xcode UIAlertView - 从通过代码添加的文本字段中检索文本字段值
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UIAlertView - retrieve textfield value from textfield added via code
提问by George
Here is the code I have to create an UIAlertView with a textbox.
这是我必须使用文本框创建 UIAlertView 的代码。
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Enter A Username Here" message:@"this gets covered!"
delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:@"OK!", nil];
UITextField *myTextField = [[UITextField alloc] initWithFrame:CGRectMake(12, 45, 260, 25)];
CGAffineTransform myTransform = CGAffineTransformMakeTranslation(0, 60);
[alert setTransform:myTransform];
alert.tag = kAlertSaveScore;
[myTextField setBackgroundColor:[UIColor whiteColor]];
[alert addSubview:myTextField];
[alert show];
[alert release];
[myTextField release];
My question is, how do I get the value from the textfield in:
我的问题是，如何从文本字段中获取值：
- (void) alertView:(UIAlertView *) actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
}
I know I can get the standard stuff for the alertview such as actionSheet.tag and such, but how would I get the above created textfield?
我知道我可以获得警报视图的标准内容，例如 actionSheet.tag 等，但是我如何获得上面创建的文本字段？
回答by Ed Marty
@interface MyClass {
UITextField *alertTextField;
}
@end
And instead of declaring it locally, just use that.
而不是在本地声明它，只需使用它。
//...
alertTextField = [[UITextField alloc] initWithFrame:CGRectMake(12, 45, 260, 25)];
//...
- (void) alertView:(UIAlertView *) alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
NSString *text = alertTextField.text;
alertTextField = nil;
}
回答by Jason Coco
Just give it a tag, and find it using the tag later. So, using your code:
只需给它一个标签，然后使用标签找到它。因此，使用您的代码：
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Enter A Username Here" message:@"this gets covered!"
delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:@"OK!", nil];
UITextField *myTextField = [[UITextField alloc] initWithFrame:CGRectMake(12, 45, 260, 25)];
CGAffineTransform myTransform = CGAffineTransformMakeTranslation(0, 60);
[alert setTransform:myTransform];
alert.tag = kAlertSaveScore;
// Give the text field some unique tag
[myTextField setTag:10250];
[myTextField setBackgroundColor:[UIColor whiteColor]];
[alert addSubview:myTextField];
[alert show];
[alert release];
[myTextField release];
Then, in the call-back, wherever that happens to be and without having to worry about memory management or state management of the text field:
然后，在回调中，无论发生在哪里，而不必担心文本字段的内存管理或状态管理：
- (void) alertView:(UIAlertView *) actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
// Get the field you added to the alert view earlier (you should also
// probably validate that this field is there and that it is a UITextField but...)
UITextField* myField = (UITextField*)[actionSheet viewWithTag:10250];
NSLog(@"Entered text: %@", [myField text]);
}
