Obj-C语言 返回到原始状态时动画延迟?

Question

当我的键盘被激活时，我使用以下代码向上移动视图和我的表视图。但是，当键盘关闭时，upView 在键盘关闭后需要稳定 2 秒才能返回到原来的位置(另一方面，tableView 是即时的)。为什么会这样？

- (void)viewDidLoad {
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillChange:) name:UIKeyboardWillShowNotification object:nil];

}
- (void)keyboardWillChange:(NSNotification *)notification {

NSDictionary* keyboardInfo = [notification userInfo];
NSValue* keyboardFrameBegin = [keyboardInfo valueForKey:UIKeyboardFrameEndUserInfoKey];
CGRect keyboardFrameBeginRect = [keyboardFrameBegin CGRectValue];
UITabBarController *tabBarController = [UITabBarController new];
CGFloat tabBarHeight = tabBarController.tabBar.frame.size.height;

self.keyboardHeight = keyboardFrameBeginRect.size.height - tabBarHeight;
}

- (void) animateTextView:(BOOL) up
{
const int movementDistance = self.keyboardHeight;
const float movementDuration = 0.2f;
int movement= movement = (up ? -movementDistance : movementDistance);

[UIView beginAnimations: @"anim" context: nil];
[UIView setAnimationBeginsFromCurrentState: YES];
[UIView setAnimationDuration: movementDuration];
self.upView.frame = CGRectOffset(self.upView.frame, 0, movement);
[UIView setAnimationDidStopSelector:@selector(afterAnimationStops)];
[UIView commitAnimations];
self.tableView.frame = CGRectOffset(self.tableView.frame, 0, movement);
[UIView setAnimationDidStopSelector:@selector(afterAnimationStops)];
[UIView commitAnimations];
}
- (void)textViewDidBeginEditing:(UITextView *)textView
{
[self animateTextView:YES];
}
- (void)textViewDidEndEditing:(UITextView *)textView
{
[self animateTextView:NO];
}

更新的代码

.m

- (void)handleKeyboard:(NSNotification*)aNotification{
NSDictionary* info = [aNotification userInfo];
NSValue* value = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
NSTimeInterval duration = 3;
[value getValue:&duration];
if (aNotification.name == UIKeyboardWillHideNotification) {
/** KEYBOARD HIDE **/
[UIView animateWithDuration:0 animations:^{ self.upView.frame = CGRectOffset(self.upView.frame, 0, self.keyboardHeight); self.tableView.frame = CGRectOffset(self.tableView.frame, 0, self.keyboardHeight); } completion:^(BOOL finished) {}];

[self moveCustomView:NO duration:duration];
NSLog(@"CLOSED!");
}
if (aNotification.name == UIKeyboardWillShowNotification) {
/** KEYBOARD SHOW **/
[UIView animateWithDuration:0 animations:^{ self.upView.frame = CGRectOffset(self.upView.frame, 0, -self.keyboardHeight); self.tableView.frame = CGRectOffset(self.tableView.frame, 0, -self.keyboardHeight); } completion:^(BOOL finished) {}];

[self moveCustomView:YES duration:duration];
}
}
- (void)moveCustomView:(BOOL)move duration:(NSTimeInterval)time{
}

Answer 1

此问题可能与动画持续时间有关，因此您可以让键盘显示和隐藏动画持续时间-(void)handleKeyboard:(NSNotification *)notification {}

并在同一函数中处理显示和隐藏自定义视图。将以下代码添加到viewDidLoad函数

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboard:) name:UIKeyboardWillHideNotification object:nil];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleKeyboard:) name:UIKeyboardWillShowNotification object:nil];

处理键盘操作和 UI 更改

- (void)handleKeyboard:(NSNotification*)aNotification{
NSDictionary* info = [aNotification userInfo];
NSValue* value = [info objectForKey:UIKeyboardAnimationDurationUserInfoKey];
NSTimeInterval duration = 0;
[value getValue:&duration];
if (aNotification.name == UIKeyboardWillHideNotification) {
/** KEYBOARD HIDE **/
//calculate your view frames and handle UI changes
/*
.
.
.
.
.
*/
[self moveCustomView:NO duration:duration];
}
if (aNotification.name == UIKeyboardWillShowNotification) {
/** KEYBOARD SHOW **/
//calculate your view frames and handle UI changes
/*
.
.
.
.
.
*/
[self moveCustomView:YES duration:duration];
}
}
- (void)moveCustomView:(BOOL)move duration:(NSTimeInterval)time{
}

Answer 2

我认为您需要使用线程立即调用动画...

- (void)textViewDidBeginEditing:(UITextView *)textView {
dispatch_async(dispatch_get_main_queue(), ^{
[self animateTextView:YES];
});
}
- (void)textViewDidEndEditing:(UITextView *)textView {
dispatch_async(dispatch_get_main_queue(), ^{
[self animateTextView:NO];
});
}

我不太了解你的问题，但试试这个，因为如果我们遇到这种类型的问题dispatch_async()会解决。