仿QQ好友 TableView 点击展开 收缩功能实现

在IOS中，实现QQ好友一样的展开/收缩功能。使用的是UITableView控件

本文转自 http://www.999dh.net/article/iphone_ios_art/36.html 转载请注明，谢谢！

#import <UIKit/UIKit.h>

@interface CRViewController : UIViewController<UITableViewDelegate,UITableViewDataSource>
{
UITableView * tbView;
NSMutableArray * data;
}

@end

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.

data = [[NSMutableArray alloc] initWithCapacity:2];

NSMutableDictionary * dict = [[NSMutableDictionary alloc] initWithCapacity:2];
[dict setObject:@"好朋友" forKey:@"groupname"];

NSMutableArray * arr = [[NSMutableArray alloc] initWithCapacity:2];
[arr addObject:@"1111"];
[arr addObject:@"2222"];
[arr addObject:@"3333"];
[arr addObject:@"4444"];

[dict setObject:arr forKey:@"users"];
[arr release];
[data addObject:dict];
[dict release];

dict = [[NSMutableDictionary alloc] initWithCapacity:2];
[dict setObject:@"对手" forKey:@"groupname"];

arr = [[NSMutableArray alloc] initWithCapacity:2];
[arr addObject:@"5555"];
[arr addObject:@"6666"];
[arr addObject:@"7777"];
[arr addObject:@"8888"];
[dict setObject:arr forKey:@"users"];

[arr release];

[data addObject:dict];
[dict release];

CGRect frame = [UIScreen mainScreen].applicationFrame;
frame.origin.y = 0;

tbView = [[UITableView alloc] initWithFrame:frame style:UITableViewStylePlain];
[tbView setDelegate:self];
[tbView setDataSource:self];
[self.view addSubview:tbView];
[tbView release];

[tbView reloadData];

}

- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}

-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView
{
return [data count];
}

-(UITableViewCell * )tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * cellID = @"cell";

UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if( nil == cell )
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID] autorelease];
}

NSDictionary * m = (NSDictionary * )[data objectAtIndex:indexPath.section];

NSArray * d = (NSArray*)[m objectForKey:@"users"];

if( nil == d )
{
return cell;
}

cell.textLabel.text = [d objectAtIndex:indexPath.row];
cell.textLabel.backgroundColor = [UIColor clearColor];

cell.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"btn_listbg.png"]];
cell.imageView.image = [UIImage imageNamed:@"mod_user.png"];

return cell;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSDictionary * d = [data objectAtIndex:section];

//对指定节进行“展开”判断
if (![self isExpanded:section]) {

//若本节是“折叠”的，其行数返回为0
return 0;
}

return [[d objectForKey:@"users"] count];
}

-(void)collapseOrExpand:(int)section{
Boolean expanded = NO;
//Boolean searched = NO;
NSMutableDictionary* d=[data objectAtIndex:section];

//若本节model中的“expanded”属性不为空，则取出来
if([d objectForKey:@"expanded"]!=nil)
expanded=[[d objectForKey:@"expanded"]intValue];

//若原来是折叠的则展开，若原来是展开的则折叠
[d setObject:[NSNumber numberWithBool:!expanded] forKey:@"expanded"];

}

//返回指定节的“expanded”值
-(Boolean)isExpanded:(int)section{
Boolean expanded = NO;
NSMutableDictionary* d=[data objectAtIndex:section];

//若本节model中的“expanded”属性不为空，则取出来
if([d objectForKey:@"expanded"]!=nil)
expanded=[[d objectForKey:@"expanded"]intValue];

return expanded;
}

//按钮被点击时触发
-(void)expandButtonClicked:(id)sender{

UIButton* btn= (UIButton*)sender;
int section= btn.tag; //取得tag知道点击对应哪个块

// NSLog(@"click %d", section);
[self collapseOrExpand:section];

//刷新tableview
[tbView reloadData];

}

-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return 40;
}

-(UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
UIView * hView;
if( UIInterfaceOrientationLandscapeRight == [[UIDevice currentDevice] orientation] ||
UIInterfaceOrientationLandscapeLeft == [[UIDevice currentDevice] orientation])
{
hView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 480, 40)];
}
else
{
hView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 40)];
}

UIButton * eButton = [[UIButton alloc] init];

eButton.frame = hView.frame;
[eButton addTarget:self action:@selector(expandButtonClicked:) forControlEvents:UIControlEventTouchUpInside];
eButton.tag = section;

if( [self isExpanded:section])
{
[eButton setImage:[UIImage imageNamed:@"btn_down.png"] forState:UIControlStateNormal];
}
else
{
[eButton setImage:[UIImage imageNamed:@"btn_right.png"] forState:UIControlStateNormal];
}

eButton.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
[eButton setTitleEdgeInsets:UIEdgeInsetsMake(5, 10, 0, 0)];
[eButton setImageEdgeInsets:UIEdgeInsetsMake(5, 5, 0, 0)];

eButton.backgroundColor = [UIColor lightGrayColor];
[eButton setTitle:[[data objectAtIndex:section] objectForKey:@"groupname"] forState:UIControlStateNormal];
[eButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[eButton setBackgroundImage:[UIImage imageNamed:@"btn_listbg.png"] forState:UIControlStateNormal];

[hView addSubview:eButton];
[eButton release];

return hView;

}