ios-为银行卡号格式化 每隔四位添加一个空格

-(NSString *)formatterBankCardNum:(NSString *)string

{

NSString *tempStr=string;

NSInteger size =(tempStr.length / 4);

NSMutableArray *tmpStrArr = [[NSMutableArray alloc] init];

for (int n = 0;n < size; n++)

{

[tmpStrArr addObject:[tempStr substringWithRange:NSMakeRange(n*4, 4)]];

}

[tmpStrArr addObject:[tempStr substringWithRange:NSMakeRange(size*4, (tempStr.length % 4))]];

tempStr = [tmpStrArr componentsJoinedByString:@" "];

return tempStr;

}

----------------------------------textfield代理实现每隔四位添加空格-------------------------------------

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {

NSString *text = [textField text];

NSCharacterSet *characterSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789\b"];

string = [string stringByReplacingOccurrencesOfString:@" " withString:@""];

if ([string rangeOfCharacterFromSet:[characterSet invertedSet]].location != NSNotFound) {

return NO;

}

text = [text stringByReplacingCharactersInRange:range withString:string];

text = [text stringByReplacingOccurrencesOfString:@" " withString:@""];

NSString *newString = @"";

while (text.length > 0)

{

NSString *subString = [text substringToIndex:MIN(text.length, 4)];

newString = [newString stringByAppendingString:subString];

if (subString.length == 4) {

newString = [newString stringByAppendingString:@" "];

}

text = [text substringFromIndex:MIN(text.length, 4)];

}

newString = [newString stringByTrimmingCharactersInSet:[characterSet invertedSet]];

if (newString.length >= 24)

{

[_textFieldBankCardNumber resignFirstResponder];

return NO;

}

[textField setText:newString];

_textFieldBankCardNumber.text=textField.text;

return NO;

}