当用户在文本字段中输入其他值而不是数字时如何显示警报 [英] how to show alert when user enter other then number value in textfield
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问题描述
我有一个iPhone应用程序,其中我输入了任何数字值,例如10 2 0 1 0.2等,我希望以此代替它,如果用户输入任何文本,它会提示您输入数字.
I have iphone app in which i enter any number value like 10 2 0 1 0.2 etc i want that instead of this if user enter any text it should alert that enter a number.
UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Value Must Be In Number " delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
推荐答案
尝试以下代码:
- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
if (textField==txtMobileNo)
{
[self validatePhone];
}else
{
[textField resignFirstResponder];
}
// called when 'return' key pressed. return NO to ignore.
return YES;
}
- (BOOL) validatePhone
{
NSString *phoneRegex = @"^+(?:[0-9] ?){6,14}[0-9]$";
NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", phoneRegex];
if ([phoneTest evaluateWithObject:txtMobileNo.text] == YES)
{
NSLog(@"proper phone nO ");
return YES;
}
else
{
UIAlertView *alert=[[UIAlertView alloc] initWithTitle:nil message:@"Please,Enter Your Person proper phone no" delegate:self cancelButtonTitle:@"Dismiss" otherButtonTitles:nil ];
[alert show];
[alert release];
NSLog(@"phone no. not in proper format");
return NO;
[txtMobileNo becomeFirstResponder];
}
}
希望您有所帮助.
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