iOS中UIRefreshControl的基本使用详解

NS_CLASS_AVAILABLE_IOS(6_0) @interface UIRefreshControl : UIControl 
- (instancetype)init; 
@property (nonatomic, readonly, getter=isRefreshing) BOOL refreshing; 
// 菊花颜色 
@property (nonatomic, retain) UIColor *tintColor; 
// 下拉刷新文字描述 
@property (nonatomic, retain) NSAttributedString *attributedTitle UI_APPEARANCE_SELECTOR; 
// 开始刷新 
- (void)beginRefreshing NS_AVAILABLE_IOS(6_0); 
// 结束刷新 
- (void)endRefreshing NS_AVAILABLE_IOS(6_0); 
@end 

#import <UIKit/UIKit.h> 
@interface RefreshTableViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> 
@property (nonatomic, retain) UITableView * tableView; 
@property (nonatomic, retain) UIRefreshControl * refreshControl; 
@property (nonatomic, retain) NSMutableArray * dataSource; 
@end 

#import <UIKit/UIKit.h> 
@interface RefreshTableViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> 
@property (nonatomic, retain) UITableView * tableView; 
@property (nonatomic, retain) UIRefreshControl * refreshControl; 
@property (nonatomic, retain) NSMutableArray * dataSource; 
@end 
#import "RefreshTableViewController.h" 
@interface RefreshTableViewController () 
@end 
 
@implementation RefreshTableViewController 
- (void)viewDidLoad { 
 [super viewDidLoad]; 
  
 _dataSource = [NSMutableArray arrayWithObjects:@"1", @"2", @"3", @"4", nil nil]; 
  
 // UITableView 
 _tableView = [[UITableView alloc] initWithFrame:self.view.frame style:UITableViewStylePlain]; 
 _tableView.delegate = self; 
 _tableView.dataSource = self; 
 [_tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"UITableViewCell"]; 
 [self.view addSubview:_tableView]; 
  
 // UIRefreshControl 
 _refreshControl = [[UIRefreshControl alloc] init]; 
 _refreshControl.tintColor = [UIColor redColor]; 
 _refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"下拉刷新"]; 
 [_refreshControl addTarget:self action:@selector(refreshControlAction) forControlEvents:UIControlEventValueChanged]; 
 [_tableView addSubview:_refreshControl]; 
} 
 
 
- (void) refreshControlAction { 
 if (self.refreshControl.refreshing) { 
  _refreshControl.attributedTitle = [[NSAttributedString alloc] initWithString:@"加载中..."]; 
   
  // 1. 远程请求数据 
  [self requestAPIData]; 
   
  // 2. 结束刷新 
  [self.refreshControl endRefreshing]; 
   
  // 3. 重新加载数据 
  [self.tableView reloadData]; 
 } 
} 
 
 
- (void)requestAPIData { 
 // 模拟远程请求所耗费的时间 
 [NSThread sleepForTimeInterval:2]; 
 for (int i = 0; i < 5; i++) { 
  int value = (arc4random() % 100) + 1; 
  [self.dataSource addObject:[NSString stringWithFormat:@"%d", value]]; 
 } 
} 
 
 
- (NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { 
 return self.dataSource.count; 
} 
 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
 static NSString * ID = @"UITableViewCell"; 
 UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:ID]; 
 if (cell == nil) { 
  cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID]; 
 } 
  
 cell.textLabel.text = self.dataSource[indexPath.row]; 
 return cell; 
} 
 
 
- (void)didReceiveMemoryWarning { 
 [super didReceiveMemoryWarning]; 
} 
@end