IOS-intermediate, ios

IOS-intermediate, ios

// Set the Row Height of tableView
Self. tableView. rowHeight = 100;
// Set the tableView split line style
// UITableViewCellSeparatorStyleNone does not display the split line
// Trim display split line (default) self. tableView. separatorStyle = UITableViewCellSeparatorStyleSingleLine; self. tableView. allowsSelection = NO; // do not allow selection // set the color of the split line
Self. tableView. separatorColor = [UIColor orangeColor]; // do not display the [tips] self. tableView. tableFooterView = [[UIView alloc] init]; // set (top, left, bottom, right) [top and bottom are invalid] self. tableView. separatorInset = UIEdgeInsetsMake (0, 10, 0, 10 );
Load cell CZFriendCell * cell = [tableView dequeueReusableCellWithIdentifier: @ "friend"]; return cell in stroyborud;


Common dataSource methods/*** how many groups numberOfSectionsInTableView */
-(NSInteger) numberOfSectionsInTableView :( UITableView *) tableView {return 2;
}

/*** Number of rows in a group numberOfRowsInSection */
-(NSInteger) tableView :( UITableView *) tableView numberOfRowsInSection :( NSInteger) section
{Return 2 ;}

/*** What is displayed in each group? cellForRowAtIndexPath */
-(UITableViewCell *) tableView :( UITableView *) tableView cellForRowAtIndexPath :( NSIndexPath *) indexPath {// 1 create Cellstatic NSString * reusedId = @ "item ";
// UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier: reusedId forIndexPath: indexPath]; ---------> wrong !!!!!
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier: reusedId];

If (cell = nil ){
Cell = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleDefault reuseIdentifier: reusedId];} // 2. obtain data LYGroup * group = _ groups [indexPath. section];
LYItem * item = group. items [indexPath. row];
Cell. textLabel. text = item. title; cell. imageView. image = [UIImage imageNamed: item. icon]; // 3. return cell ;}
/*** Group (header) Title titleForHeaderInSection */
-(NSString *) tableView :( UITableView *) tableView titleForHeaderInSection :( NSInteger) section {return @ "Header ";}

/*** Group (tail) Description titleForFooterInSection */
-(NSString *) tableView :( UITableView *) tableView titleForFooterInSection :( NSInteger) section
{Return @ "tail";}/*** grouping index sectionIndexTitlesForTableView */
-(NSArray *) sectionIndexTitlesForTableView :( UITableView *) tableView
{
// Return the title attribute of all group objects in the group array. The returned value is an array.
Return [self. carGroups valueForKeyPath: @ "title"];}
Common proxy method # pragma mark-proxy method
/*** Set the Row Height of each row. heightForRowAtIndexPath */
-(CGFloat) tableView :( UITableView *) tableView heightForRowAtIndexPath :( NSIndexPath *) indexPath
{
If (indexPath. row % 2 = 0 ){
Return 60;
} Else {
Return 100;
}
}
/*** Select a row of didSelectRowAtIndexPath */
-(Void) tableView :( UITableView *) tableView didSelectRowAtIndexPath :( NSIndexPath *) indexPath
{
// Zd long, long, int
NSLog (@ "the user selected the % zd group, row % zd", indexPath. section, indexPath. row );
}

// When a row is deselected, execute didDeselectRowAtIndexPath-(void) tableView :( UITableView *) tableView didDeselectRowAtIndexPath :( NSIndexPath *) indexPath
{
NSLog (@ "the user unselects the % zd group, row % zd", indexPath. section, indexPath. row );}
CELL common attributes // UITableViewCell * cell = [[UITableViewCell alloc] init]; // UITableViewCellStyleDefault only displays icons and names
// UITableViewCellStyleSubtitle display icon, name, description <below>
// UITableViewCellStyleValue1 display icon, name, description <later> // UITableViewCellStyleValue2 display name, description <later> // background View color UIView * backView = [[UIView alloc] init];
BackView. backgroundColor = [UIColor redColor];
// The priority of backgroundView is higher than that of backgroundColor.
Cell. backgroundView = backView;
// Background color
Cell. backgroundColor = [UIColor blueColor];

UIView * selectedView = [[UIView alloc] init];
SelectedView. backgroundColor = [UIColor blueColor];
// Select the background View
Cell. selectedBackgroundView = selectedView;

// Indicator-related
// Set the indicator type
Cell. accessoryType = UITableViewCellAccessoryDisclosureIndicator;
// Indicator view cell. accessoryView = [[UISwitch alloc] init];/*** retrieve cell from cache // 1 create Cell // 2. get Data // 3. return cell * // define the reuse ID
Static NSString * reuseId = @ "heroCell ";

// Find the reused cell in the buffer pool
UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier: reuseId];
// Create a new cell if no cell is found.
If (cell = nil ){
Cell = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleSubtitle reuseIdentifier: reuseId];
// NSLog (@ "create cell ");}
// Used to refresh the specified row [self. tableView reloadRowsAtIndexPaths: @ [indexPath] withRowAnimation: UITableViewRowAnimationNone]; // refresh the table [self. tableView reloadData];
// Scroll to make a region visible [self. tableView scrollRectToVisible: (CGRect) rect animated: YES];
// Specifies the row to which NSIndexPath * indexPath = [NSIndexPath indexPathForRow: self. tgs. count-1 inSection: 0]; [self. tableView scrollToRowAtIndexPath: indexPath atScrollPosition :( UITableViewScrollPositionMiddle) animated: YES]; // headerView self. tableView. tableHeaderView = [[UIView alloc] initWithFrame: CGRectMake (0, 0, 0, 15)]; // set the group spacing to 15 self. tableView. sectionHeaderHeight = 15;
Self. tableView. sectionFooterHeight = 0;

// Set the background image of tableView
Self. tableView. backgroundView = [[UIImageView alloc] initWithImage: [UIImage imageNamed: @ "bg"]; // rewrite the init method and set the group

• -(Instancetype) init {

Return [super initWithStyle: UITableViewStyleGrouped]; rewrite [[self alloc] Using: reuseId]; UITableViewCell rewrite [[self alloc] initWithStyle :( UITableViewCellStyleDefault) reuseIdentifier: ID]