iOS之自動調節輸入文本框的高度

//自動調節輸入文本框的高度

- (void)textViewDidChange:(UITableView *)textView{

    float height;

    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7) {

        CGRect textFrame = [[self.textView layoutManager] usedRectForTextContainer:[self.textView textContainer]];

        height = textFrame.size.height;

    }

    else{

        height = self.textView.contentSize.height;

    }

    self.textView.frame = CGRectMake(self.textView.frame.origin.x, self.textView.frame.origin.y, self.textView.frame.size.width, height);

}