給textview添加一個label做爲子視圖 而後實現下面代理便可 label高度微調spa
#pragma mark UITextViewDeleget.net
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{3d
if (![text isEqualToString:@"" ])代理
{orm
_titleLab.hidden = YES;get
}it
if ([text isEqualToString:@"" ] && range.location == 0 && range.length == 1)io
{class
_titleLab.hidden = NO;margin
}
return YES;
}