怎么实现这个代理。
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string :(id)sender
{
NSCharacterSet *cs;
//textField.delegate = self;
if(textField == phone)
{
NSLog(@"phone 数字");
cs = [[NSCharacterSet characterSetWithCharactersInString:NUMBERS] invertedSet];
NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];
BOOL basicTest = [string isEqualToString:filtered];
if(!basicTest)
{
UIAlertView* alert = [[UIAlertView alloc] initWithTitle:@"提示"
message:@"请输入数字"
delegate:nil
cancelButtonTitle:@"确定"
otherButtonTitles:nil];
[alert show];
//[alert release];
return NO;
}
}
return YES;
//其他的类型不需要检测,直接写入
//return YES;
}
这个委托是放在.m文件实现还是再建立个类别,在xib文件中还需要设置什么吗?
简单来说就是实现这个判断委托。