限制输入密码长度
1、代码实现"密码至少为9位，并需包含大写字母、小写字母、数字或特殊字符等三种"
返回0、1、2为格式不正确，返回4为密码格式正确
-(int)checkIsHaveNumAndLetter:(NSString*)password
{
//数字条件
NSRegularExpression *tNumRegularExpression = [NSRegularExpression regularExpressionWithPattern:@"[0-9]" options:NSRegularExpressionCaseInsensitive error:nil];
//符合数字条件的有几个字节
NSUInteger tNumMatchCount = [tNumRegularExpression numberOfMatchesInString:password
options:NSMatchingReportProgress
range:NSMakeRange(0, password.length)];
//英文字条件
NSRegularExpression *sLetterRegularExpression = [NSRegularExpression regularExpressionWithPattern:@"[a-z]" options:NSRegularExpressionDotMatchesLineSeparators error:nil];
//符合英文字条件的有几个字节
NSUInteger sLetterMatchCount = [sLetterRegularExpression numberOfMatchesInString:password options:NSMatchingReportProgress range:NSMakeRange(0, password.length)];
//英文字条件
NSRegularExpression *tLetterRegularExpression = [NSRegularExpression regularExpressionWithPattern:@"[A-Z]" options:NSRegularExpressionDotMatchesLineSeparators error:nil];
//符合英文字条件的有几个字节
NSUInteger tLetterMatchCount = [tLetterRegularExpression numberOfMatchesInString:password options:NSMatchingReportProgress range:NSMakeRange(0, password.length)];
if (password.length < 9) {
// 密码长度不正确
return 0;
} else {
// 没有大写或小写
if (tLetterMatchCount == 0 || sLetterMatchCount == 0) {
return 1;
} else {
if (tNumMatchCount > 0) {
return 4;
} else{
if(tNumMatchCount + tLetterMatchCount + sLetterMatchCount < password.length){
return 4;
} else{
return 2;
}
}
}
}
}
需注意：NSRegularExpressionOptions，如果不区分大小写可以使用NSRegularExpressionCaseInsensitive
NSRegularExpressionCaseInsensitive = 1 << 0, // 不区分大小写的NSRegularExpressionAllowCommentsAndWhitespace = 1 << 1, // 忽略空格和# -NSRegularExpressionIgnoreMetacharacters = 1 << 2, // 整体化NSRegularExpressionDotMatchesLineSeparators = 1 << 3, // 匹配任何字符，包括行分隔符NSRegularExpressionAnchorsMatchLines = 1 << 4, // 允许^和$在匹配的开始和结束行NSRegularExpressionUseUnixLineSeparators = 1 << 5, // (查找范围为整个的话无效)NSRegularExpressionUseUnicodeWordBoundaries = 1 << 6 // (查找范围为整个的话无效)
