iOS判断密码输入校验

判断是否由6-16位字母数字组成的密码

- (BOOL)checkPasswd:(NSString *)pwd {
	NSString *regex = @"(^ [A-Za-z0-9]{6,16}$)";
	NSPredicate * predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
	if (![predicate evaluateWithObject:psd]) {
   		// 不符合
    	return NO;
	}
	return YES;
}