if (!_accountTextField.text.length || !_passwordTextField.text.length) {
submit.alpha = 0.4; submit.enabled = NO; }}本文共 176 字，大约阅读时间需要 1 分钟。
if (!_accountTextField.text.length || !_passwordTextField.text.length) {
submit.alpha = 0.4; submit.enabled = NO; }}转载于:https://www.cnblogs.com/huoxingdeguoguo/p/4670632.html