Iphone – UITextView autoscroll to last line

cocoa-touchiphoneuiscrollviewuitextview

When writing in a UITextView more text than can fit entirely inside it, the text will scroll up and the cursor will often place itself one or two lines above the view's bottom line. This is a bit frustrating as I want my application to make good use of the entire height of the text view.

Basically what I want is to configure the UITextView to write up to it's lowest part and not use it just for scrolling.

I've seen some similar questions here, here and here. However I've not seen a proper solution yet.

Thanks

Best Answer

I've a slightly different implementation (I want to disable scrolling), but I also had to stop the cursor jumping out of my UITextView. To do this, I implemented a null scrollRectToVisible in my UITextView subclass. Like this:

- (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated
{
// do nothing. This fixes the cursor jumping above the field defect.
}

Related Solutions

Ios – How to size a UITextView to its content

This works for both iOS 6.1 and iOS 7:

- (void)textViewDidChange:(UITextView *)textView
{
    CGFloat fixedWidth = textView.frame.size.width;
    CGSize newSize = [textView sizeThatFits:CGSizeMake(fixedWidth, MAXFLOAT)];
    CGRect newFrame = textView.frame;
    newFrame.size = CGSizeMake(fmaxf(newSize.width, fixedWidth), newSize.height);
    textView.frame = newFrame;
}

Or in Swift (Works with Swift 4.1 in iOS 11)

let fixedWidth = textView.frame.size.width
let newSize = textView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude))
textView.frame.size = CGSize(width: max(newSize.width, fixedWidth), height: newSize.height)

If you want support for iOS 6.1 then you should also:

textview.scrollEnabled = NO;

Ios – How to lose margin/padding in UITextView

For iOS 7.0, I've found that the contentInset trick no longer works. This is the code I used to get rid of the margin/padding in iOS 7.

This brings the left edge of the text to the left edge of the container:

textView.textContainer.lineFragmentPadding = 0

This causes the top of the text to align with the top of the container:

textView.textContainerInset = .zero

Both lines are needed to completely remove the margin/padding.

Best Answer

Related Solutions

Ios – How to size a UITextView to its content

Ios – How to lose margin/padding in UITextView

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