UITextView输入时,最下面一行被遮挡

当我们使用UITextView时,出现出输入文字时, 输入文字的高度超出UITextView的高度一行时才开始滚动,而且最下面一行是被遮挡的.
当出现这种情况的时候我们可以使用一下方法来解决:

1.设置内边距

contentTextView.contentInset = UIEdgeInsetsMake(0.0, 0.0, 15.0, 0.0);

2.在遵守代理之后在代理方法textViewDidChange中:

-(void)textViewDidChange:(UITextView *)textView {
 NSRange selection = textView.selectedRange;
 if (selection.location + selection.length == [textView.text length]) {
 CGRect caretRect = [textView caretRectForPosition:textView.selectedTextRange.start];
 CGFloat overflow = caretRect.origin.y + caretRect.size.height - (textView.contentOffset.y + textView.bounds.size.height - textView.contentInset.bottom - textView.contentInset.top);
 if (overflow > 0.0f) {
 CGPoint offset = textView.contentOffset;
 offset.y += overflow + 7.0f;
 [UIView animateWithDuration:0.2f animations:^{
 [textView setContentOffset:offset];
 }];
 }
 } else {
 [textView scrollRangeToVisible:selection];
 }
 }