经过大量的试验和错误，我放弃了，并提出了这个问题。我见过很多人有类似的问题，但不能得到所有的答案工作正确。
我有一个由自定义单元格组成的UITableView。单元格由相邻的5个文本字段组成(有点像网格)。
当我试图滚动和编辑UITableView底部的单元格时，我不能设法让我的单元格正确地定位在键盘上方。
我看到过很多关于改变视图大小的回答……但到目前为止，没有一种效果很好。
谁能用一个具体的代码示例来阐明这样做的“正确”方式?
当前回答
在viewdidload
-(void)viewdidload{
[super viewdidload];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
-(void)keyboardWillChange:(NSNotification*)sender{
NSLog(@"keyboardwillchange sender %@",sender);
float margin=0 // set your own topmargin
CGFloat originY = [[sender.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].origin.y;
if (originY >= self.view.frame.size.height){
NSLog(@"keyboardclose");
[tb_ setFrame:CGRectMake(0, margin, self.view.frame.size.width, self.view.frame.size.height-margin)];
}else{
NSLog(@"keyobard on");
float adjustedHeight = self.view.frame.size.height - margin - (self.view.frame.size.height-originY);
[tb_ setFrame:CGRectMake(0, margin, self.view.frame.size.width, adjustedHeight)];
}
}
其他回答
一个更加流线型的解决方案。它滑入UITextField委托方法，所以它不需要搞砸/ UIKeyboard通知。
实现注意事项:
kSettingsRowHeight——UITableViewCell的高度。
offsetTarget和offsetThreshold基于kSettingsRowHeight。如果使用不同的行高，则将这些值设置为point的y属性。[alt:以不同的方式计算行偏移量。]
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
CGFloat offsetTarget = 113.0f; // 3rd row
CGFloat offsetThreshold = 248.0f; // 6th row (i.e. 2nd-to-last row)
CGPoint point = [self.tableView convertPoint:CGPointZero fromView:textField];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:0.2];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
CGRect frame = self.tableView.frame;
if (point.y > offsetThreshold) {
self.tableView.frame = CGRectMake(0.0f,
offsetTarget - point.y + kSettingsRowHeight,
frame.size.width,
frame.size.height);
} else if (point.y > offsetTarget) {
self.tableView.frame = CGRectMake(0.0f,
offsetTarget - point.y,
frame.size.width,
frame.size.height);
} else {
self.tableView.frame = CGRectMake(0.0f,
0.0f,
frame.size.width,
frame.size.height);
}
[UIView commitAnimations];
return YES;
}
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
[textField resignFirstResponder];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationBeginsFromCurrentState:YES];
[UIView setAnimationDuration:0.2];
[UIView setAnimationCurve:UIViewAnimationCurveEaseOut];
CGRect frame = self.tableView.frame;
self.tableView.frame = CGRectMake(0.0f,
0.0f,
frame.size.width,
frame.size.height);
[UIView commitAnimations];
return YES;
}
我认为最好的方法是通过UITableViewController。
如果你想在UIViewController中创建一个UITableView，只需要用一个嵌入的UITableViewController创建一个ContentView，并在UIViewController的viedDidLoad中放入以下代码行:
self.tableView = ((UITableViewController*)self.childViewControllers[0]).tableView;
self.tableView.delegate = self;
self.tableView.dataSource = self;
容易,)
在viewdidload
-(void)viewdidload{
[super viewdidload];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillChangeFrameNotification object:nil];
}
-(void)keyboardWillChange:(NSNotification*)sender{
NSLog(@"keyboardwillchange sender %@",sender);
float margin=0 // set your own topmargin
CGFloat originY = [[sender.userInfo objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].origin.y;
if (originY >= self.view.frame.size.height){
NSLog(@"keyboardclose");
[tb_ setFrame:CGRectMake(0, margin, self.view.frame.size.width, self.view.frame.size.height-margin)];
}else{
NSLog(@"keyobard on");
float adjustedHeight = self.view.frame.size.height - margin - (self.view.frame.size.height-originY);
[tb_ setFrame:CGRectMake(0, margin, self.view.frame.size.width, adjustedHeight)];
}
}
Swift 3-4动画和键盘帧改变的解决方案:
首先，创建Bool类型:
// MARK: - Private Properties
private var isKeyboardShowing = false
其次，在系统键盘通知中添加观察者:
// MARK: - Overriding ViewController Life Cycle Methods
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: .UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: .UIKeyboardWillHide, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChangeFrame), name: .UIKeyboardWillChangeFrame, object: nil)
}
第三，准备动画功能:
func adjustTableViewInsets(keyboardHeight: CGFloat, duration: NSNumber, curve: NSNumber){
var extraHeight: CGFloat = 0
if keyboardHeight > 0 {
extraHeight = 20
isKeyboardShowing = true
} else {
isKeyboardShowing = false
}
let contentInset = UIEdgeInsets(top: 0, left: 0, bottom: keyboardHeight + extraHeight, right: 0)
func animateFunc() {
//refresh constraints
//self.view.layoutSubviews()
tableView.contentInset = contentInset
}
UIView.animate(withDuration: TimeInterval(duration), delay: 0, options: [UIViewAnimationOptions(rawValue: UInt(curve))], animations: animateFunc, completion: nil)
}
然后添加target/action方法(由观察者调用):
// MARK: - Target/Selector Actions
func keyboardWillShow(notification: NSNotification) {
if !isKeyboardShowing {
if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
let keyboardHeight = keyboardSize.height
let duration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as! NSNumber
let curve = notification.userInfo?[UIKeyboardAnimationCurveUserInfoKey] as! NSNumber
adjustTableViewInsets(keyboardHeight: keyboardHeight, duration: duration, curve: curve)
}
}
}
func keyboardWillHide(notification: NSNotification) {
let duration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as! NSNumber
let curve = notification.userInfo?[UIKeyboardAnimationCurveUserInfoKey] as! NSNumber
adjustTableViewInsets(keyboardHeight: 0, duration: duration, curve: curve)
}
func keyboardWillChangeFrame(notification: NSNotification) {
if isKeyboardShowing {
let duration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as! NSNumber
let curve = notification.userInfo?[UIKeyboardAnimationCurveUserInfoKey] as! NSNumber
if let newKeyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
let keyboardHeight = newKeyboardSize.height
adjustTableViewInsets(keyboardHeight: keyboardHeight, duration: duration, curve: curve)
}
}
}
最后，不要忘记在deinit或viewWillDisappear中删除观察者:
deinit {
NotificationCenter.default.removeObserver(self)
}
另一个简单的方法(只适用于一个部分)
//cellForRowAtIndexPath
UItextField *tf;
[cell addSubview:tf];
tf.tag = indexPath.row;
tf.delegate = self;
//textFieldDidBeginEditing:(UITextField *)text
[[self.tableView scrollToRowsAtIndexPath:[NSIndexPath indexPathForRow:text.tag in section:SECTIONINTEGER] animated:YES];
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