![](/img/trans.png)
[英]UIWebView within a UIScrollView like the Apple Mail.app
[英]Autoscroll UIScrollView to fit content like in native iOS Mail.app
創建新字母時,本機iOS Mail.app
具有強大的功能。 整個屏幕是一個UIScrollView
,而寫字母正文的位置是一個UITextView
,該滾動被禁用。
當您鍵入此TextView
的高度以及UIScrollView
的高度時,其動態變化,並且UIScrollView
向下滾動,從而在鍵盤上方留出一些像素來輸入新文本。
我知道這個過程已在做textViewDidChange
的方法,但在試圖做同樣的,不順心的事在我的代碼- UITextField
有時可能會往下走,下UIScrollView
。 這是我嘗試執行的操作:
-(void)textViewDidChange:(UITextView *)textView {
CGRect frame = emailTextView.frame;
frame.size.height = emailTextView.contentSize.height;
emailTextView.frame = frame;
mainScrollView.contentSize = CGSizeMake(320, emailTextView.contentSize.height + rightKeyboardSize.height + 20);
}
對這里出什么問題有任何想法嗎? 提前致謝!
好的,我實施了自己的示例項目來找到答案。 您應該替換您的名字。
首先,我將添加觀察者以檢測何時顯示或隱藏鍵盤:
- (void)addKeyboardObserver
{
// This could be in an init method.
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidShow:) name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil];
}
- (void)keyboardDidShow:(NSNotification*)notification
{
NSDictionary* keyboardInfo = [notification userInfo];
NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameBeginUserInfoKey];
_keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];
UIScrollView *_scrollView = (UIScrollView*)self.view;
_scrollView.frame = CGRectMake(_scrollView.frame.origin.x,
_scrollView.frame.origin.y,
_scrollView.frame.size.width,
_scrollView.frame.size.height - _keyboardFrameBeginRect.size.height);
}
- (void)keyboardDidHide:(NSNotification*)notification
{
UIScrollView *_scrollView = (UIScrollView*)self.view;
_scrollView.frame = CGRectMake(_scrollView.frame.origin.x,
_scrollView.frame.origin.y,
_scrollView.frame.size.width,
_scrollView.frame.size.height +
_keyboardFrameBeginRect.size.height);
}
然后,將textViewDidChange:方法更改為:
- (void)textViewDidChange:(UITextView *)textView
{
UIScrollView *_scrollView = (UIScrollView*)self.view;
_textView.frame = CGRectMake(_textView.frame.origin.x,
_textView.frame.origin.y,
_textView.contentSize.width,
_textView.contentSize.height);
_scrollView.contentSize = _textView.frame.size;
if (_scrollView.frame.size.height < _textView.frame.size.height) {
CGPoint bottomOffset = CGPointMake(0,_textView.frame.size.height-_keyboardFrameBeginRect.size.height);
[_scrollView setContentOffset:bottomOffset animated:NO];
}
}
祝好運!
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