我有一个 UIScrollView
,它包含 UITextFields
和 UITextViews
。我已经注册了 UIKeyboardDidChangeFrameNotification
。当我点击文本字段或 TextView 时,会触发 did change 帧通知操作,我调整 ScrollView 的 contentOffset
如下所示
- (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;
}];
}
}
}
该应用程序仅支持横向。 我在这里面临的问题是
- 点击 textView 会显示键盘,如果 textview 被键盘隐藏,则会滚动到顶部。现在,更改方向(从左横向到右横向)会使 textView 进一步滚动到顶部,因此不可见。
- TextView 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。这是因为我使用的是
keyboardEndFrame
值。我不应该使用keyboardEndFrame
原始值吗?如果不能,还有什么选择? - 有时它适用于 textField 但不适用于 textView。
最佳答案
您可以尝试使用 this 而不是拥有如此复杂的解决方案. 还可以找到一种更简单的解决方案 here .
此外,不建议像您一样对框架进行硬编码。引用apple documentation了解更多详情。
关于ios - 在键盘演示中点击 UITextView 或 UITextField 时出现 UIScrollView 问题,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15757527/