关于ios：在键盘演示中点击UITextView或UITextField的UIScrollView问题

UIScrollView issue on tapping UITextView or UITextField on keyboard presentation

我有一个UIScrollView，其中包含UITextFields和UITextViews。我已经注册了UIKeyboardDidChangeFrameNotification。当我点击文本字段或文本视图时，DID更改帧通知操作被触发，我调整滚动视图的contentOffset，如下所示

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- (void)keyboardDidChangeFrame:(NSNotification *)notification
{
CGRect keyboardEndFrame;
[[[notification userInfo] objectForKey:UIKeyboardFrameEndUserInfoKey] getValue:&keyboardEndFrame];
CGRect screenRect = [[UIScreen mainScreen] bounds];
CGRect intersection;
UIView *theFirstResponder = [[UIApplication sharedApplication].keyWindow findFirstResponder];

if ([theFirstResponder isKindOfClass:[UITextView class]]) {
if ([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationLandscapeLeft) {
keyboardEndFrame = CGRectMake(keyboardEndFrame.origin.y, 416, keyboardEndFrame.size.height, keyboardEndFrame.size.width);
}
else if ([UIApplication sharedApplication].statusBarOrientation == UIInterfaceOrientationLandscapeRight)
{
keyboardEndFrame = CGRectMake(keyboardEndFrame.origin.y, 0, keyboardEndFrame.size.height, keyboardEndFrame.size.width);
}
}
else
keyboardEndFrame = CGRectMake(keyboardEndFrame.origin.y, keyboardEndFrame.origin.x, keyboardEndFrame.size.height, keyboardEndFrame.size.width);

screenRect = CGRectMake(screenRect.origin.y, screenRect.origin.x, screenRect.size.height, screenRect.size.width);
if(CGRectEqualToRect(lastKBDRect, keyboardEndFrame)) {
return;
}
lastKBDRect = keyboardEndFrame;
if (CGRectIntersectsRect(keyboardEndFrame, screenRect)) {
// Keyboard is visible

//Convert Frame of the first responder, in context of the view that needs to be shifted
UIView *firstResponder = [[UIApplication sharedApplication].keyWindow findFirstResponder];
CGRect theRect = [firstResponder convertRect:firstResponder.frame toView:[UIApplication sharedApplication].keyWindow];
theRect = CGRectMake(theRect.origin.y, theRect.origin.x > 768 ? 750 : theRect.origin.x, theRect.size.height, theRect.size.width);

intersection = CGRectIntersection(keyboardEndFrame, theRect);

//If intersection is null, then no need to shift anything. Simply return.
if(CGRectIsNull(intersection)) {
return;
}
//Shift the view so that the first responder view is completely visible, keeping the constraint that the origin of the first responder view is also visible.

//Remember the current offset, so when we shift the view back, we shift it to the proper position.
if (!wasContentViewShifted) {
lastContentOffset = contentScrollView.contentOffset;
lastContentSize = contentScrollView.contentSize;
wasContentViewShifted = YES;
}

CGFloat offset = theRect.origin.y + theRect.size.height - keyboardEndFrame.origin.y;
if((theRect.origin.y - offset) < 40) {
offset += 42;
}
[UIView animateWithDuration:0.3f animations:^{
contentScrollView.contentOffset = CGPointMake(0, contentScrollView.contentOffset.y + offset);
contentScrollView.contentSize = CGSizeMake(0, lastContentSize.height + (600 - theRect.size.height));
}];

} else {
// Keyboard is hidden. Move the view back only if it was shifted.
if(wasContentViewShifted) {
wasContentViewShifted = NO;
[UIView animateWithDuration:0.3f animations:^{
contentScrollView.contentOffset = lastContentOffset;
contentScrollView.contentSize = lastContentSize;
}];
}
}
}

应用程序仅支持横向。我现在面临的问题是

点击textview会显示键盘，如果textview被键盘隐藏，它会滚动到顶部。现在，更改方向(横向左移到横向右移)会使文本视图进一步滚动到顶部，因此不可见。

文本视图的滚动有时适用于横向左方向，但不适用于横向右方向，反之亦然。这是因为我使用的keyboardEndFrame值。我不应该使用keyboardEndFrame原点值吗？如果没有，还有什么选择呢？

有时，它适用于文本字段，但不适用于文本视图。

你可以试着用这个来代替复杂的解决方案。这里还可以找到一个更简单的解决方案。

此外，不建议像您所做的那样对框架进行硬编码。有关更多详细信息，请参阅Apple文档。