iOS实现MJRefresh下拉刷新（上拉加载）使用详解

#pragma mark UITableView + 下拉刷新 默认

- (void)example01

{

  __weak __typeof(self) weakSelf = self; 

  // 设置回调（一旦进入刷新状态就会调用这个refreshingBlock）

  self.tableView.mj_header = [MJRefreshNormalHeader headerWithRefreshingBlock:^{

    [weakSelf loadNewData];

  }];

  // 马上进入刷新状态

  [self.tableView.mj_header beginRefreshing];

} 

#pragma mark UITableView + 下拉刷新 动画图片

- (void)example02

{

  // 设置回调（一旦进入刷新状态，就调用target的action，也就是调用self的loadNewData方法）

  self.tableView.mj_header = [MJChiBaoZiHeader headerWithRefreshingTarget:self refreshingAction:@selector(loadNewData)];

   

  // 马上进入刷新状态

  [self.tableView.mj_header beginRefreshing];

} 

#import "MJRefreshGifHeader.h" 

@interface MJChiBaoZiHeader : MJRefreshGifHeader 

@end

- (void)prepare

{

  [super prepare];   

  // 设置普通状态的动画图片

  NSMutableArray *idleImages = [NSMutableArray array];

  for (NSUInteger i = 1; i<=60; i++) {

    UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"dropdown_anim__000%zd", i]];

    [idleImages addObject:image];

  }

   [self setImages:idleImages forState:MJRefreshStateIdle];   

  // 设置即将刷新状态的动画图片（一松开就会刷新的状态）

  NSMutableArray *refreshingImages = [NSMutableArray array];

  for (NSUInteger i = 1; i<=3; i++) {

    UIImage *image = [UIImage imageNamed:[NSString stringWithFormat:@"dropdown_loading_0%zd", i]];

    [refreshingImages addObject:image];

  }

  [self setImages:refreshingImages forState:MJRefreshStatePulling];  

  // 设置正在刷新状态的动画图片

  [self setImages:refreshingImages forState:MJRefreshStateRefreshing];

} 

/** 刷新控件的状态 */

typedef NS_ENUM(NSInteger, MJRefreshState) {

  /** 普通闲置状态 */

  MJRefreshStateIdle = 1,

  /** 松开就可以进行刷新的状态 */

  MJRefreshStatePulling,

  /** 正在刷新中的状态 */

  MJRefreshStateRefreshing,

  /** 即将刷新的状态 */

  MJRefreshStateWillRefresh,

  /** 所有数据加载完毕，没有更多的数据了 */

  MJRefreshStateNoMoreData

}; 

#pragma mark UITableView + 下拉刷新 隐藏时间

- (void)example03

{

  // 设置回调（一旦进入刷新状态，就调用target的action，也就是调用self的loadNewData方法）

  MJRefreshNormalHeader *header = [MJRefreshNormalHeader headerWithRefreshingTarget:self refreshingAction:@selector(loadNewData)];

   

  // 设置自动切换透明度(在导航栏下面自动隐藏)

  header.automaticallyChangeAlpha = YES;

  // 隐藏时间

  header.lastUpdatedTimeLabel.hidden = YES;
  // 马上进入刷新状态

  [header beginRefreshing];
  // 设置header

  self.tableView.mj_header = header;

} 

#pragma mark UITableView + 下拉刷新 隐藏状态和时间

- (void)example04

{

  // 设置回调（一旦进入刷新状态，就调用target的action，也就是调用self的loadNewData方法）

  MJChiBaoZiHeader *header = [MJChiBaoZiHeader headerWithRefreshingTarget:self refreshingAction:@selector(loadNewData)];

   

  // 隐藏时间

  header.lastUpdatedTimeLabel.hidden = YES;

 

  // 隐藏状态

  header.stateLabel.hidden = YES;

   

  // 马上进入刷新状态

  [header beginRefreshing];

   

  // 设置header

  self.tableView.mj_header = header;

} 

#pragma mark UITableView + 下拉刷新 自定义文字

- (void)example05

{

  // 设置回调（一旦进入刷新状态，就调用target的action，也就是调用self的loadNewData方法）

  MJRefreshNormalHeader *header = [MJRefreshNormalHeader headerWithRefreshingTarget:self refreshingAction:@selector(loadNewData)];

   

  // 设置文字

  [header setTitle:@"快扯我，快点" forState:MJRefreshStateIdle];

  [header setTitle:@"数据要来啦" forState:MJRefreshStatePulling];

  [header setTitle:@"服务器正在狂奔 ..." forState:MJRefreshStateRefreshing];

   

  // 设置字体

  header.stateLabel.font = [UIFont systemFontOfSize:15];

  header.lastUpdatedTimeLabel.font = [UIFont systemFontOfSize:14];

 

  // 设置颜色

  header.stateLabel.textColor = [UIColor redColor];

  header.lastUpdatedTimeLabel.textColor = [UIColor grayColor];

   

  // 马上进入刷新状态

  [header beginRefreshing];

   

  // 设置刷新控件

  self.tableView.mj_header = header;

} 

@interface MJDIYHeader()

@property (weak, nonatomic) UILabel *label;

@property (weak, nonatomic) UISwitch *s;

@property (weak, nonatomic) UIImageView *logo;

@property (weak, nonatomic) UIActivityIndicatorView *loading;

@end 

#pragma mark 在这里做一些初始化配置（比如添加子控件）

- (void)prepare

{

  [super prepare];  

  // 设置控件的高度

  self.mj_h = 50;

   

  // 添加label

  UILabel *label = [[UILabel alloc] init];

  label.textColor = [UIColor colorWithRed:1.0 green:0.5 blue:0.0 alpha:1.0];

  label.font = [UIFont boldSystemFontOfSize:16];

  label.textAlignment = NSTextAlignmentCenter;

  [self addSubview:label];

  self.label = label;

   

  // 打酱油的开关

  UISwitch *s = [[UISwitch alloc] init];

  [self addSubview:s];

  self.s = s;

   

  // logo

  UIImageView *logo = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"Logo"]];

  logo.contentMode = UIViewContentModeScaleAspectFit;

  [self addSubview:logo];

  self.logo = logo;

   

  // loading

  UIActivityIndicatorView *loading = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];

  [self addSubview:loading];

  self.loading = loading;

} 

#pragma mark 在这里设置子控件的位置和尺寸

- (void)placeSubviews

{

  [super placeSubviews];

 

  self.label.frame = self.bounds;

   

  self.logo.bounds = CGRectMake(0, 0, self.bounds.size.width, 100);

  self.logo.center = CGPointMake(self.mj_w * 0.5, - self.logo.mj_h + 20);

   

  self.loading.center = CGPointMake(self.mj_w - 30, self.mj_h * 0.5);

} 

#pragma mark 监听控件的刷新状态

- (void)setState:(MJRefreshState)state

{

  MJRefreshCheckState;

 

  switch (state) {

    case MJRefreshStateIdle:

      [self.loading stopAnimating];

      [self.s setOn:NO animated:YES];

      self.label.text = @"赶紧下拉吖(开关是打酱油滴)";

      break;

    case MJRefreshStatePulling:

      [self.loading stopAnimating];

      [self.s setOn:YES animated:YES];

      self.label.text = @"赶紧放开我吧(开关是打酱油滴)";

      break;

    case MJRefreshStateRefreshing:

      [self.s setOn:YES animated:YES];

      self.label.text = @"加载数据中(开关是打酱油滴)";

      [self.loading startAnimating];

      break;

    default:

      break;

  }

}