iPhone上的UIAlertView中的UITextField - 如何使其响应？

Question

我将UITextField放入UIAlertView并将其向上移动,以便键盘不会使用以下代码覆盖它:

[dialog setDelegate:self];
[dialog setTitle:@"Enter Name"];
[dialog addButtonWithTitle:@"Cancel"];
[dialog addButtonWithTitle:@"OK"];
UITextField * nameField = [[UITextField alloc] initWithFrame:CGRectMake(20.0, 45.0, 245.0, 25.0)];
[nameField setBackgroundColor:[UIColor whiteColor]];
[dialog addSubview:nameField];
CGAffineTransform moveUp = CGAffineTransformMakeTranslation(0.0, 100.0);
[dialog setTransform: moveUp];
[dialog show];

我还有以下代码来处理警报视图:

- (void) alertView:(UIAlertView *)alert clickedButtonAtIndex:(NSInteger)buttonIndex{    
    NSLog(@"%d", (int) buttonIndex);
    if (buttonIndex == 1) { // OK pushed
        NSLog([alert textField].text); // does not log anything
    } else {
        // Cancel pushed
}}

我还有一个UIAlertViewExtended.h文件,其中包含:

@class UITextField, UILabel;

@interface UIAlertView(Extended)

-(UITextField *)textField;

@end

我的问题是如何获取用户输入的文本以及如何解除键盘？

谢谢,本

Answer 1

任何支持iOS 5.0以及ARC的人都可以设置这个直接的alertViewStyle属性:

-(void)showAlertWithTextField{
    UIAlertView* dialog = [[UIAlertView alloc] initWithTitle:@"Enter Name" message:@"" delegate:self cancelButtonTitle:@"Cancel" otherButtonTitles:@"Add", nil];    
    [dialog setAlertViewStyle:UIAlertViewStylePlainTextInput];

    // Change keyboard type
    [[dialog textFieldAtIndex:0] setKeyboardType:UIKeyboardTypeNumberPad];
    [dialog show];
}

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    if (buttonIndex == 1)
        NSLog(@"%@",[[alertView textFieldAtIndex:0]text]);
}

Answer 2

对于那些可能关心的人,这是一个有效的解决方案:

UIAlertView* dialog = [[UIAlertView alloc] init];
[dialog setDelegate:self];
[dialog setTitle:@"Enter Name"];
[dialog setMessage:@" "];
[dialog addButtonWithTitle:@"Cancel"];
[dialog addButtonWithTitle:@"OK"];

nameField = [[UITextField alloc] initWithFrame:CGRectMake(20.0, 45.0, 245.0, 25.0)];
[nameField setBackgroundColor:[UIColor whiteColor]];
[dialog addSubview:nameField];
CGAffineTransform moveUp = CGAffineTransformMakeTranslation(0.0, 100.0);
[dialog setTransform: moveUp];
[dialog show];
[dialog release];
[nameField release];

确保你已经创建了UITextField*nameField; 在.h文件中,您可以通过执行以下操作获取用户键入的文本:inputText = [nameField text];

在 - (void)alertView:(UIAlertView*)alert clickedButtonAtIndex:(NSInteger)buttonIndex方法.

重要提示: 对于iOS 4.0+,它CGAffineTransform会自动完成,因此如果您的目标只是4.0+,则可以将其删除.否则,您需要检查您所在的操作系统并相应地处理它.

Answer 3

值得一试

http://junecloud.com/journal/code/displaying-a-password-or-text-entry-prompt-on-the-iphone.html?cmd=success#comment3870

获得完整而全面的解决方案.

Answer 4

找到文本字段而不保留对其的明确引用的简单方法是设置其标记:

nameField.tag = ALERTVIEW_NAMEFIELD;

确保它与0和UIView您可能拥有的其他对象标签不同,包括父对话框!

然后在alertView:clickedButtonAtIndex:处理程序中,您可以通过以下方式检索文本字段:

UITextField *nameField = (UITextField *)[alertView viewWithTag:ALERTVIEW_NAMEFIELD];