带有多行UITextField的iOS AlertController

Question

我正在开发一个应用程序,但它是一个相当古老的应用程序.客户不想花太多时间,所以我正在寻找一个简单快速的解决方案来解决这个问题.

用户必须为他们的配置文件写一个摘要,因此他们需要一个很大的空间来写入.整个应用程序是使用AlertController弹出窗口构建的,所以我想用一个更大的多行UITextField替换单行UITextField.

我能做些什么来实现这一目标？我目前添加了以下代码:

UIAlertController *alert = [UIAlertController alertControllerWithTitle:@"" message:@"Enter your summary" preferredStyle:UIAlertControllerStyleAlert];
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.placeholder = @"Summary";
        textField.autocapitalizationType = UITextAutocapitalizationTypeSentences;
        textField.text = _summaryLabel.text;

        NSLayoutConstraint *constraint = [NSLayoutConstraint constraintWithItem:textField attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1 constant: 110.0];
        [textField addConstraint:constraint];
        [textField layoutIfNeeded];
    }];

这意味着UITextField实际上更大,但它不是多线,它也是垂直居中的文本.我该怎么办？

Answer 1

正如@rmaddy所说,UITextField仅用于单线,你可以使用UITextView.

你可以通过这个完成:

如何在UIAlertController中使用UITextView

UIAlertController *alert = [UIAlertController
                            alertControllerWithTitle:@"Enter your summary"
                            message:@"\n\n\n\n\n\n\n\n"
                            preferredStyle:UIAlertControllerStyleAlert];
alert.view.autoresizesSubviews = YES;

UITextView *textView = [[UITextView alloc] initWithFrame:CGRectZero];
textView.translatesAutoresizingMaskIntoConstraints = NO;

NSLayoutConstraint *leadConstraint = [NSLayoutConstraint constraintWithItem:alert.view attribute:NSLayoutAttributeLeading relatedBy:NSLayoutRelationEqual toItem:textView attribute:NSLayoutAttributeLeading multiplier:1.0 constant:-8.0];
NSLayoutConstraint *trailConstraint = [NSLayoutConstraint constraintWithItem:alert.view attribute:NSLayoutAttributeTrailing relatedBy:NSLayoutRelationEqual toItem:textView attribute:NSLayoutAttributeTrailing multiplier:1.0 constant:8.0];

NSLayoutConstraint *topConstraint = [NSLayoutConstraint constraintWithItem:alert.view attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:textView attribute:NSLayoutAttributeTop multiplier:1.0 constant:-64.0];
NSLayoutConstraint *bottomConstraint = [NSLayoutConstraint constraintWithItem:alert.view attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:textView attribute:NSLayoutAttributeBottom multiplier:1.0 constant:64.0];
[alert.view addSubview:textView];
[NSLayoutConstraint activateConstraints:@[leadConstraint, trailConstraint, topConstraint, bottomConstraint]];

[alert addAction: [UIAlertAction actionWithTitle:@"Done"style:UIAlertActionStyleDefault handler:^(UIAlertAction*action) {
    NSLog(@"%@", textView.text);
}]];

[self presentViewController:alert animated:YES completion:nil];

或使用UIAlertView:

如何在iOS中的UIAlertview中插入UITextView

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@""
                                                    message:@"Enter your summary"
                                                   delegate:self
                                          cancelButtonTitle:@"Cancel"
                                          otherButtonTitles:@"Done", nil];

UITextView *textView = [[UITextView alloc] initWithFrame:CGRectZero];
[alert setValue:textView forKey:@"accessoryView"];
[alert show];

或者自定义您自己的警报,如ios-custom-alertview