UITextView作为内容文本输入区域，有的时候我们需要根据内容动态改变文本区域的高度，效果如下:
定义UITextView，实现UITextViewDelegate:
| 1 2 3 4 5 6 7 8 9 10 11 12 | -(UITextView *)textView{ if (!_textView) { //http://www.cnblogs.com/xiaofeixiang/ _textView=[[UITextView alloc]initWithFrame:CGRectMake(30, 200, CGRectGetWidth([[UIScreen mainScreen] bounds])-60, 30)]; [_textView setTextColor:[UIColor redColor]]; [_textView.layer setBorderColor:[[UIColor blackColor] CGColor]]; [_textView setFont:[UIFont systemFontOfSize:15]]; [_textView.layer setBorderWidth:1.0f]; [_textView setDelegate:self]; } return _textView; } |
实现textViewDidChange方法:
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 | -( void )textViewDidChange:(UITextView *)textView{ //博客园-FlyElephant static CGFloat maxHeight =60.0f; CGRect frame = textView.frame; CGSize constraintSize = CGSizeMake(frame.size.width, MAXFLOAT); CGSize size = [textView sizeThatFits:constraintSize]; if (size.height<=frame.size.height) { size.height=frame.size.height; } else { if (size.height >= maxHeight) { size.height = maxHeight; textView.scrollEnabled = YES; // 允许滚动 } else { textView.scrollEnabled = NO; // 不允许滚动 } } textView.frame = CGRectMake(frame.origin.x, frame.origin.y, frame.size.width, size.height); } |