判断输入钱的正则表达式，可输入正负，小数点前5位，小数点后2位，位数可控

UItextField 代理方法

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

NSString *toString = [textField.text stringByReplacingCharactersInRange:range withString:string];

if (toString.length > 0) {

NSString *stringRegex = @"(\\+|\\-)?(([0]|(0[.]\\d{0,2}))|([1-9]\\d{0,4}(([.]\\d{0,2})?)))?";

NSPredicate *phoneTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", stringRegex];

BOOL flag = [phoneTest evaluateWithObject:toString];

if (!flag) {

return NO;

}

}

return YES;

}

来自 blog.csdn.net/xubaimiao/article/details/41144677