Mobile Application Development(Iphone): May 2014

Lazy Loading

Step 1

First Create project like this......

http://adrianmobileapplication.blogspot.com/2014/07/customize-cell.html

Step 2

And change the Arrays like this.... its in ViewDidload method

----------------------------------------------------------------------------------------------------------

- (void)viewDidLoad

{

[super viewDidLoad];

// Do any additional setup after loading the view from its nib.

profileImageArray =[[NSMutableArray alloc]initWithObjects:

@"http://upload.wikimedia.org/wikipedia/commons/e/eb/SLIIT_MLB_1.jpg",

@"https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgGRrSBTxhJEVFgjD-bFIW8Qpqj4XFg4lk7B9J-KiPwdPTJTtHvBnZVKGUECOZc3ojXSj0ksd_jgkL5_fPd0MEYYVlNrQEccBtnvb8yRKQLsiYYXyh_qADCZjO9XJXMxv4_QVPNaMOYnEOp/s220/nwmpic.jpg",

@"http://www.userlogos.org/files/logos/robinhood/sliit400.png",

@"https://lh5.googleusercontent.com/-c6f2H9sAeDM/AAAAAAAAAAI/AAAAAAAAATM/9hzjaMbm4dM/photo.jpg",

@"https://lh4.googleusercontent.com/-qGRFN6zAkwA/AAAAAAAAAAI/AAAAAAAAAAA/2vec90BT9UQ/photo.jpg",

@"http://www.imagesbuddy.com/images/132/2014/01/purple-teddy-bear-happy-teddy-bear-day-2014.jpg",

@"https://lh3.googleusercontent.com/-8MeJ9g6xRso/AAAAAAAAAAI/AAAAAAAAAAA/1A6e1NaLimU/photo.jpg",

@"https://lh4.googleusercontent.com/-yaYTiufsV6I/AAAAAAAAAAI/AAAAAAAAAAA/TLDDaIWQ-Sk/photo.jpg",

@"http://www.interviewmagazine.com/files/2011/06/29/img-simon-van-booy_151144210967.png",

@"http://m.c.lnkd.licdn.com/mpr/pub/image-Dnol_IS4AkICXerqwCXULDwKFbuqEAnT7r_bL7l_Ftusk7LmDnobMsk4F33qksdVEyhq/ishara-sunjeewa.jpg",

nil];

nameArray =[[NSMutableArray alloc]initWithObjects:

@"Dhanushka Adrian",

@"Dinithe",

@"Nilakshan",

@"Niron",

@"Jude",

@"Malsha",

@"Kasun",

@"Thisra",

@"Suranga",

@"Ishara",

nil];

companyNameArray =[[NSMutableArray alloc]initWithObjects:

@"Vburst Software",

@"EZCrM",

@"Chello Dairy Products(Pvt)Ltd",

@"Vburst Software",

nil];

}

Step 3

---------------Change the tableView cellForRowAtIndexPath method-----------------------------

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

{

NSLog(@"cellForRowAtIndexPath");

NSString *uniqueIdentifier = @"CustomCell";

CustomCell *cell = nil;

cell = (CustomCell *) [profileTableView dequeueReusableCellWithIdentifier:uniqueIdentifier];

if(!cell)

{

NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"CustomCell" owner:nil options:nil];

for(id currentObject in topLevelObjects)

{

if([currentObject isKindOfClass:[CustomCell class]])

{

cell = (CustomCell *)currentObject;

break;

}

cell.nameLabel.text = [nameArray objectAtIndex:indexPath.row];

//image place holder---------------

[cell.profileImageView setImage:[UIImage imageNamed:@"defaultImgae.jpeg"]];

NSString *AllPicUrl=[profileImageArray objectAtIndex:indexPath.row];

cell.profileImageView.image = [UIImage imageNamed:[profileImageArray objectAtIndex:indexPath.row]];

//Lazy Loading------------------------------------------

dispatch_queue_t imageQueue = dispatch_queue_create("imageDownloder", nil);

dispatch_async(imageQueue, ^{

//This is what you will load lazily

NSURL *imageUrl=[NSURL URLWithString:AllPicUrl];

NSData *imageData = [NSData dataWithContentsOfURL:imageUrl];

dispatch_sync(dispatch_get_main_queue(), ^{

cell.profileImageView.image = [UIImage imageWithData:imageData];;

[cell setNeedsLayout];

});

//--------------------------------------------------------

return cell;

}

Step 4

Run It......!

Thursday, May 22, 2014

Lazy Loading

Lazy Loading