import "ViewController.h"
@interface ViewController ()
{
//用盛放说话的内容
NSMutableArray *_dataArray;
//底部的视图
UIView *_bottomView;
//输入框
UITextField *_textField;
//判断是谁说
BOOL _who;
}
@property (retain, nonatomic) IBOutlet UITableView *tableView;
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_dataArray = [[NSMutableArray alloc] init];
[self createBottomView];
//separatorStyle 设置cell分割线的样式
_tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
//UIScrollViewKeyboardDismissModeOnDrag 当拖动的时候让键盘隐藏
_tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
}
#pragma mark - 创建底部的视图
- (void)createBottomView
{
//背景图，输入框，按钮 都放在一个view之上，当键盘弹出的时候，改变view的frame即可
//创建一个视图
_bottomView = [[UIView alloc] initWithFrame:CGRectMake(0, 480-44, 320, 44)];
[self.view addSubview:_bottomView];
//添加背景图
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
imgView.image = [UIImage imageNamed:@"bg"];
[_bottomView addSubview:imgView];
[imgView release];
//添加输入框
_textField = [[UITextField alloc] initWithFrame:CGRectMake(7, 7, 253, 30)];
_textField.borderStyle = UITextBorderStyleRoundedRect;
//设置输入框的代理
_textField.delegate = self;
[_bottomView addSubview:_textField];
//添加发送按钮
UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
btn.frame = CGRectMake(260, 0, 60, 44);
[btn setTitle:@"发送" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(sendMessage) forControlEvents:UIControlEventTouchUpInside];
[_bottomView addSubview:btn];
}
#pragma mark - 发送按钮点击方法
- (void)sendMessage
{
if ([_textField.text isEqualToString:@""])
{
//当内容为空的时候，不发送
return;
}
//说的内容：谁、时间、说的话都在一个视图之上，当你需要显示内容的时候，让cell addSubview
//当是YES：我，当是NO：静静
_who = !_who;
//1.获取由谁说
//如果条件为真，执行结果1；如果条件为假，执行结果2
//三目运算符 条件?结果1:结果2
NSString *name = _who?@"我":@"静静";
//2.获取说的时间
//获取当前时间
NSDate *date = [NSDate date];
//时间格式化器
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
//设置时间格式
formatter.dateFormat = @"MM-dd HH:mm:ss";
//把时间转化成字符串
NSString *time = [formatter stringFromDate:date];
//3.拼接所说的内容
NSString *message = [NSString stringWithFormat:@"%@在%@说：\n %@",name,time,_textField.text];
//4.获取盛放内容的视图
UIView *view = [self createViewWithMessage:message];
[_dataArray addObject:view];
//5.刷新表
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:_dataArray.count-1 inSection:0];
[_tableView insertRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
//当有新消息时，显示最后一行
//根据表的索引，移动到指定的位置
//atScrollPosition 要移动的位置
//UITableViewScrollPositionBottom 移动到底部
[_tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
//清空输入框的内容
_textField.text = @"";
}
//根据说的内容创建视图
- (UIView *)createViewWithMessage:(NSString *)message
{
//获取文字内容宽高
//参数1.文字的宽度200 和 高LONG_MAX
//2.NSStringDrawingUsesLineFragmentOrigin根据行高计算文字的高度
//3.attributes 文字的大小，和lab保持一致
CGRect rect = [message boundingRectWithSize:CGSizeMake(200, LONG_MAX) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:14]} context:nil];
//获取文字的高度
float height = rect.size.height;
float width = rect.size.width;
//根据谁谁判断x坐标
float x = _who?self.view.frame.size.width-width-30:0;
//1.创建view
UIView *view = [[[UIView alloc] initWithFrame:CGRectMake(x, 0, width+30, height+30)] autorelease];
view.tag = 10;
//2.添加气泡
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(5, 5, width+20, height+20)];
//根据谁说获取图片名字
NSString *imgName = _who?@"bubbleSelf":@"bubble";
UIImage *img = [UIImage imageNamed:imgName];
//stretchableImage拉伸图片
//LeftCapWidth距左边多少开始拉伸
//topCapHeight距上面多少开始拉伸
//img.size.width 获取图片的宽
imgView.image = [img stretchableImageWithLeftCapWidth:img.size.width*0.5 topCapHeight:img.size.height*0.5];
[view addSubview:imgView];
[imgView release];
//3.添加lab显示文字
UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(15, 15, width, height)];
//要比显示文字大小小一点
lab.font = [UIFont systemFontOfSize:13];
lab.numberOfLines = 0;
lab.text = message;
[view addSubview:lab];
[lab release];
return view;
}
#pragma mark - UITextFieldDelegate
//将要开始编辑的时候，键盘弹出，改变底部视图和表的位置
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
//添加动画 216
[UIView animateWithDuration:0.25 animations:^{
//让_bottomView上去
_bottomView.frame = CGRectMake(0, 480-44-216, 320, 44);
//让表上去
_tableView.frame = CGRectMake(0, 0, 320, 480-44-216);
}];
return YES;
}
//将要结束编辑，键盘下去，底部视图和表也下去
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
[UIView animateWithDuration:0.25 animations:^{
//视图下去,回到初始位置
_bottomView.frame = CGRectMake(0, 480-44, 320, 44);
//改变表的位置
_tableView.frame = CGRectMake(0, 0, 320, 480-44);
}];
return YES;
}
//点击return让键盘隐藏，失去第一响应
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
//resignFirstResponder失去第一响应
[textField resignFirstResponder];
return YES;
}
#pragma mark - 表的数据源和代理方法
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return _dataArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellID = @"cellID";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellID];
if (!cell)
{
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellID] autorelease];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
//先把添加的视图移除，防止重用
UIView *view10 = [cell viewWithTag:10];
[view10 removeFromSuperview];
//显示要说的内容
//从数组中获取要说的内容
UIView *view = [_dataArray objectAtIndex:indexPath.row];
[cell addSubview:view];
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
//根据view的高度设置单元格的高度
UIView *view = [_dataArray objectAtIndex:indexPath.row];
return view.frame.size.height;
}
- (void)dealloc {
[_dataArray release];
[_textField release];
[_bottomView release];
[_tableView release];
[super dealloc];
}
@end
附. UITextField 的代理方法
#pragma mark - UITextFieldDelegate
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
NSLog(@"将要开始编辑");
return YES;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
NSLog(@"已经开始编辑");
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
NSLog(@"将要结束编辑");
return YES;
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
NSLog(@"已经结束编辑");
}
//改变输入框内容的时候调用
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSLog(@"我要开始写啦");
return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
NSLog(@"点击了return");
//键盘弹出：成为第一响应becomeFirstResponder
//键盘隐藏：失去第一响应resignFirstResponder
//点击return键让键盘隐藏
[textField resignFirstResponder];
return YES;
}