滚动视图 - 如何将对象保留在视图中
我有一个滚动视图，其中有许多 textfields，然后是一些 UISwitches 和 UIButtons，然后是更多 textfields。
我找到了 textFieldDidBeginEditing 事件，并使用该事件将 textfield 滚动到视图中。但我还没有发现 UISwitch 和 UIButton 等其他对象的类似内容。
有什么东西可以做到这一点吗？以下是我用于文本字段的代码：
- (void)textFieldDidBeginEditing:(UITextField *)textField {
[self scrollViewToCenterOfScreen:textField];
}
- (void)scrollViewToCenterOfScreen:(UIView *)theView {
CGFloat viewCenterY = theView.center.y;
CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame];
CGFloat availableHeight = applicationFrame.size.height - _keyboardHeight; // Remove area covered by keyboard
CGFloat y = viewCenterY - availableHeight / 2.0;
if (y < 0) {
y = 0;
}
ScrollView.contentSize = CGSizeMake(applicationFrame.size.width, applicationFrame.size.height + _keyboardHeight);
[ScrollView setContentOffset:CGPointMake(0, y) animated:YES];
}
I have a scroll view which has numerous textfields and then some UISwitches and UIButtons followed by more textfields.
I have found the textFieldDidBeginEditing event and use that to scroll the textfield into the view. But I have not found something similar for the other objects like the UISwitch and UIButton.
Is there something that does this? Below is the code I use for the textfields:
- (void)textFieldDidBeginEditing:(UITextField *)textField {
[self scrollViewToCenterOfScreen:textField];
}
- (void)scrollViewToCenterOfScreen:(UIView *)theView {
CGFloat viewCenterY = theView.center.y;
CGRect applicationFrame = [[UIScreen mainScreen] applicationFrame];
CGFloat availableHeight = applicationFrame.size.height - _keyboardHeight; // Remove area covered by keyboard
CGFloat y = viewCenterY - availableHeight / 2.0;
if (y < 0) {
y = 0;
}
ScrollView.contentSize = CGSizeMake(applicationFrame.size.width, applicationFrame.size.height + _keyboardHeight);
[ScrollView setContentOffset:CGPointMake(0, y) animated:YES];
}
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您可以使用 UIControlEventValueChanged 事件。
You can use the UIControlEventValueChanged event.