////  XMGChatingViewController.h//  07-聊天布局#import <UIKit/UIKit.h>@interface XMGChatingViewController : UIViewController@end

////  XMGChatingViewController.m//  07-聊天布局#import "XMGChatingViewController.h"#import "XMGMessage.h"#import "XMGMessageCell.h"@interface XMGChatingViewController () <UITableViewDataSource, UITableViewDelegate>@property (nonatomic, strong) NSArray *messages;@property (weak, nonatomic) IBOutlet UITextField *messageField;@property (weak, nonatomic) IBOutlet NSLayoutConstraint *bottomSpacing;@end@implementation XMGChatingViewController- (NSArray *)messages{    if (_messages == nil) {        // 加载plist中的字典数组        NSString *path = [[NSBundle mainBundle] pathForResource:@"messages.plist" ofType:nil];        NSArray *dictArray = [NSArray arrayWithContentsOfFile:path];                // 字典数组 -> 模型数组        NSMutableArray *messageArray = [NSMutableArray array];        // 用来记录上一条消息模型        XMGMessage *lastMessage = nil;        for (NSDictionary *dict in dictArray) {            XMGMessage *message = [XMGMessage messageWithDict:dict];            message.hideTime = [message.time isEqualToString:lastMessage.time];            [messageArray addObject:message];                        lastMessage = message;        }                _messages = messageArray;    }    return _messages;}- (void)viewDidLoad {    [super viewDidLoad];        // 设置文本框左边的内容    UIView *leftView = [[UIView alloc] init];    leftView.frame = CGRectMake(0, 0, 10, 0);    self.messageField.leftView = leftView;    self.messageField.leftViewMode = UITextFieldViewModeAlways;        // 监听键盘通知    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrame:) name:UIKeyboardWillChangeFrameNotification object:nil];}- (void)dealloc{    [[NSNotificationCenter defaultCenter] removeObserver:self];}#pragma mark - 键盘处理- (void)keyboardWillChangeFrame:(NSNotification *)note {    // 取出键盘最终的frame    CGRect rect = [note.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];    // 取出键盘弹出需要花费的时间    double duration = [note.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];        // 修改约束    self.bottomSpacing.constant = [UIScreen mainScreen].bounds.size.height - rect.origin.y;    [UIView animateWithDuration:duration animations:^{        [self.view layoutIfNeeded];    }];}#pragma mark - <UITableViewDataSource>- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{    return self.messages.count;}- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{    XMGMessageCell *cell = [tableView dequeueReusableCellWithIdentifier:@"message"];        cell.message = self.messages[indexPath.row];        return cell;}#pragma mark - <UITableViewDelegate>- (CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath{    return 200;}- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{    XMGMessage *message = self.messages[indexPath.row];    return message.cellHeight;}- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView{    // 退出键盘//    [self.messageField resignFirstResponder];//    [self.messageField endEditing:YES];    [self.view endEditing:YES];}@end