Obj-c：键盘激活时向上移动 uitextview？

Question

当我的用户在我的 textview 中键入时，我希望 textview 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。 我怎样才能解决这个问题？

视图控制器.h

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

视图控制器.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 导致错误的移动方向(up ? -movementDistance : movementDistance)

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

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 Tomato 说的，记得为 textView 设置委托：

[self.replyField setDelegate:self];