如何在 iOS 7 中显示键盘时重新调整 UITextView 的大小 [英] How to re-size UITextView when keyboard shown with iOS 7

问题描述

I have a view controller which contains a full-screen UITextView. When the keyboard is shown I would like to resize the text view so that it is not hidden under the keyboard.

This is a fairly standard approach with iOS, as described in this question:

How to resize UITextView on iOS when a keyboard appears?

However, with iOS 7, if the user taps on the text view in the bottom half of the screen, when the text view resizes, the cursor remains offscreen. The text view only scrolls to bring the cursor into view if when the user hits enter.

解决方案

Whilst the answer given by @Divya lead me to the correct solution (so I awarded the bounty), it is not a terribly clear answer! Here it is in detail:

The standard approach to ensuring that a text view is not hidden by the on-screen keyboard is to update its frame when the keyboard is shown, as detailed in this question:

How to resize UITextView on iOS when a keyboard appears?

However, with iOS 7, if you change the text view frame within your handler for the UIKeyboardWillShowNotification notification, the cursor will remain off screen as described in this question.

The fix for this issue is to change the text view frame in response to the textViewDidBeginEditing delegate method instead:

@implementation ViewController {
    CGSize _keyboardSize;
    UITextView* textView;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    textView = [[UITextView alloc] initWithFrame:CGRectInset(self.view.bounds, 20.0, 20.0)];    textView.delegate = self;
    textView.returnKeyType = UIReturnKeyDone;
    textView.backgroundColor = [UIColor greenColor];
    textView.textColor = [UIColor blackColor];
    [self.view addSubview:textView];


    NSMutableString *textString = [NSMutableString new];
    for (int i=0; i<100; i++) {
        [textString appendString:@"cheese
pizza
chips
"];
    }
    textView.text = textString;

}

- (void)textViewDidBeginEditing:(UITextView *)textView1 {
    CGRect textViewFrame = CGRectInset(self.view.bounds, 20.0, 20.0);
    textViewFrame.size.height -= 216;
    textView.frame = textViewFrame;
}

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{
    CGRect textViewFrame = CGRectInset(self.view.bounds, 20.0, 20.0);
    textView.frame = textViewFrame;
    [textView endEditing:YES];
    [super touchesBegan:touches withEvent:event];
}

@end

NOTE: unfortunately textViewDidBeginEdting fires before the UIKeyboardWillShowNotification notification, hence the need to hard-code the keyboard height.

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