[iOS基础控件 - 6.9] 聊天界面Demo

 1 @implementation NSString (Extension)
 2 
 3 /** 测量文本的尺寸 */
 4 - (CGSize)sizeWithFont:(UIFont *)font maxSize:(CGSize)maxSize {
 5     NSDictionary *attrs = @{NSFontAttributeName: font};
 6     CGSize size =  [self boundingRectWithSize:maxSize options:NSStringDrawingUsesLineFragmentOrigin attributes:attrs context:nil].size;
 7    
 8     return size;
 9 }
10 
11 @end

 1     // 3.信息，尺寸可变
 2     CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;
 3     // 3.1 设置最大尺寸
 4     CGSize textMaxSize = CGSizeMake(screenWidth - iconWidth - padding * 5, MAXFLOAT);
 5     // 3.2 计算真实尺寸
 6     CGSize textRealSize = [message.text sizeWithFont:MESSAGE_TEXT_FONT maxSize:textMaxSize];
 7 
 8     // 3.3 调整信息的位置
 9     CGFloat textX;
10     if (MessageTypeMe == message.type) {
11         // 我方，放在靠右
12         textX = CGRectGetMinX(_iconFrame) - textRealSize.width - padding;
13     } else {
14         // 对方，放在靠左
15         textX = CGRectGetMaxX(_iconFrame) + padding;
16     }
17    
18     CGFloat textY = iconY;
19     _textFrame = CGRectMake(textX, textY, textRealSize.width, textRealSize.height);

 1     // 2.头像
 2     CGFloat iconWidth = 40;
 3     CGFloat iconHeight = 40;
 4    
 5     // 2.1 根据信息的发送方调整头像位置
 6     CGFloat iconX;
 7     if (MessageTypeMe == message.type) {
 8         // 我方，放在右边
 9         iconX = [UIScreen mainScreen].bounds.size.width - padding - iconWidth;
10     } else {
11         // 对方，放在左边
12         iconX = padding;
13     }
14    
15     CGFloat iconY = CGRectGetMaxY(_timeFrame) + padding;
16     _iconFrame = CGRectMake(iconX, iconY, iconWidth, iconHeight);

 1 @implementation UIImage (Extension)
 2 
 3 + (UIImage *) resizableImage:(NSString *) imageName {
 4     UIImage *image = [UIImage imageNamed:imageName];
 5     // 取图片中部的1 x 1进行拉伸
 6     UIEdgeInsets insets = UIEdgeInsetsMake(image.size.height/2, image.size.width/2, image.size.height/2 + 1, image.size.width/2 + 1);
 7     return [image resizableImageWithCapInsets:insets];
 8 }
 9 
10 @end

 1     // 3.1 设置聊天框
 2     NSString *chatImageNormalName;
 3     NSString *chatImageHighlightedName;
 4     if (MessageTypeMe == messageFrame.message.type) {
 5         chatImageNormalName = @"chat_send_nor";
 6         chatImageHighlightedName = @"chat_send_press_pic";
 7     } else {
 8         chatImageNormalName = @"chat_receive_nor";
 9         chatImageHighlightedName = @"chat_receive_press_pic";
10     }
11    
12     UIImage *chatImageNormal = [UIImage resizableImage:chatImageNormalName];
13     UIImage *chatImageHighlighted = [UIImage resizableImage:chatImageHighlightedName];
14     [self.textView setBackgroundImage:chatImageNormal forState:UIControlStateNormal];
15     [self.textView setBackgroundImage:chatImageHighlighted forState:UIControlStateHighlighted];

1     // 3.2 调整文字的内边距
2     textView.contentEdgeInsets = UIEdgeInsetsMake(TEXT_INSET, TEXT_INSET, TEXT_INSET, TEXT_INSET);

 1     // 3.信息，尺寸可变
 2     CGFloat screenWidth = [UIScreen mainScreen].bounds.size.width;
 3     // 3.1 设置文本最大尺寸
 4     CGSize textMaxSize = CGSizeMake(screenWidth - iconWidth - padding * 10, MAXFLOAT);
 5     // 3.2 计算文本真实尺寸
 6     CGSize textRealSize = [message.text sizeWithFont:MESSAGE_TEXT_FONT maxSize:textMaxSize];
 7    
 8     // 3.3 按钮尺寸
 9     CGSize btnSize = CGSizeMake(textRealSize.width + TEXT_INSET*2, textRealSize.height + TEXT_INSET*2);
10 
11     // 3.4 调整信息的位置
12     CGFloat textX;
13     if (MessageTypeMe == message.type) {
14         // 我方，放在靠右
15         textX = CGRectGetMinX(_iconFrame) - btnSize.width - padding;
16     } else {
17         // 对方，放在靠左
18         textX = CGRectGetMaxX(_iconFrame) + padding;
19     }
20    
21     CGFloat textY = iconY;
22     _textFrame = CGRectMake(textX, textY, btnSize.width, btnSize.height);

1 /** 是否隐藏发送时间 */
2 @property(nonatomic, assign) BOOL hideTime;

1 // 判断是否发送时间与上一条信息的发送时间相同，若是则不用显示了
2 MessageFrame *lastMessageFrame = [mdictArray lastObject];
3 if (lastMessageFrame && [message.time isEqualToString:lastMessageFrame.message.time]) {
4      message.hideTime = YES;
5 }

1     // 1.发送时间
2     if (NO == message.hideTime) {
3         CGFloat timeWidth = [UIScreen mainScreen].bounds.size.width;
4         CGFloat timeHeight = 40;
5         CGFloat timeX = 0;
6         CGFloat timeY = 0;
7         _timeFrame = CGRectMake(timeX, timeY, timeWidth, timeHeight);
8     }

1     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];

 1 /** 点击拖曳聊天区的时候，缩回键盘 */
 2 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
 3     // 1.缩回键盘
 4     [self.view endEditing:YES];
 5 }
 6 
 7 
 8 #pragma mark - 监听事件
 9 - (void) keyboardWillChangeFrame:(NSNotification *) note {
10     // 1.取得弹出后的键盘frame
11     CGRect keyboardFrame = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
12    
13     // 2.键盘弹出的耗时时间
14     CGFloat duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] floatValue];
15    
16     // 3.键盘变化时，view的位移，包括了上移/恢复下移
17     CGFloat transformY = keyboardFrame.origin.y - self.view.frame.size.height;
18    
19     [UIView animateWithDuration:duration animations:^{
20         self.view.transform = CGAffineTransformMakeTranslation(0, transformY);
21     }];
22    
23   
24 }

1     // 设置信息输入框的代理
2     self.inputView.delegate = self;

 1 #pragma mark - TextField 代理方法
 2 /** 回车响应事件 */
 3 - (BOOL)textFieldShouldReturn:(UITextField *)textField {
 4     // 我方发出信息
 5     [self sendMessageWithContent:textField.text andType:MessageTypeMe];
 6    
 7     // 自动回复
 8     [self sendMessageWithContent:[NSString stringWithFormat:@"%@\n%@", textField.text, @"你妹!!!"] andType:MessageTypeOhter];
 9    
10     // 消除消息框内容
11     self.inputView.text = nil;
12    
13     [self.tableView reloadData];
14    
15     // 滚动到最新的消息
16     NSIndexPath *lastIndexPath = [NSIndexPath indexPathForRow:self.messages.count - 1 inSection:0];
17     [self.tableView scrollToRowAtIndexPath:lastIndexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
18    
19     return YES; // 返回值意义不明
20 }
21 
22 // 发送消息
23 - (void) sendMessageWithContent:(NSString *) text andType:(MessageType) type {
24     // 获取当前时间
25     NSDate *date = [NSDate date];
26     NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
27     formatter.dateFormat = @"yyyy-MMM-dd hh:mm:ss";
28     NSString *dateStr = [formatter stringFromDate:date];
29    
30     // 我方发出信息
31     NSDictionary *dict = @{@"text":text,
32                            @"time":dateStr,
33                            @"type":[NSString stringWithFormat:@"%d", type]};
34    
35     Message *message = [[Message alloc] init];
36     [message setValuesForKeysWithDictionary:dict];
37     MessageFrame *messageFrame = [[MessageFrame alloc] init];
38     messageFrame.message = message;
39    
40     [self.messages addObject:messageFrame];
41 }
42  

1     // 滚动到最新的消息
2     NSIndexPath *lastIndexPath = [NSIndexPath indexPathForRow:self.messages.count - 1 inSection:0];
3     [self.tableView scrollToRowAtIndexPath:lastIndexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];