- (void)viewDidLoad {
self.automaticallyAdjustsScrollViewInsets = NO;
//监听键盘的通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChangeFrameNotify:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
_wasKeyboardManagerEnabled = [[IQKeyboardManager sharedManager]isEnabled];
[[IQKeyboardManager sharedManager] setEnable:NO];
}
-(void)viewDidDisappear:(BOOL)animated {
{
[super viewWillDisappear:animated];
[[IQKeyboardManager sharedManager] setEnable:_wasKeyboardManagerEnabled];
}
/**
* 点击了return按钮(键盘最右下角的按钮)就会调用
*/
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
[self sendMessage];
return YES;
}
/**
* 当键盘改变了frame(位置和尺寸)的时候调用
*/
-(void)keyboardWillChangeFrameNotify:(NSNotification*)notify {
// 0.取出键盘动画的时间
CGFloat duration = [notify.userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
// 1.取得键盘最后的frame
CGRect keyboardFrame = [notify.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
// 2.计算控制器的view需要平移的距离
CGFloat transformY = keyboardFrame.origin.y - self.view.frame.size.height;
// 3.执行动画
[UIView animateWithDuration:duration animations:^{
self.myTableView.frame = CGRectMake(0, 0, SCREENW, SCREENH + transformY - self.inputView.height);
self.tableViewBottomConstraint.constant = -transformY + 44;// tableView的bottom距父视图bottom的距离
self.inputView.transform = CGAffineTransformMakeTranslation(0, transformY);
[self scrollTableViewToBottom];
}];
}
/**
* tableView快速滚动到底部
*/
- (void)scrollTableViewToBottom {
if (self.messageFrames.count) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:(self.messageFrames.count - 1) inSection:0];
[self.myTableView scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
}
}
- (void)dealloc
{
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
网友评论