iOS 下拉刷新和加载更多 (OC\Swift)
Swift语言出来之后, 可能还没有第三方的下拉刷新和上提加载, 所以自己用UIRefreshControl控件和UITableView实例的tableFooterView(底部视图)属性结合起来写了一个下拉刷新和点击加载更多的基本实现, 分为OC的代码实现和Swift的代码实现, 希望大家可以指出不足:
Swift代码:
1 import UIKit
2
3 class ViewController: UITableViewController {
4
5 // 用于显示的数据源
6 var _dataSource:[String] = []
7
8 // 加载更多 状态 风火轮
9 var _aiv:UIActivityIndicatorView!
10
11 override func viewDidLoad() {
12 super.viewDidLoad()
13 // Do any additional setup after loading the view, typically from a nib.
14
15 // 数据源中的基础数据
16 for i in 0...2 {
17
18 _dataSource.append("\(i)")
19 }
20
21 // 初始下拉刷新控件
22 self.refreshControl = UIRefreshControl()
23 self.refreshControl?.attributedTitle = NSAttributedString(string: "Pull To Refresh")
24 self.refreshControl?.tintColor = UIColor.greenColor()
25 self.refreshControl?.addTarget(self, action: "refresh", forControlEvents: .ValueChanged)
26
27 // 加载更多按扭的背景视图
28 var tableFooterView:UIView = UIView()
29 tableFooterView.frame = CGRectMake(0, 0, self.view.bounds.size.width, 44)
30 tableFooterView.backgroundColor = UIColor.greenColor()
31 self.tableView.tableFooterView = tableFooterView
32
33 // 加载更多的按扭
34 let loadMoreBtn = UIButton()
35 loadMoreBtn.frame = CGRectMake(0, 0, self.view.bounds.width, 44)
36 loadMoreBtn.setTitle("Load More", forState: .Normal)
37 loadMoreBtn.setTitleColor(UIColor.lightGrayColor(), forState: .Normal)
38 loadMoreBtn.addTarget(self, action: "loadMore:", forControlEvents: .TouchUpInside)
39 tableFooterView.addSubview(loadMoreBtn)
40
41 // 加载更多 状态 风火轮
42 _aiv = UIActivityIndicatorView(activityIndicatorStyle: .Gray)
43 _aiv.center = loadMoreBtn.center
44 tableFooterView.addSubview(_aiv)
45 }
46
47 // 加载更多方法
48 func loadMore(sender:UIButton) {
49
50 sender.hidden = true
51 _aiv.startAnimating()
52
53 dispatch_async(dispatch_get_global_queue(0, 0), { () -> Void in
54
55 self._dataSource.append("\(self._dataSource[self._dataSource.count-1].toInt()! + 1)")
56
57 dispatch_async(dispatch_get_main_queue(), { () -> Void in
58
59 sleep(1)
60
61 self._aiv.stopAnimating()
62 sender.hidden = false
63
64 self.tableView.reloadData()
65 })
66 })
67 }
68
69 // 下拉刷新方法
70 func refresh() {
71
72 if self.refreshControl?.refreshing == true {
73
74 self.refreshControl?.attributedTitle = NSAttributedString(string: "Loading...")
75 }
76
77 dispatch_async(dispatch_get_global_queue(0, 0), { () -> Void in
78
79 self._dataSource.insert("\(self._dataSource[0].toInt()! - 1)", atIndex: 0)
80
81 dispatch_async(dispatch_get_main_queue(), { () -> Void in
82
83 sleep(1)
84
85 self.refreshControl?.endRefreshing()
86 self.refreshControl?.attributedTitle = NSAttributedString(string: "Pull To Refresh")
87
88 self.tableView.reloadData()
89 })
90 })
91 }
92
93 // tableView dataSource
94 override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
95
96 return _dataSource.count
97 }
98
99 override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
100
101 let identifier = "cell"
102
103 var cell = tableView .dequeueReusableCellWithIdentifier(identifier) as? UITableViewCell
104
105 if cell == nil {
106
107 cell = UITableViewCell(style: .Default, reuseIdentifier: identifier)
108 }
109
110 cell?.textLabel?.text = "\(_dataSource[indexPath.row])"
111
112 return cell!
113 }
114 }
OC代码:
1 #import "ViewController.h"
2
3 @interface ViewController ()
4 {
5 // 数据源
6 NSMutableArray * _dataSource;
7
8 // 风火轮
9 UIActivityIndicatorView * _aiv;
10 }
11
12 @end
13
14 @implementation ViewController
15
16 - (instancetype)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
17 {
18 return self;
19 }
20
21 - (void)viewDidLoad {
22 [super viewDidLoad];
23 // Do any additional setup after loading the view, typically from a nib.
24
25 // 初始数据源
26 _dataSource = [[NSMutableArray alloc] init];
27
28 // 基础数据
29 for (int i=0; i<3; i++) {
30
31 [_dataSource addObject:[NSString stringWithFormat:@"%d",i]];
32 }
33
34 // 刷新控件
35 self.refreshControl = [[UIRefreshControl alloc] init];
36 self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"Pull To Refresh"];
37 self.refreshControl.tintColor = [UIColor greenColor];
38 [self.refreshControl addTarget:self action:@selector(refresh) forControlEvents:UIControlEventValueChanged];
39
40 // 背景视图
41 UIView * tableFooterView = [[UIView alloc] init];
42 tableFooterView.frame = CGRectMake(0, 0, self.view.bounds.size.width, 44);
43 tableFooterView.backgroundColor = [UIColor greenColor];
44 self.tableView.tableFooterView = tableFooterView;
45
46 // 加载更多按扭
47 UIButton * loadMoreBtn = [[UIButton alloc] init];
48 loadMoreBtn.frame = CGRectMake(0, 0, self.view.bounds.size.width, 44);
49 [loadMoreBtn setTitle:@"Load More" forState:UIControlStateNormal];
50 [loadMoreBtn setTitleColor:[UIColor lightGrayColor] forState:UIControlStateNormal];
51 [loadMoreBtn addTarget:self action:@selector(loadMore:) forControlEvents:UIControlEventTouchUpInside];
52 [tableFooterView addSubview:loadMoreBtn];
53
54 // 风火轮
55 _aiv = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
56 _aiv.center = loadMoreBtn.center;
57 [tableFooterView addSubview:_aiv];
58 }
59
60 // 加载更多方法
61 - (void)loadMore:(UIButton *)sender
62 {
63 sender.hidden = YES;
64 [_aiv startAnimating];
65
66 dispatch_async(dispatch_get_global_queue(0, 0), ^{
67
68 [_dataSource addObject: [NSString stringWithFormat:@"%d", [_dataSource[_dataSource.count-1] intValue] + 1]];
69
70 dispatch_async(dispatch_get_main_queue(), ^{
71
72 sleep(1);
73
74 [_aiv stopAnimating];
75 sender.hidden = NO;
76
77 [self.tableView reloadData];
78 });
79 });
80 }
81
82 // 下拉刷新方法
83 - (void)refresh {
84
85 if (self.refreshControl.refreshing) {
86
87 self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"Loading..."];
88 }
89
90 dispatch_async(dispatch_get_global_queue(0, 0), ^{
91
92 [_dataSource insertObject:[NSString stringWithFormat:@"%d", [_dataSource[0] intValue] -1] atIndex:0];
93
94 dispatch_async(dispatch_get_main_queue(), ^{
95
96 sleep(1);
97
98 [self.refreshControl endRefreshing];
99 self.refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"Pull To Refresh"];
100
101 [self.tableView reloadData];
102 });
103 });
104 }
105
106 // tableView dataSource
107 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
108
109 return _dataSource.count;
110 }
111
112 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
113
114 static NSString * identifier = @"cell";
115
116 UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:identifier];
117
118 if (cell == nil) {
119 cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
120 }
121
122 cell.textLabel.text = _dataSource[indexPath.row];
123
124 return cell;
125 }
126
127 @end
