share中简单聊天界面的实现<代码>

关于share中简单聊天界面的实现（韩笑）

主要是用UITableView来实现，先用要发送的消息自适应获得尺寸，在cell上加聊天内容。

#import "chatViewController.h"@interface chatViewController ()<UITextFieldDelegate,UITableViewDataSource,UITableViewDelegate>{    UIView *_textView;       //最底下的输入视图    UITextField *_textField; //输入框    NSMutableArray *_array;  //存储发过的消息    UITableView *_tableView; //消息界面}@end@implementation chatViewController- (void)viewDidLoad {    [super viewDidLoad];    _array=[[NSMutableArray alloc]initWithCapacity:0];    _tableView=[[UITableView alloc]initWithFrame:CGRectMake(0, 0, 375, 633) style:UITableViewStylePlain];    _tableView.delegate=self;    _tableView.dataSource=self;    [self.view addSubview:_tableView];    _textView=[[UIView alloc]initWithFrame:CGRectMake(0, 600, 375, 44)];    _textView.backgroundColor=[UIColor redColor];    [self.view addSubview:_textView];    _textField=[[UITextField alloc]initWithFrame:CGRectMake(10, 5, 310, 34)];    _textField.borderStyle=UITextBorderStyleRoundedRect;    _textField.delegate=self;    [_textView addSubview:_textField];    UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];    button.frame=CGRectMake(320, 5, 55, 34);    [button setTitle:@"发送" forState:UIControlStateNormal];    [button addTarget:self action:@selector(sendMessage) forControlEvents:UIControlEventTouchUpInside];    [_textView addSubview:button];}-(void)sendMessage{    NSDictionary *dictionary=@{NSFontAttributeName:[UIFont systemFontOfSize:18]};    CGSize size=[_textField.text boundingRectWithSize:CGSizeMake(305, 10000) options:NSStringDrawingTruncatesLastVisibleLine attributes:dictionary context:nil].size; //自适应尺寸    UIView *view=[[UIView alloc]initWithFrame:CGRectMake(255-size.width, 0, size.width+90, size.height+60)];    view.tag=121; //view是cell上加的视图    UIImageView *imageView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 15, size.width+40, size.height+30)];    imageView.image=[UIImage imageNamed:@"chat1"];    [view addSubview:imageView]; //气泡的图片加到view    UILabel *lable=[[UILabel alloc]initWithFrame:CGRectMake(20, 15, size.width, size.height)];    lable.text=_textField.text;    lable.font=[UIFont systemFontOfSize:18];    lable.numberOfLines=0;    [imageView addSubview:lable]; //聊天内容加到气泡上    UIImageView *headImageView=[[UIImageView alloc]initWithFrame:CGRectMake(size.width+40, 10, 60, 60)];    headImageView.image=[UIImage imageNamed:@"sixin_img1"];    [view addSubview:headImageView]; //用户头像    [_array addObject:view]; //将view加到数组中    [_tableView reloadData]; //刷新数据    [_tableView scrollToNearestSelectedRowAtScrollPosition:UITableViewScrollPositionBottom animated:YES]; //滑动viewController到最后一行    _textField.text=@""; //textField内容清空}//编辑开始时开启动画上移textView和tableView，给键盘留出空间-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField{    [UIView beginAnimations:nil context:nil];     [UIView setAnimationDuration:0.2];    _textView.frame=CGRectMake(0, 340, 375, 44);    _tableView.frame=CGRectMake(0, 0, 375, 500);    [UIView commitAnimations];    return YES;}//编辑完成时开启动画下移textView和tableView-(BOOL)textFieldShouldReturn:(UITextField *)textField{    [UIView beginAnimations:nil context:nil];    [UIView setAnimationDuration:0.2];    _textView.frame=CGRectMake(0, 623, 375, 44);    _tableView.frame=CGRectMake(0, 0, 375, 633);    [UIView commitAnimations];    [textField resignFirstResponder];    return YES;}- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{    return 1;}-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return _array.count;}-(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];        cell.selectionStyle=UITableViewCellSelectionStyleNone;    }    UIView *cellView=[cell.contentView viewWithTag:121];    [cellView removeFromSuperview];    UIView *view=[_array objectAtIndex:indexPath.row];    [cell.contentView addSubview:view]; //在cell上加聊天内容    return cell;}-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    UIView *view=[_array objectAtIndex:indexPath.row];    return view.frame.size.height; //返回cell行高}@end