textview's Skills

[A].禁用 拷贝、编辑

定义:UITextView * tv = [[UITextView alloc] initWithFrame:SCREEN_Bounds];

[ 1 ].可拷贝，不可编辑

 tv.editable = NO; //不可编辑

[ 2 ].不可拷贝，不可编辑

 tv.delegate = self;
 tv.editable = YES; //可编辑



  #pragma mark - UITextViewDelegate
  -(BOOL)textViewShouldBeginEditing:(UITextView *)textView {
     return NO; //开始编辑就停止
 }

[B].键盘遮挡住 TextView （⛔️报错⛔️）

报错：

2017-08-11 16:33:33.293831 cuteKids[10465:317797] 0x60800014d7e0 Copy matching assets reply: XPC_TYPE_DICTIONARY  <dictionary: 0x60800014d7e0> { count = 1, transaction: 0, voucher = 0x0, contents =
    "Result" => <int64: 0x60800003e260>: 29
}
2017-08-11 16:33:33.294494 cuteKids[10465:317797] 0x60800014c8c0 Daemon configuration query reply: XPC_TYPE_DICTIONARY  <dictionary: 0x60800014c8c0> { count = 2, transaction: 0, voucher = 0x0, contents =
    "Dictionary" => <dictionary: 0x60800014c130> { count = 1, transaction: 0, voucher = 0x0, contents =
        "ServerURL" => <dictionary: 0x60800014daa0> { count = 3, transaction: 0, voucher = 0x0, contents =
    	     "com.apple.CFURL.magic" => <uuid: 0x608000249f30> C3853DCC-9776-4114-B6C1-FD9F51944A6D
         	 "com.apple.CFURL.string" => <string: 0x60800024bee0> { length = 30, contents = "https://mesu.apple.com/assets/" }
    	     "com.apple.CFURL.base" => <null: 0x10ac19f20>: null-object
        }
     }
     "Result" => <int64: 0x608000037fe0>: 0
}
2017-08-11 16:33:33.294780 cuteKids[10465:317797] [MobileAssetError:29] Unable to copy asset information from https://mesu.apple.com/assets/ for asset type com.apple.MobileAsset.TextInput.SpellChecker

原因：

由于键盘会遮盖住textview,所以需要实现键盘弹出修改scrollview的位置。

解决：

 _mytextView.autocorrectionType = UITextAutocorrectionTypeNo; //⭐️必须添加⭐️
 _mytextView.spellCheckingType = UITextSpellCheckingTypeNo;

[C].禁用Emoji (输入忽略)

UITextField：

_placeTF = [[UITextField alloc] init];
_placeTF.placeholder = @"请输入活动地点";
_placeTF.clearButtonMode = UITextFieldViewModeWhileEditing;
_placeTF.delegate = self;

//监听UITextField的编辑状态
[_placeTF addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged];




- (void)textFieldDidChange:(UITextField *)textField {
     //正则表达式
     NSRegularExpression *regularExpression = [NSRegularExpression regularExpressionWithPattern:@"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]" options:0 error:nil];

     NSString *noEmojiStr = [regularExpression stringByReplacingMatchesInString:textField.text options:0 range:NSMakeRange(0, textField.text.length) withTemplate:@""];

     if (![noEmojiStr isEqualToString:textField.text]) {
            textField.text = noEmojiStr;
    }
}

判断字符串是否是Emoji

- (BOOL)isEmoji:(NSString *)string {
    if ([string length]<2)
    {
        return NO;
    }

    static NSCharacterSet *_variationSelectors;
    _variationSelectors = [NSCharacterSet characterSetWithRange:NSMakeRange(0xFE00, 16)];

    if ([string rangeOfCharacterFromSet: _variationSelectors].location != NSNotFound)
    {
        return YES;
    }
    const unichar high = [string characterAtIndex:0];
    // Surrogate pair (U+1D000-1F9FF)
    if (0xD800 <= high && high <= 0xDBFF)
    {
        const unichar low = [string characterAtIndex: 1];
        const int codepoint = ((high - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000;
        return (0x1D000 <= codepoint && codepoint <= 0x1F9FF);
        // Not surrogate pair (U+2100-27BF)
    }
    else
    {
        return (0x2100 <= high && high <= 0x27BF);
    }
}

UITextView：

_detailTV = [[UITextView alloc] init];
_detailTV.scrollEnabled = NO;
_detailTV.bounces = NO;
_detailTV.font = [UIFont systemFontOfSize:17.f];
_detailTV.delegate = self;



#pragma mark - UITextViewDelegate     (协议方法)
-(void)textViewDidChange:(UITextView *)textView{ //编辑状态改变
      //正则表达式
      NSRegularExpression *regularExpression = [NSRegularExpression regularExpressionWithPattern:@"[^\\u0020-\\u007E\\u00A0-\\u00BE\\u2E80-\\uA4CF\\uF900-\\uFAFF\\uFE30-\\uFE4F\\uFF00-\\uFFEF\\u0080-\\u009F\\u2000-\\u201f\r\n]" options:0 error:nil];

      NSString *noEmojiStr = [regularExpression stringByReplacingMatchesInString:textView.text options:0 range:NSMakeRange(0, textView.text.length) withTemplate:@""];

      if (![noEmojiStr isEqualToString:textView.text]) {
           textView.text = noEmojiStr;
      }
}

（2017.09.07）

goyohol's essay