我想在键盘出现时调整文本视图的大小。我的代码如下。我有自动布局,因此使用textView->来自superview的底部空间的约束,并通过IBOutlet distanceFromBottom引用它。
- (void)keyboardWillShow:(NSNotification *)notification
{
[UIView animateWithDuration:0.3 animations:^{
NSDictionary* d = [notification userInfo];
CGRect r = [d[UIKeyboardFrameEndUserInfoKey] CGRectValue];
r = [textView convertRect:r fromView:Nil];
if(IS_IPHONE_6||IS_IPHONE_6P)
distanceFromBottom.constant = r.origin.y+78;
else if(IS_IPHONE_5)
distanceFromBottom.constant = r.origin.y+183;
}];
}
上面的代码非常完美。我不明白为什么我需要为iPhone6添加+78或为iPhone5添加183。这两个值我带来了反复试验。如果我不添加这些内容,则textView会在键盘下方延伸。请帮我解开这个谜。
答案 0 :(得分:12)
在viewWillAppear
方法中,添加以下内容:
- (void) viewWillAppear:(BOOL)paramAnimated{
[super viewWillAppear:paramAnimated];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(handleKeyboardDidShow:)
name:UIKeyboardDidShowNotification object:nil];
[[NSNotificationCenter defaultCenter]
addObserver:self
selector:@selector(handleKeyboardWillHide:)
name:UIKeyboardWillHideNotification object:nil];
}
然后实现通知中心的两种方法,如下所示:
- (void) handleKeyboardDidShow:(NSNotification *)paramNotification{
NSValue *keyboardRectAsObject =
[[paramNotification userInfo]
objectForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardRect = CGRectZero;
[keyboardRectAsObject getValue:&keyboardRect];
yourTextView.contentInset =
UIEdgeInsetsMake(0.0f,
0.0f,
keyboardRect.size.height,
0.0f);
}
另一个喜欢:
- (void) handleKeyboardWillHide:(NSNotification *)paramNotification{
yourTextView.contentInset = UIEdgeInsetsZero;
}
它适用于所有设备;)
答案 1 :(得分:5)
Swift / Mod Version
使用上面的内容,我做了一些调整,以便在键盘显示和隐藏时使用NSLayoutConstraint
更改高度constant
属性。如果您旋转设备,这也适用。
<强> 1。设置TextView约束
然后控制从您的高度约束拖出一个出口到该类。
<强> 2。添加以下
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
NSNotificationCenter.defaultCenter().addObserver(self, selector:#selector(SkillDescriptionViewController.keyboardWillShowHandle(_:)), name: UIKeyboardDidShowNotification, object: nil)
NSNotificationCenter.defaultCenter().addObserver(self, selector:#selector(SkillDescriptionViewController.keyboardWillHideHandle), name: UIKeyboardWillHideNotification, object: nil)
}
func keyboardWillShowHandle(note:NSNotification) {
guard let keyboardRect = note.userInfo![UIKeyboardFrameEndUserInfoKey] as? NSValue else { return }
let kbFrame = keyboardRect.CGRectValue()
tvHeight.constant = -kbFrame.height
view.layoutIfNeeded()
}
func keyboardWillHideHandle() {
tvHeight.constant = 0
view.layoutIfNeeded()
}
答案 2 :(得分:0)
基于上述答案的Swift 5解决方案
通知API已更改(20190707),以及如何使用#selector
当键盘弹出键覆盖UITextView导致用户无法看到已编辑的文本时,可以使用此处的解决方案。
import UIKit
class DCNodeLogEntryViewController: UIViewController {
@IBOutlet weak var textViewNodeLogEntry: UITextView!
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
NotificationCenter.default.addObserver(
self,
selector: #selector(DCNodeLogEntryViewController.handleKeyboardDidShow(notification:)),
name: UIResponder.keyboardDidShowNotification,
object: nil
)
NotificationCenter.default.addObserver(
self,
selector: #selector(DCNodeLogEntryViewController.handleKeybolardWillHide),
name: UIResponder.keyboardWillHideNotification,
object: nil
)
}
@objc func handleKeyboardDidShow(notification: NSNotification) {
guard let keyboardRect = notification
.userInfo![UIResponder.keyboardFrameEndUserInfoKey]
as? NSValue else { return }
let frameKeyboard = keyboardRect.cgRectValue
textViewNodeLogEntry.contentInset = UIEdgeInsets(
top: 0.0,
left: 0.0,
bottom: frameKeyboard.size.height,
right: 0.0
)
view.layoutIfNeeded()
}
@objc func handleKeybolardWillHide() {
textViewNodeLogEntry.contentInset = .zero
}
}