URLWithString:imageURL];
NSData *imageData = [NSData dataWithContentsOfURL:url];
cell.boomImage.image = [UIImage imageWithData:imageData];
cell.boomDate.text = [entry objectForKey:#"dateCreated"];
return cell;
}
You can use UITableViewCell in a NIB file using storyboard. Just use prototype cells and, instead of designing the cell on the Storyboard, create a new NIB and design the UITableViewCell on it (Storyboard's UITableView remains empty of cells).
Then, in the code, you can load the cell using something like: UITableViewCell * MyCustomCell = [[[NSBundle mainBundle] loadNibNamed:#"MyCustomCell" owner:self options:nil] objectAtIndex:1];
Related
I have an array of data. And wr my data are not displaying in the screen. Not sure, what i am missing.
#property NSMutableArray *NotifTotal;
#interface HomeVC ()<UITableViewDelegate, UITableViewDataSource>
#end
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [self.NotifTotal count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:
(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"FilterTableViewCell";
FilterTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
NSDictionary *dict;
dict = [self.NotifTotal objectAtIndex:indexPath.row];
NSLog(#"%#", dict); // data is coming.
NSString* salt = [dict objectForKey:#"salt"];
NSString* name = [dict objectForKey:#"Name"];
NSLog(#"%#%#", name,swerk); // in console i can print the data
cell.sLabel.text = [NSString stringWithFormat: #"%#", salt];
cell.nLabel.text = [NSString stringWithFormat: #"%#", name];
return cell;
}
Why my data is not showing in my screen.I added the delegate, data source also in my screen.Any solution ?
You said "I added the delegate, data source also in my screen" but it is not very clear to me by that you meant conforming your HomeVC to UITableViewDelegate and UITableViewDataSource as your posted code or you actually set the delegate of your UITableView to HomeVC. So here are something you should check:
Set datasource of your UITableView to HomeVC using Interface Builder or following code:
self.tableView.dataSource = self; // I am assuming self == HomeVC instance
Make sure [self.NotifTotal count] > 0.
Make sure it is not about UITableView's configuration issue by adding a break point to cellForRowAtIndexPath and confirm it called.
If it isn't: go back to 2 points above.
If it is: this is UI issue, let's check if your cells's height is near 0 or they have a transparent color and so on. You can use Xcode's View Debugging tool to debug the issue.
Since you haven't mentioned having registered the cell identifier yet, I assume that's the problem. One way to do this is in your storyboard or xib. Select the prototype cell in your tableview, and set the "identifier" field (in the Attributes inspector pane of Interface Builder). Set it to "FilterTableViewCell".
This looks like a xib problem. I added a bit of code in the middle.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"FilterTableViewCell";
FilterTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
//Add this part
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"FilterTableViewCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
//end
NSDictionary *dict;
dict = [self.NotifTotal objectAtIndex:indexPath.row];
NSLog(#"%#", dict); // data is coming.
NSString* salt = [dict objectForKey:#"salt"];
NSString* name = [dict objectForKey:#"Name"];
NSLog(#"%#%#", name,swerk); // in console i can print the data
cell.sLabel.text = [NSString stringWithFormat: #"%#", salt];
cell.nLabel.text = [NSString stringWithFormat: #"%#", name];
return cell;
}
I'm trying to insert data into the rows I've created, I will get all info in my Log but it only shows the last info in all of my rows. Could anyone suggest a way to avoid this error?
Please offer me some advice thanks!
You are never re-populating the cells, actually. You are creating the initial visible cells, and just reusing them with the same content.. please look below:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath
*)indexPath
{
static NSString *CellIdentifier = #"TestCell";
TestCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
// HERE YOU ONLY WANT TO INSTANTIATE THE CELL
NSArray *topObjects = [[NSBundle mainBundle] loadNibNamed:#"TestCell" owner:nil options:nil];
for (id currentObject in topObjects)
{
if([currentObject isKindOfClass:[TestCell class]])
{
cell = (TestCell *) currentObject;
break;
}
}
}
// HERE YOU WOULD ACTUALLY POPULATE THE CELL WITH DATA
NSArray *array = [server get_texts:10 offset:0 sort_by:0 search_for:#""];
NSMutableString *s = [[NSMutableString alloc] init];
for (testMetaData *m in array){
[s appendFormat:#"%# %# \n", m.title,m.note];
cell.title.text = m.title;
NSLog(#" title %# ", m.title);
}
return cell;
}
Some info about UITableView:
So, a properly setup tableView only allocates and uses a limited number of UITableViewCells. After allocating, say 5 cells (this number is determined by "How many cells can you see at any given time?"), it will take an already created cell that has been scrolled out of the visible area, and gives it back to you in that method you are using, so you can re-populate it. So, cell variable will not be nil at that time, and your server code never gets called.
I think it has to do with your for loop.
NSMutableString *s = [[NSMutableString alloc] init];
for (testMetaData *m in array){
[s appendFormat:#"%# %# \n", m.title,m.note];
cell.title.text = m.title;
NSLog(#" title %# ", m.title);
}
Your cell.title.text = m.titlewill get the last m.title info at the end of the for loop.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath
*)indexPath
{
//Load Cell for reuse
static NSString *CellIdentifier = #"TestCell";
TestCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell =[ [[NSBundle mainBundle] loadNibNamed:#"TestCell" owner:nil options:nil] lastObject];
}
//appending text and config cell
NSArray *array = [server get_texts:10 offset:0 sort_by:0 search_for:#""];
NSString *t = [array objectAtIndex:indexPath.row];
//Config cell - Not sure what you want. Maybe 10 different rows
cell.title.text = t;
return cell;
}
I have created the Custom tableView and using custom tableView class in Other class to Show the tableView..
I am Loading the image from Server and displaying it in the tableViewRow.. each image is different in it..
On Screen only 7 out of 10 images will come, and when I scroll down the first 3 images are repeating for some time and when those images get load its showing proper images.. but initially till new images will come its showing old images, I want to put a activity indicator to show that the images are loading instead of old images..
I want to add activity Indicator in the place of image, till the image get load..
My code is...
self.tableViewX = tableView;
static NSString *simpleTableIdentifier = #"SimpleTableCell";
SimpleTableCell *cell = (SimpleTableCell *)[tableView1 dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"SimpleTableCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^
{
NSString *imageURL = [NSString stringWithFormat: #"www.xyz.image.png"];
cell.thumbnailImageView.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:imageURL]]];
});
Please assist me with some sample code..
You can use "AsyncImageView" class files it will load image synchronically and it shows the activity indicator while image loading
You can download "AsyncImageView" class files from following link:-
https://www.dropbox.com/s/peazwjvky9fsjd7/Archive.zip
in .m file import AsyncImageView Class
#import "AsyncImageView.h"
in your tableview cell at indexpath method
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = #"SimpleTableCell";
SimpleTableCell *cell = (SimpleTableCell *)[tableView1 dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"SimpleTableCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
NSString *imageURL = [NSString stringWithFormat: #"www.xyz.image.png"];
AsyncImageView *async = [[AsyncImageView alloc]initWithFrame:CGRectMake(0, 0, width, height)];
[async loadImageFromURL:[NSURL URLWithString:imageURL]];
[cell.thumbnailImageView addSubview:async];
}
try this your problem will solve.
I am parsing RSS to UITableview and the data looks as it should but when I select one of the field in the UITableview it opens different data then what it should. Also when I scroll the tableview the same field that I have selected gives again different data.
So please where could I made my mistake?
The RSS link: http://www.luaikalkatawi.me/picksound
Thanks from now.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
NSString *trimed = [[containerObject.track init] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSLog(#"The link is %#", trimed);
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString* cellIdentifier = #"ImgCell";
ImgCell *cell = (ImgCell*)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:cellIdentifier owner:nil options:nil];
cell = (ImgCell*)[nib objectAtIndex:0];
}
containerObject = [objectCollection objectAtIndex:indexPath.row];//use the common object again for holding the corresponding array object
///// Image reloading from HJCacheClasses
[cell.img clear];
NSString *str1 = containerObject.image; //we use image property of rss object to set the image
NSString *trimmedString = [str1 stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSURL *url = [NSURL URLWithString:trimmedString];
cell.img.url = url; //set the url to img view
[self.imgMan manage:cell.img];
cell.mainText.text = containerObject.title; //title member variable for setting title
cell.detailText.text = containerObject.description;//desc variable foe
return cell;
}
I don't know why this is confusing to you, but the correct containerObject, should be accessed in the didSelectRowAtIndexPath.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
containerObject = [objectCollection objectAtIndex:indexPath.row];
NSString *trimed = [[containerObject.track init] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
NSLog(#"The link is %#", trimed);
}
okay, here's what I've been scratching my head over for the last few days. I have created a custom cell for my table view. I have created a separate class (customCell.h) for this cell and linked them together in Xcode.
The custom cell has four UIlabels which I have declared in the .h file of the custom cell and linked to the custom cell via storyboard.
I have imported the customCell.h header file into the .h file of my table view controller
I am trying to do a search on twitter, and then populate the table view and custom cell with the details of the various tweets. The issue is I don't know how to link the results of the tweet to the 4 UIlabel outlets in my custom cell.
When I am declaring some of the outlets of the custom cell in my table view implementation file (even though I've imported the .h file of the custom cell) xcode is saying that it does not recognise the name
I've copied the coding below detailing as far as I can get. Any help would be much appreciated. Thanks in advance
- (void)fetchTweets
{
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSData* data = [NSData dataWithContentsOfURL:
[NSURL URLWithString: #"THIS IS WHERE MY TWITTER SEARCH STRING WILL GO.json"]];
NSError* error;
tweets = [NSJSONSerialization JSONObjectWithData:data
options:kNilOptions
error:&error];
dispatch_async(dispatch_get_main_queue(), ^{
[self.tableView reloadData];
});
});
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return tweets.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"TweetCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
NSDictionary *tweet = [tweets objectAtIndex:indexPath.row];
NSString *text = [tweet objectForKey:#"text"];
NSString *name = [[tweet objectForKey:#"user"] objectForKey:#"name"];
NSArray *arrayForCustomcell = [tweet componentsSeparatedByString:#":"];
cell.textLabel.text = text;
cell.detailTextLabel.text = [NSString stringWithFormat:#"by %#", name];
return cell;
}
You are creating an instance of the UITableViewCell, which is the default class for tableview cells. In your case, you have to create an instance of your customCell class (which extends the UITableViewCell class). You have to do this in you cellForRowAtIndexPath method:
static NSString *CellIdentifier = #"TweetCell";
customCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if ( cell == nil )
{
cell = [[customCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
// Get the tweet
NSDictionary *tweet = [tweets objectAtIndex:indexPath.row];
I hope this helped you out!
Steffen.