iOS学习之——下拉刷新

来源：互联网发布：大数据为实体店编辑：程序博客网时间：2024/06/06 16:34

在UITableView中实现下拉刷新
这里写图片描述
下拉时实现
创建基于UITableViewController类的TableViewController类
TableViewController.h

#import <UIKit/UIKit.h>@interface TableViewController : UITableViewController@property(nonatomic)int count;@property(nonatomic,retain)NSMutableArray *countArr;@end

TableViewController.m

#import "TableViewController.h"@interface TableViewController ()@end@implementation TableViewController- (void)viewDidLoad {    [super viewDidLoad];    self.count = 0;    self.countArr = [[NSMutableArray alloc]initWithCapacity:16];    UIRefreshControl *refresh = [[UIRefreshControl alloc]init];    //设置颜色    refresh.tintColor = [UIColor redColor];    //设置刷新时提示字    refresh.attributedTitle = [[NSAttributedString alloc] initWithString:@"下拉刷新"];    //添加动作    [refresh addTarget:self action:@selector(refreshView:) forControlEvents:UIControlEventValueChanged];    self.refreshControl = refresh;}//实现刷新-(void)refreshView:(UIRefreshControl *)refresh{    if(refresh.refreshing){        refresh.attributedTitle = [[NSAttributedString alloc]initWithString:@"正在加载，请稍后......"];        [self performSelector:@selector(handleData) withObject:nil afterDelay:2];    }}//刷新数据-(void)handleData{    NSDateFormatter *formatter = [[NSDateFormatter alloc]init];    //设置格式    [formatter setDateFormat:@"MMM d,h:mm:ss a"];    //创建字符串对象    NSString *lastUpdated = [NSString stringWithFormat:@"最后加载的内容为： %@", [formatter stringFromDate:[NSDate date]]];    self.refreshControl.attributedTitle = [[NSAttributedString alloc]initWithString:lastUpdated];    self.count++;    //添加对象    [self.countArr addObject:[NSString stringWithFormat:@"%d. %@",self.count,[formatter stringFromDate:[NSDate date]]]];    NSLog(@"%@",self.countArr);    //结束刷新    [self.refreshControl endRefreshing];    [self.tableView reloadData];}- (void)didReceiveMemoryWarning {    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}#pragma mark - Table view data source//获取表视图的块- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {    return 1;}//获取行数- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {    return self.countArr.count;}//获取某一行的数据- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {    static NSString *CellIdentifier = @"Cell";    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];    if(cell ==  nil)    {        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];    }    //设置文本内容    cell.textLabel.text = [self.countArr objectAtIndex:indexPath.row];    cell.textLabel.font = [UIFont systemFontOfSize:17];    return cell;}@end

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