UITextView自适应高度
- (float) heightForTextView: (UITextView *)textView WithText: (NSString *) strText{
float fPadding = 10.0;
CGSize constraint = CGSizeMake(textView.contentSize.width - fPadding, CGFLOAT_MAX);
CGSize size = [strText sizeWithFont: textView.fontconstrainedToSize:constraint lineBreakMode:NSLineBreakByWordWrapping];
float fHeight = size.height + 5.0;
return fHeight;
}