#pragmamark - TextFieldDelegate
-(BOOL)textFieldShouldBeginEditing:(UITextField*)textField{
if(textField ==_usernameTextField) {
_passwordTextField.text=@"";
}
returnYES;
}
如果密码的field不为空，点击账号时会将密码置为空，根据实际情况，看是否需要这样做
- (BOOL)textFieldShouldReturn:(UITextField*)textField
{
if(textField ==_usernameTextField) {
[_usernameTextFieldresignFirstResponder];
[_passwordTextFieldbecomeFirstResponder];
}elseif(textField ==_passwordTextField) {
[_passwordTextFieldresignFirstResponder];
[selfdoLogin:nil];
}
returnYES;
}
点击return，如果是账号field...如果是密码field,提高用户体验
