iOS 银行卡输4空1的方法

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因为项目有用到，所以记录下来以后直接用

1.添加代理方法

[self.cardNumberField addTarget:self action:@selector(specialDeal) forControlEvents:UIControlEventEditingChanged];

2.实现方法：

-(void)specialDeal
{
    CLog(@"**************");
    CLog(@"allCharacter=%d",allCharacter);（记录当前是输入还是删除,用来判断增加空格还是删除空格）
    CLog(@"self.cardNumberField=%d",self.cardNumberField.text.length);
    CLog(@"**************");
    if (allCharacter<self.cardNumberField.text.length) {
        if ((self.cardNumberField.text.length)%5==0) {
            if (self.cardNumberField.text.length<5) {

            }
            else{
                self.cardNumberField.text=[NSString stringWithFormat:@"%@ %@",[self.cardNumberField.text substringToIndex:self.cardNumberField.text.length-1],[self.cardNumberField.text substringFromIndex:self.cardNumberField.text.length-1]];
                CLog(@"%@",self.cardNumberField.text);
            }
        }
    }
    else{
        if ([self.cardNumberField.text hasSuffix:@" "]) {
            self.cardNumberField.text=[self.cardNumberField.text substringToIndex:self.cardNumberField.text.length-1];
        }
    }
    allCharacter=self.cardNumberField.text.length;

}

3.上传

NSString *cardNumber=[self.cardNumberField.text stringByReplacingOccurrencesOfString:@" " withString:@""];
CLog(@"%@",cardNumber);(用以上传给服务器的卡号)

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