iOS Objective-C 在 UIAlertView 中换行 UITextField 的文本并根据内容动态调整高度 [英] iOS Objective-C wrap text of UITextField in UIAlertView and dynamically adjust height based on content

问题描述

我有一个 UIAlertView 和 UIAlertViewStylePlainTextInput 的 alertViewStyle.我试图找到一种方法，使 UIAlertView 的 UITextField 调整其高度并根据用户键入的内容包装其文本.

I have a UIAlertView with the alertViewStyle of UIAlertViewStylePlainTextInput. I'm trying to find a way to make the UITextField of the UIAlertView adjust its height and wrap its text based on its content as the user types.

老实说，我对如何做到这一点一无所知.

To be quite honest, I haven't the slightest clue how to do this.

这是我的一些代码:

-(void)updateTicket:(id)sender
{
    UIButton *sndr = (UIButton*)sender;
    int index = sndr.tag;

    UIAlertView *alert = [[UIAlertView alloc] init];
    [alert setTag:-7];
    [alert setDelegate:self];
    [alert setTitle:[NSString stringWithFormat:@"Update Ticket #%i", [ticketIDs[index] intValue]]];
    alert.alertViewStyle = UIAlertViewStylePlainTextInput;
    [alert textFieldAtIndex:0].placeholder = @"Note";
    [alert textFieldAtIndex:0].tag = index;
    [alert textFieldAtIndex:0].autocapitalizationType = UITextAutocapitalizationTypeSentences;
    [alert textFieldAtIndex:0].autocorrectionType = UITextAutocorrectionTypeYes;
    [alert textFieldAtIndex:0].autoresizingMask = UIViewAutoresizingFlexibleHeight;
    [alert addButtonWithTitle:@"Cancel"];
    [alert addButtonWithTitle:@"OK"];
    [alert setCancelButtonIndex:0];
    [alert show];
}

推荐答案

UITextField 不可能有多行和动态高度.

It is not possible to have a UITextField with multiple lines and dynamic height.

要实现这一点，请创建一个自定义警报并添加一个 UITextView，因为 UITextView 可以有多行.覆盖 textViewDidChange: 并计算 textview 中文本的大小sizeWithFont:constrainedToSize:lineBreakMode:.它将根据高度返回 CGSize 调整 UITextView 和警报的高度.

To achieve this please create a custom alert and add a UITextView as UITextViewcan have multiple lines. Override the textViewDidChange: and calculate the size of the text in the textview with sizeWithFont:constrainedToSize:lineBreakMode:. It will return the CGSize based on the height adjust the height of the UITextView and the alert.

谢谢

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