Ios-pull up to load more interfaces

Ios-pull up to load more interfaces

I want to try to pull up and load more ways to start my own research journey. After two days, I finally made a page.

The reason for this slowness is that I don't know where to put the view shown on the top, so I can be pulled out when the scrollView is pulled to the bottom. There is also how to pull it out and stop it here. After downloading the example online, I studied it for two days:

 

First, kvo is used for listening when processing the orange view position in the image below;

 

First, an enumeration is used to indicate the status in which the view is refreshed:

 

Typedef enum {RefreshStateLoading = 1, // The refresh status is loading refreshstaterelal, // RefreshStateNomal before the release is completed in the drop-down list, // original status} RefreshState;

 

The following Class view describes how to refresh a view.

 

 

@ Interface FootView: UIView @ property (nonatomic, strong) UIActivityIndicatorView * activity; // activity indicator bar @ property (nonatomic, strong) UIImageView * imageView; // arrow image @ property (nonatomic, strong) UILabel * infolabel; // Text indicator @ property (nonatomic, assign) RefreshState refreshState; // refresh state-(void) refreshStateLoading; -(void) refreshStateNomal;-(void) refreshStateRelsease; @ end

# Import FootView. h @ implementation FootView @ synthesize activity; @ synthesize imageView; @ synthesize infolabel; @ synthesize refreshState;-(id) initWithFrame :( CGRect) frame {self = [super initWithFrame: frame]; if (self) {self. backgroundColor = [UIColor orangeColor]; // activity indicator initialization activity = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle: UIActivityIndicatorViewStyleGray]; activity. frame = CGRectMake (10, 0, 50, 70); [self addSubview: activity]; // arrow image initialization imageView = [[UIImageView alloc] initWithFrame: CGRectMake (10, 10, 30, 50)]; imageView. image = [UIImage imageNamed: @blackArrow.png]; [self addSubview: imageView]; // information label initialization infolabel = [[UILabel alloc] initWithFrame: CGRectMake (100, 70)]; infolabel. text = @ pull-down refresh ...; infolabel. font = [UIFont fontWithName: @ Helvetica size: 20]; infolabel. textAlignment = NSTextAlignmentCenter; infolabel. textColor = [UIColor blackColor]; [self addSubview: infolabel]; // set the initial state self. refreshState = RefreshStateNomal;} return self;} // initial state-(void) refreshStateNomal {self. refreshState = RefreshStateNomal; [self. activity stopAnimating]; self. infolabel. text = @ pull down to load more ...; self. imageView. layer. transform = CATransform3DMakeRotation (M_PI * 2, 0, 0, 1); self. imageView. hidden = NO;} // when requesting data-(void) refreshStateLoading {self. refreshState = RefreshStateLoading; self. imageView. hidden = YES; [UIView beginAnimations: nil context: nil]; self. infolabel. text = @ loading ...; [self. activity startAnimating]; [UIView commitAnimations];} // after the drop-down is complete-(void) refreshStateRelsease {self. refreshState = RefreshStateRelease; [UIView beginAnimations: nil context: nil]; self. infolabel. text = @ load after release ...; self. imageView. layer. transform = CATransform3DMakeRotation (M_PI, 0, 0, 1); [UIView commitAnimations] ;}@ end

Write table below

 

 

# Import
 
  
@ Interface MyTableVC: UITableViewController
  
   
@ Property (nonatomic, strong) NSMutableArray * dataArray; // data @ end
  
 

# Import MyTableVC. h # import FootView. h # define TABLE_CELL_HIGHT 50.0 @ interface MyTableVC () @ end @ implementation MyTableVC {FootView * footView;} @ synthesize dataArray;-(id) initWithStyle :( UITableViewStyle) style {self = [super initWithStyle: style]; if (self) {} return self;}-(void) viewDidLoad {[super viewDidLoad]; dataArray = [NSMutableArray arrayWithArray: @ [@ List 1, @ List 2, @ list 3, @ List 2, @ list 3, @ List 2, @ list 3, @ List 2, @ list 3, @ List 2, @ list 3, @ List 2, @ list 3, @ List 2, @ List 5]; [self addPullToRefreshFooter];} // Add FootView indicator-(void) addPullToRefreshFooter {// FootView initialization footView = [[FootView alloc] initWithFrame: CGRectMake (0, dataArray. count * 50,320,251)]; [self. tableView addSubview: footView]; // monitoring data array [self addObserver: self forKeyPath: @ dataArray options: NSKeyValueObservingOptionNew context: nil];} # pragma mark-Table view data source-(float) tableView :( UITableView *) tableView heightForRowAtIndexPath :( NSIndexPath *) indexPath {return TABLE_CELL_HIGHT;}-(NSInteger) Resume :( UITableView *) tableView {return 1;}-(NSInteger) tableView :( UITableView *) tableView numberOfRowsInSection :( NSInteger) section {return dataArray. count;}-(UITableViewCell *) tableView :( UITableView *) tableView metadata :( NSIndexPath *) indexPath {static NSString * inditifierCell = @ Cell; UITableViewCell * cell = [tableView metadata: inditifierCell]; if (cell = nil) {cell = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleDefault reuseIdentifier: inditifierCell];} cell. textLabel. text = [dataArray objectAtIndex: indexPath. row]; return cell;}-(void) tableView :( UITableView *) tableView didSelectRowAtIndexPath :( NSIndexPath *) indexPath {NSMutableArray * new = [[NSMutableArray alloc] initWithArray: dataArray]; [new addObject: @ James]; self. dataArray = new; [footView refreshStateNomal]; self. tableView. contentInset = UIEdgeInsetsMake (0, 0, 0, 0);} # pragma mark-kvo // listens to the dataArray to set the position of footview-(void) observeValueForKeyPath :( NSString *) keyPath ofObject :( id) object change :( NSDictionary *) change context :( void *) context {NSLog (@ % d, dataArray. count); NSMutableArray * mutableArray = [change objectForKey: @ new]; footView. frame = CGRectMake (0, TABLE_CELL_HIGHT * mutableArray. count, 320,251); [self. tableView reloadData] ;}# pragma mark-Scroller // call-(void) scrollViewDidScroll (UIScrollView *) scrollView {if (footView. refreshState = RefreshStateNomal & scrollView. contentOffset. y> scrollView. contentSize. height-scrollView. frame. size. height + 70) {[footView succeeded] ;}// call-(void) scrollViewDidEndDragging (UIScrollView *) scrollView willDecelerate :( BOOL) decelerate {if (footView. refreshState = RefreshStateRelease) {[UIView beginAnimations: nil context: nil]; self. tableView. contentInset = UIEdgeInsetsMake (0, 0, 70, 0); [footView refreshStateLoading]; [UIView commitAnimations];} @ end

 

Process some events in table:

To test whether the position of footview changes after data is added, a data entry is added when you click cell;

To test whether the page can be dragged for the second time after loading is complete, the foottview stops when the cell is clicked;