Image IO - iOS Core Animation - page 308

dispatch_get_global_queue ( DISPATCH_QUEUE_PRIORITY_HIGH , 0 ), ^{
//setup
NSString *fileName = self . items [index];
NSString *pngPath = [[ NSBundle mainBundle ] pathForResource :filename
ofType : @"png" inDirectory:ImageFolder];
NSString *jpgPath = [[ NSBundle mainBundle ] pathForResource :filename
ofType : @"jpg" inDirectory:ImageFolder];
//load
NSInteger pngTime = [ self loadImageForOneSec :pngPath] * 1000 ;
NSInteger jpgTime = [ self loadImageForOneSec :jpgPath] * 1000 ;
//updated UI on main thread
dispatch_async ( dispatch_get_main_queue (), ^{
//find table cell and update
NSIndexPath *indexPath =
[ NSIndexPath indexPathForRow :index inSection : 0 ];
UITableViewCell *cell =
[ self . tableView cellForRowAtIndexPath :indexPath];
cell. detailTextLabel . text =
[ NSString stringWithFormat : @"PNG: %03ims JPG: %03ims" ,
pngTime, jpgTime];
});
});
}
- ( NSInteger )tableView:( UITableView *)tableView
numberOfRowsInSection:( NSInteger )section
{
return [ self . items count ];
}
- ( UITableViewCell *)tableView:( UITableView *)tableView
cellForRowAtIndexPath:( NSIndexPath *)indexPath
{
//dequeue cell
UITab leViewCell *cell =
[ self . tableView dequeueReusableCellWithIdentifier : @"Cell" ];
if (!cell)
{
cell = [[ UITableViewCell alloc ] initWithStyle :
UITableViewCellStyleValue1 reuseIdentifier : @"Cell" ];
}