【IOS开发】UItextfield输入电话号码，自动调整格式

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range
replacementString:(NSString *)string
{
if (range.location == 13) {
return NO;
}else if (range.location == 8){

NSMutableString *str = [[NSMutableString alloc] initWithString:phoneField.text];
NSRange range = [str rangeOfString:@"-"];
if (range.location!=NSNotFound)
{

}else {
[str insertString:@"-" atIndex:3];
[str insertString:@"-" atIndex:8];
phoneField.text = str;
}
return YES;
}else if(range.location==9) {
NSMutableString *str = [[NSMutableString alloc] initWithString:phoneField.text];
NSString *str1;
str1 = [str stringByReplacingOccurrencesOfString:@"-"withString:@""];
phoneField.text = str1;
return YES;

}else
{
return YES;
}

}