Obj-c:键盘激活时向上移动 uitextview

Question

当我的用户在我的文本视图中键入时，我希望文本视图向上移动，以便键盘不会覆盖它。我正在使用下面的代码，但没有任何东西向上移动，键盘继续覆盖我的文本视图。我该如何解决这个问题？

ViewController.h

 @property (strong, nonatomic) IBOutlet UITextView *replyField;

ViewController.m

- (void)viewDidLoad {
    [super viewDidLoad];

[self.replyField setReturnKeyType:UIReturnKeyDefault];
}
- (void)dismissKeyboard
{
    [self.replyField resignFirstResponder];
}
- (void)textViewDidBeginEditing:(UITextView *)textView
{
    [self animateTextView: YES];
}

- (void)textViewDidEndEditing:(UITextView *)textView
{
    [self animateTextView:NO];
}
- (void) animateTextView:(BOOL) up
{
    const int movementDistance = -250; // tweak as needed
    const float movementDuration = 0.3f; // tweak as needed
    int movement= movement = (up ? -movementDistance : movementDistance);
    NSLog(@"%d",movement);
    [UIView beginAnimations: @"anim" context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];
    self.view.frame = CGRectOffset(self.inputView.frame, 0, movement);
    [UIView commitAnimations];
}

Answer 1

看起来animateTextView方法中有 2 个错误：

• 原始值 -250 会导致错误的移动方向(up ? -movementDistance : movementDistance)

• self.view.frame = CGRectOffset(self.inputView.frame, 0, movement);将更改self.view的框架，而不是textView的框架。

改进（在我的Xcode中测试的代码）：

- (void)textViewDidBeginEditing:(UITextView *)textView{
    [self animateTextView:textView isUp:YES];
}
- (void)textViewDidEndEditing:(UITextView *)textView{
    [self animateTextView:textView isUp:NO];
}
- (void)animateTextView:(UITextView *)textView isUp:(BOOL)up{
    const int movementDistance = 250; // tweak as needed
    const float movementDuration = 0.3f; // tweak as needed
    int movement = (up ? -movementDistance : movementDistance);
    NSLog(@"%d",movement);
    [UIView beginAnimations: @"anim" context: nil];
    [UIView setAnimationBeginsFromCurrentState: YES];
    [UIView setAnimationDuration: movementDuration];
    textView.frame = CGRectOffset(textView.frame, 0, movement);
    [UIView commitAnimations];
}
//To close keyboard when click Return key.
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
    if ([text isEqualToString:@"n"]) {
        [textView resignFirstResponder];
        return NO;
    }
    return YES;
}

就像@El番茄说的，记得为textView设置委托：

[self.replyField setDelegate:self];