import "ViewController.h"
@interface ViewController ()<UITableViewDataSource,UITableViewDelegate,UITextFieldDelegate>
{
//用盛放說話的內容
NSMutableArray *_dataArray;
//底部的視圖
UIView *_bottomView;
//輸入框
UITextField *_textField;
//判斷是誰說
BOOL _who;
}
@property (retain, nonatomic) IBOutlet UITableView *tableView;
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_dataArray = [[NSMutableArray alloc] init];
[self createBottomView];
//separatorStyle 設置cell分割線的樣式
_tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
//UIScrollViewKeyboardDismissModeOnDrag 當拖動的時候讓鍵盤隱藏
_tableView.keyboardDismissMode = UIScrollViewKeyboardDismissModeOnDrag;
}
#pragma mark - 創(chuàng)建底部的視圖
- (void)createBottomView
{
//背景圖，輸入框，按鈕 都放在一個view之上，當鍵盤彈出的時候，改變view的frame即可
//創(chuàng)建一個視圖
_bottomView = [[UIView alloc] initWithFrame:CGRectMake(0, 480-44, 320, 44)];
[self.view addSubview:_bottomView];
//添加背景圖
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
imgView.image = [UIImage imageNamed:@"bg"];
[_bottomView addSubview:imgView];
[imgView release];
//添加輸入框
_textField = [[UITextField alloc] initWithFrame:CGRectMake(7, 7, 253, 30)];
_textField.borderStyle = UITextBorderStyleRoundedRect;
//設置輸入框的代理
_textField.delegate = self;
[_bottomView addSubview:_textField];
//添加發(fā)送按鈕
UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];
btn.frame = CGRectMake(260, 0, 60, 44);
[btn setTitle:@"發(fā)送" forState:UIControlStateNormal];
[btn addTarget:self action:@selector(sendMessage) forControlEvents:UIControlEventTouchUpInside];
[_bottomView addSubview:btn];
}
#pragma mark - 發(fā)送按鈕點擊方法
- (void)sendMessage
{
if ([_textField.text isEqualToString:@""])
{
//當內容為空的時候，不發(fā)送
return;
}
//說的內容：誰、時間、說的話都在一個視圖之上，當你需要顯示內容的時候，讓cell addSubview
//當是YES：我，當是NO：靜靜
_who = !_who;
//1.獲取由誰說
//如果條件為真，執(zhí)行結果1；如果條件為假，執(zhí)行結果2
//三目運算符 條件?結果1:結果2
NSString *name = _who?@"我":@"靜靜";
//2.獲取說的時間
//獲取當前時間
NSDate *date = [NSDate date];
//時間格式化器
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
//設置時間格式
formatter.dateFormat = @"MM-dd HH:mm:ss";
//把時間轉化成字符串
NSString *time = [formatter stringFromDate:date];
//3.拼接所說的內容
NSString *message = [NSString stringWithFormat:@"%@在%@說：\n %@",name,time,_textField.text];
//4.獲取盛放內容的視圖
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];
//當有新消息時，顯示最后一行
//根據(jù)表的索引，移動到指定的位置
//atScrollPosition 要移動的位置
//UITableViewScrollPositionBottom 移動到底部
[_tableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
//清空輸入框的內容
_textField.text = @"";
}
//根據(jù)說的內容創(chuàng)建視圖
- (UIView *)createViewWithMessage:(NSString *)message
{
//獲取文字內容寬高
//參數(shù)1.文字的寬度200 和 高LONG_MAX
//2.NSStringDrawingUsesLineFragmentOrigin根據(jù)行高計算文字的高度
//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];
//獲取文字的高度
float height = rect.size.height;
float width = rect.size.width;
//根據(jù)誰誰判斷x坐標
float x = _who?self.view.frame.size.width-width-30:0;
//1.創(chuàng)建view
UIView *view = [[[UIView alloc] initWithFrame:CGRectMake(x, 0, width+30, height+30)] autorelease];
view.tag = 10;
//2.添加氣泡
UIImageView *imgView = [[UIImageView alloc] initWithFrame:CGRectMake(5, 5, width+20, height+20)];
//根據(jù)誰說獲取圖片名字
NSString *imgName = _who?@"bubbleSelf":@"bubble";
UIImage *img = [UIImage imageNamed:imgName];
//stretchableImage拉伸圖片
//LeftCapWidth距左邊多少開始拉伸
//topCapHeight距上面多少開始拉伸
//img.size.width 獲取圖片的寬
imgView.image = [img stretchableImageWithLeftCapWidth:img.size.width*0.5 topCapHeight:img.size.height*0.5];
[view addSubview:imgView];
[imgView release];
//3.添加lab顯示文字
UILabel *lab = [[UILabel alloc] initWithFrame:CGRectMake(15, 15, width, height)];
//要比顯示文字大小小一點
lab.font = [UIFont systemFontOfSize:13];
lab.numberOfLines = 0;
lab.text = message;
[view addSubview:lab];
[lab release];
return view;
}
#pragma mark - UITextFieldDelegate
//將要開始編輯的時候，鍵盤彈出，改變底部視圖和表的位置
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
//添加動畫 216
[UIView animateWithDuration:0.25 animations:^{
//讓_bottomView上去
_bottomView.frame = CGRectMake(0, 480-44-216, 320, 44);
//讓表上去
_tableView.frame = CGRectMake(0, 0, 320, 480-44-216);
}];
return YES;
}
//將要結束編輯，鍵盤下去，底部視圖和表也下去
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
[UIView animateWithDuration:0.25 animations:^{
//視圖下去,回到初始位置
_bottomView.frame = CGRectMake(0, 480-44, 320, 44);
//改變表的位置
_tableView.frame = CGRectMake(0, 0, 320, 480-44);
}];
return YES;
}
//點擊return讓鍵盤隱藏，失去第一響應
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
//resignFirstResponder失去第一響應
[textField resignFirstResponder];
return YES;
}
#pragma mark - 表的數(shù)據(jù)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;
}
//先把添加的視圖移除，防止重用
UIView *view10 = [cell viewWithTag:10];
[view10 removeFromSuperview];
//顯示要說的內容
//從數(shù)組中獲取要說的內容
UIView *view = [_dataArray objectAtIndex:indexPath.row];
[cell addSubview:view];
return cell;
}
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
//根據(jù)view的高度設置單元格的高度
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(@"將要開始編輯");
return YES;
}
- (void)textFieldDidBeginEditing:(UITextField *)textField
{
NSLog(@"已經(jīng)開始編輯");
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
NSLog(@"將要結束編輯");
return YES;
}
- (void)textFieldDidEndEditing:(UITextField *)textField
{
NSLog(@"已經(jīng)結束編輯");
}
//改變輸入框內容的時候調用
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
NSLog(@"我要開始寫啦");
return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
NSLog(@"點擊了return");
//鍵盤彈出：成為第一響應becomeFirstResponder
//鍵盤隱藏：失去第一響應resignFirstResponder
//點擊return鍵讓鍵盤隱藏
[textField resignFirstResponder];
return YES;
}