Ios 显示键盘时调整UITextView的大小
我想在键盘出现时调整文本视图的大小。下面是我的代码。我打开了自动布局,因此使用了来自superview的textView->bottom space约束,并通过IBOutlet distance frombottom引用它Ios 显示键盘时调整UITextView的大小,ios,objective-c,uitextview,Ios,Objective C,Uitextview,我想在键盘出现时调整文本视图的大小。下面是我的代码。我打开了自动布局,因此使用了来自superview的textView->bottom space约束,并通过IBOutlet distance frombottom引用它 - (void)keyboardWillShow:(NSNotification *)notification { [UIView animateWithDuration:0.3 animations:^{ NSDictionary* d = [notificat
- (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;
}];
}
上面的代码工作得很完美。我不明白的是,为什么我需要为iPhone6添加+78或为iPhone5添加183。这两个价值观是我反复尝试的结果。如果我不添加这些,textView将扩展到键盘下方。请帮我解开这个谜团。在
视图将出现的方法中,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);
}
另一种是:
- (void) handleKeyboardWillHide:(NSNotification *)paramNotification{
yourTextView.contentInset = UIEdgeInsetsZero;
}
它将适用于所有设备;) Swift/修改版
使用上述方法,我进行了一些调整,以在键盘显示和隐藏时使用NSLayoutConstraint
更改heightconstant
属性。如果旋转设备,这也可以工作
1。设置文本视图约束
然后控制从高度约束拖动一个出口到类
2。添加以下内容
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()
}
基于上述答案的Swift 5解决方案
通知API已更改(20190707)以及如何使用选择器
当键盘弹出窗口覆盖UITextView,导致用户无法查看已编辑的文本时,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
}
}
真棒,先生。工作很有魅力。:)