气泡聊天

#import "ViewController.h"

#import "ChatCell.h"

#import "ChatItem.h"

@interface
ViewController ()<UITableViewDataSource,UITableViewDelegate,
UITextFieldDelegate>{

NSMutableArray* _dataArray;

UITableView* _tableView;

UIView* _chatView;

UITextField* _textField;
}

@end

@implementation ViewController

//隐藏状态栏
- (BOOL)prefersStatusBarHidden{

return
YES;
}

- (void)viewDidLoad {

[super
viewDidLoad];

_dataArray = [[NSMutableArray
alloc] init];

_tableView = [[UITableView
alloc]
initWithFrame:CGRectMake(0,
0, self.view.frame.size.width,
self.view.frame.size.height -
40)];

_tableView.delegate =
self;

_tableView.dataSource =
self;

//分割线

_tableView.separatorStyle =
UITableViewCellSeparatorStyleNone;
[self.view
addSubview:_tableView];

_chatView = [[UIView
alloc]
initWithFrame:CGRectMake(0,
self.view.frame.size.height-40,
self.view.frame.size.width,
40)];

_chatView.backgroundColor = [UIColor
grayColor];
[self.view
addSubview:_chatView];

_textField = [[UITextField
alloc] initWithFrame:CGRectMake(10,
5, self.view.frame.size.width -
70, 30)];

_textField.delegate =
self;

_textField.borderStyle =
UITextBorderStyleRoundedRect;

[_chatView
addSubview:_textField];

UIButton* button = [UIButton
buttonWithType:UIButtonTypeRoundedRect];
button.frame =
CGRectMake(self.view.frame.size.width -
60, 5,
50, 30);

[button setTitle:@"发送"
forState:UIControlStateNormal];

[button addTarget:self
action:@selector(sendText)
forControlEvents:UIControlEventTouchUpInside];
[_chatView
addSubview:button];

//监听键盘出现

[[NSNotificationCenter
defaultCenter] addObserver:self
selector:@selector(keyboardWillShow:)
name:UIKeyboardWillShowNotification
object:nil];

//监听键盘消失

[[NSNotificationCenter
defaultCenter] addObserver:self
selector:@selector(keyboardWillHide:)
name:UIKeyboardWillHideNotification
object:nil];
}

//键盘出现
- (void)keyboardWillShow:(NSNotification*)noti{

//键盘Size

CGSize size = [noti.userInfo[UIKeyboardFrameEndUserInfoKey]
CGRectValue].size;

_tableView.frame =
CGRectMake(0,
0, self.view.frame.size.width,
self.view.frame.size.height -
40 - size.height);

_chatView.frame =
CGRectMake(0,
self.view.frame.size.height -
40 - size.height,
self.view.frame.size.width,
40);
}

//收键盘
- (BOOL)textFieldShouldReturn:(UITextField *)textField{

[textField resignFirstResponder];

return
YES;
}

//键盘将要消失
- (void)keyboardWillHide:(NSNotification*)noti{

_tableView.frame =
CGRectMake(0,
0, self.view.frame.size.width,
self.view.frame.size.height -
40);

_chatView.frame =
CGRectMake(0,
self.view.frame.size.height -
40,
self.view.frame.size.width,
40);
}

- (void)sendText{

ChatItem* item = [[ChatItem
alloc] init];
item.isSelf =
YES;

item.content =
_textField.text;

_textField.text =
@"";
[_dataArray
addObject:item];

//刷新

NSIndexPath* indexPath = [NSIndexPath
indexPathForRow:_dataArray.count-1
inSection:0];

[_tableView
insertRowsAtIndexPaths:@[indexPath]
withRowAnimation:UITableViewRowAnimationFade];

//向上滚动

[_tableView
scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom
animated:YES];

[NSTimer
scheduledTimerWithTimeInterval:1.0
target:self
selector:@selector(autoSpeak)
userInfo:nil
repeats:NO];
}

//自动回复
- (void)autoSpeak{

//http://lqcjdx.blog.163.com/blog/static/20748924120138344325384/

NSArray* array =
@[@"好的",
@"没门",
@"你想多了",
@"我去",
@"去死",
@"一边去",
@"没问题",
@"妥妥的"];

ChatItem* item = [[ChatItem
alloc] init];
item.isSelf =
NO;
item.content = array[arc4random()%array.count];
[_dataArray
addObject:item];

//刷新

NSIndexPath* indexPath = [NSIndexPath
indexPathForRow:_dataArray.count-1
inSection:0];

[_tableView
insertRowsAtIndexPaths:@[indexPath]
withRowAnimation:UITableViewRowAnimationFade];

//向上滚动

[_tableView
scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom
animated:YES];
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

return
_dataArray.count;
}

- (UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath
*)indexPath{

ChatCell* cell = [tableView
dequeueReusableCellWithIdentifier:@"ID"];

if (cell == nil) {

cell = [[ChatCell
alloc] initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:@"ID"];

//选中

cell.selectionStyle =
UITableViewCellSelectionStyleNone;
}

ChatItem* item = _dataArray[indexPath.row];

//限制文本最大宽高

CGSize size = [item.content
boundingRectWithSize:CGSizeMake(250,
1000)
options:NSStringDrawingTruncatesLastVisibleLine |
NSStringDrawingUsesLineFragmentOrigin |
NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont
systemFontOfSize:15.0]}
context:nil].size;

if (item.isSelf) {

//我们自己发的
cell.leftView.hidden =
YES;
cell.rightView.hidden =
NO;

//显示内容
cell.rightLabel.text = item.content;

//显示大小
cell.rightLabel.frame =
CGRectMake(10,
5, size.width, size.height);
cell.rightView.frame =
CGRectMake([[UIScreen
mainScreen] bounds].size.width - size.width -
30, 5, size.width +
25, size.height +
20);
}
else {

//接收到的
cell.leftView.hidden =
NO;
cell.rightView.hidden =
YES;
cell.leftLabel.text = item.content;
cell.leftLabel.frame =
CGRectMake(15,
5, size.width, size.height);
cell.leftView.frame =
CGRectMake(5,
5, size.width +
25, size.height +
20);
}

return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath
*)indexPath{

ChatItem* item = _dataArray[indexPath.row];

//限制文本最大宽高

CGSize size = [item.content
boundingRectWithSize:CGSizeMake(250,
1000)
options:NSStringDrawingTruncatesLastVisibleLine |
NSStringDrawingUsesLineFragmentOrigin |
NSStringDrawingUsesFontLeading attributes:@{NSFontAttributeName:[UIFont
systemFontOfSize:15.0]}
context:nil].size;

return size.height +
20 + 10;
}

@end

//ChatItem

#import <Foundation/Foundation.h>

@interface ChatItem :
NSObject

@property (nonatomic)
BOOL isSelf;

@property (nonatomic,
copy) NSString* content;

@end

//ChatCell

#import <UIKit/UIKit.h>

@interface ChatCell :
UITableViewCell

@property (nonatomic,
strong) UIImageView* leftView;

@property (nonatomic,
strong) UIImageView* rightView;

@property (nonatomic,
strong) UILabel* leftLabel;

@property (nonatomic,
strong) UILabel* rightLabel;

@end

#import "ChatCell.h"

@implementation ChatCell

- (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString
*)reuseIdentifier{

if (self = [super
initWithStyle:style
reuseIdentifier:reuseIdentifier]) {
[self
makeView];
}

return
self;
}

- (void)makeView{

//气泡图片

UIImage* leftBubble = [UIImage
imageNamed:@"ReceiverTextNodeBkg.png"];

UIImage* rightBubble = [UIImage
imageNamed:@"SenderTextNodeBkg.png"];

//设定一行一列像素进行复制

leftBubble = [leftBubble stretchableImageWithLeftCapWidth:30
topCapHeight:35];

rightBubble = [rightBubble stretchableImageWithLeftCapWidth:30
topCapHeight:35];

//左气泡

self.leftView = [[UIImageView
alloc] initWithFrame:CGRectMake(5,
5, 20,
20)];

_leftView.image = leftBubble;

[self.contentView
addSubview:_leftView];

//右气泡

self.rightView = [[UIImageView
alloc] initWithFrame:CGRectMake([[UIScreen
mainScreen] bounds].size.width -
25,
5, 20,
20)];

_rightView.image = rightBubble;

[self.contentView
addSubview:_rightView];

//左label

self.leftLabel = [[UILabel
alloc] initWithFrame:CGRectMake(15,
5, 5,
5)];

_leftLabel.font = [UIFont
systemFontOfSize:15.0];

_leftLabel.numberOfLines =
0;

[_leftView
addSubview:_leftLabel];

//右label

self.rightLabel = [[UILabel
alloc] initWithFrame:CGRectMake(10,
5, 5,
5)];

_rightLabel.font = [UIFont
systemFontOfSize:15.0];

_rightLabel.numberOfLines =
0;

[_rightView
addSubview:_rightLabel];
}

@end