iOS macOS限制输入框判断输入内容

鸣谢：HiroGuo

在开发过程中，有时需要对用户输入的类型做判断，最常见是在注册页面即用户名和密码，代码整理如下：

• 只能为中文

• -(BOOL)onlyInputChineseCharacters:(NSString*)string{
      NSString *zhString = @"[\u4e00-\u9fa5]+";
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",zhString];
      BOOL  inputString = [predicate evaluateWithObject:string];
      return inputString;
  }

• 只能为数字

• - (BOOL)onlyInputLowercaseLetter:(NSString*)string{
      NSString *regex =@"[a-z]*";
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
      BOOL  inputString = [predicate evaluateWithObject:string];
      return inputString;
  }

• 只能为小写

• - (BOOL)onlyInputLowercaseLetter:(NSString*)string{
      NSString *regex =@"[a-z]*";
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
      BOOL  inputString = [predicate evaluateWithObject:string];
      return inputString;
  }

• 只能为大写

• - (BOOL)onlyInputACapital:(NSString*)string{
      NSString *regex =@"[A-Z]*";
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
      BOOL  inputString = [predicate evaluateWithObject:string];
      return inputString;
  }

• 允许大小写

• - (BOOL)InputCapitalAndLowercaseLetter:(NSString*)string{
      NSString *regex =@"[a-zA-Z]*";
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
      BOOL  inputString = [predicate evaluateWithObject:string];
      return inputString;
  }

• 允许含大小写或数字(不限字数)

• - (BOOL)inputLettersOrNumbers:(NSString*)string{
      NSString *regex =@"[a-zA-Z0-9]*";
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
      BOOL  inputString = [predicate evaluateWithObject:string];
      return inputString;
  }

• 允许含大小写或数字(限字数)

• -(BOOL)inputNumberOrLetters:(NSString*)name {
      NSString *userNameRegex = @"^[A-Za-z0-9]{6,20}+$";
      NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex];
      BOOL  inputString = [userNamePredicate evaluateWithObject:name];
      return inputString;
  }

• 允许汉字或数字(不限字数)

• - (BOOL)inputChineseOrNumbers:(NSString*)string{
      NSString *regex =@"[\u4e00-\u9fa5]+[0-9]*";
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
      BOOL  inputString = [predicate evaluateWithObject:string];
      return inputString;
  }

• 允许汉字或数字(限字数)

• - (BOOL)inputChineseOrNumbersLimit:(NSString*)string{
      NSString *regex =@"[\u4e00-\u9fa5][0-9]{6,20}+$";
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
      BOOL  inputString = [predicate evaluateWithObject:string];
      return inputString;
  }

• 允许汉字，大小写或数字(不限字数)

• - (BOOL)inputChineseOrLettersAndNumbersNum:(NSString*)string{
      NSString *regex =@"[\u4e00-\u9fa5]+[A-Za-z0-9]*";
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
      BOOL  inputString = [predicate evaluateWithObject:string];
      return inputString;
  }

• 允许汉字，大小写或数字(限字数)

• - (BOOL)inputChineseOrLettersNumberslimit:(NSString*)string{
      NSString *regex =@"[\u4e00-\u9fa5]+[A-Za-z0-9]{6,20}+$";
      NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regex];
      BOOL  inputString = [predicate evaluateWithObject:string];
      return inputString;
  }