我有一个 UITextView，它在 iOS 7 中表现良好。在 iOS 8 中它表现得很奇怪。

当我输入变成两行的文本时，我更新了包含 TextView 的 inputView 的大小。我还更新了 textview 的大小，但不知何故它似乎滚动了第一行；但这并没有反射(reflect)在它的大小上。

iOS 7 行为视频(正确): https://www.dropbox.com/s/rr4pea6wudobmk8/iOS7.mov

iOS 8 行为视频: https://www.dropbox.com/s/iyqrsp41uz5mn85/iOS8.mov

我已经设置了[self setAutomaticallyAdjustsScrollViewInsets:NO];，但没有改变。 这对我没有帮助:What is Causing this Unwanted Content Inset with UITextView in iOS 8 (not there in iOS 7)?

这是我在 iOS8 中的 NSLog 的结果:

2014-12-22 02:02:48.104 Date For Date[68577:10129965] DID BEGIN: textContainerInset Top: 8.000000 - contentInset Bottom: 0.000000 - scrollIndicatorInset: 10.000000
2014-12-22 02:02:50.579 Date For Date[68577:10129965] DID CHANGE: textContainerInset Top: 8.000000 - contentInset Bottom: 0.000000 - scrollIndicatorInset: 10.000000
2014-12-22 02:02:50.768 Date For Date[68577:10129965] DID CHANGE: textContainerInset Top: 8.000000 - contentInset Bottom: 0.000000 - scrollIndicatorInset: 10.000000
2014-12-22 02:02:50.960 Date For Date[68577:10129965] DID CHANGE: textContainerInset Top: 8.000000 - contentInset Bottom: 0.000000 - scrollIndicatorInset: 10.000000
2014-12-22 02:02:51.168 Date For Date[68577:10129965] DID CHANGE: textContainerInset Top: 8.000000 - contentInset Bottom: 0.000000 - scrollIndicatorInset: 10.000000
2014-12-22 02:02:52.145 Date For Date[68577:10129965] DID CHANGE: textContainerInset Top: 8.000000 - contentInset Bottom: 0.000000 - scrollIndicatorInset: 10.000000
2014-12-22 02:02:52.408 Date For Date[68577:10129965] DID CHANGE: textContainerInset Top: 8.000000 - contentInset Bottom: 0.000000 - scrollIndicatorInset: 10.000000

这是我的代码:

- (void)textViewDidBeginEditing:(UITextView *)textView
{
    [textView becomeFirstResponder];

    if(!self.previousTextViewContentHeight)
        self.previousTextViewContentHeight = textView.contentSize.height;

    [self _scrollToBottom:YES];

    NSLog(@"DID BEGIN: textContainerInset Top: %f - contentInset Bottom: %f - scrollIndicatorInset: %f", textView.textContainerInset.top, textView.contentInset.top, textView.scrollIndicatorInsets.top);
}

- (void)textViewDidEndEditing:(UITextView *)textView
{
    [textView resignFirstResponder];
}

- (void)textViewDidChange:(UITextView *)textView
{
    // Textfield
    NSLog(@"DID CHANGE: textContainerInset Top: %f - contentInset Bottom: %f - scrollIndicatorInset: %f", textView.textContainerInset.top, textView.contentInset.top, textView.scrollIndicatorInsets.top);

    CGFloat maxHeight = [JSMessageInputView maxHeight];
    CGFloat textViewContentHeight = MIN(textView.contentSize.height, maxHeight);

    CGFloat changeInHeight = textViewContentHeight - self.previousTextViewContentHeight;

    self.previousTextViewContentHeight = MIN(textViewContentHeight, maxHeight);

    if(changeInHeight != 0.0f) {
        textView.frame = CGRectMake(6, 3, textView.frame.size.width, textView.frame.size.height + changeInHeight);

        textView.contentInset = UIEdgeInsetsMake(0.0f,
                                                 0.0f,
                                                 0.0f,
                                                 0.0f);

        [textView setContentSize:CGSizeMake(textView.contentSize.width, textView.contentSize.height + changeInHeight)];

        // Change table
        UIEdgeInsets insets = UIEdgeInsetsMake(0, 0.0f, self.bubbleTable.contentInset.bottom + changeInHeight, 0.0f);
        self.bubbleTable.contentInset = insets;
        self.bubbleTable.scrollIndicatorInsets = insets;

        [self _scrollToBottom:YES];

        // Change input view
        CGRect inputViewFrame = self.inputView.frame;
        self.inputView.frame = CGRectMake(0.0f,
                                          inputViewFrame.origin.y - changeInHeight,
                                          inputViewFrame.size.width,
                                          inputViewFrame.size.height + changeInHeight);
    }

    self.inputView.sendButton.enabled = ([textView.text trimWhitespace].length > 0);
}

我做错了什么？

最佳答案

为什么不使用 UITextView sizeThatFits 函数？它会自动计算所有填充的正确高度:

CGFloat textViewHeight = [textView sizeThatFits:CGSizeMake(textView.frame.size.width, MAXFLOAT)].height;

关于ios - UITextView 插入行为 iOS 7 与 iOS 8，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27595445/