从textField中选择粗体和斜体文本

问题描述

如何只选择用户在textField / textView中输入的粗体和斜体文本？

我们可以选择文字粗体，斜体，下划线以及这三者的任意组合，反之亦然。

* 这不是特定于Mac OSX或iOS的，任何一个解决方案对我都有好处。

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我尝试通过读取属性字符串中的文本作为：

  NSAttributedString * string = self.textView.string; 
  

但是由于textView和textField返回 NSString 所有格式化都消失了。

解决方案

在iOS上使用attributText属性与标签/ textfields

在OSX上使用attributStringValue

，您可以通过attributText的属性枚举并检查每个属性。生成一些代码（osx& iOS）

  NSMutableAttributedString * str = [[NSMutableAttributedString alloc] initWithString：@none ]; 
 
 id temp = [[NSAttributedString alloc] initWithString：@boldattributes：@ {NSFontAttributeName：[UIFont boldSystemFontOfSize：12]}]; 
 [str appendAttributedString：temp]; 
 
 temp = [[NSAttributedString alloc] initWithString：@italic属性：@ {NSFontAttributeName：[UIFont italicSystemFontOfSize：12]}]; 
 [str appendAttributedString：temp]; 
 
 temp = [[NSAttributedString alloc] initWithString：@noneattributes：@ {NSFontAttributeName：[UIFont systemFontOfSize：12]}]; 
 [str appendAttributedString：temp]; 
 
 temp = [[NSAttributedString alloc] initWithString：@bold2attributes：@ {NSFontAttributeName：[UIFont boldSystemFontOfSize：12]}]; 
 [str appendAttributedString：temp]; 
 
 self.label.attributedText = str; 
 
 NSMutableString * italics = [NSMutableString string]; 
 NSMutableString * bolds = [NSMutableString string]; 
 NSMutableString * normals = [NSMutableString string]; 
 
 for（int i = 0; i  //可以被调整：通过考虑有效范围并且不检查每1 $ b的1 $ b // warn：==现在可能工作，但也许我会更冷，以检查字体traits使用CoreText 
 UIFont * font = [str attribute：NSFontAttributeName atIndex：i effectiveRange：nil]; 
 if（font == [UIFont italicSystemFontOfSize：12]）{
 [italics appendString：[[str mutableString] substringWithRange：NSMakeRange（i，1）]]; 
} else if（font == [UIFont boldSystemFontOfSize：12]）{
 [bolds appendString：[[str mutableString] substringWithRange：NSMakeRange（i，1）]]; 
} else {
 [normals appendString：[[str mutableString] substringWithRange：NSMakeRange（i，1）]]; 
} 
} 
 
 NSLog（@％@，italics）; 
 NSLog（@％@，bolds）; 
 NSLog（@％@，normals）; 
  

现在这里是如何找到它。从这里选择范围应该很简单：）

注意：你只能有一个连续的选择！在osx和ios上都不能选择textfield / textview的n个部分

How can I select only bold and italicized text entered by user in a textField/textView ?

We can make a selected text bold, italicized, underline and any combination of these three but what about its vice-versa.

*This is not specific to Mac OSX or iOS, solution in either one is good for me.

EDIT:

I tried by reading the text in attributed string as :

NSAttributedString *string=self.textView.string;

But as textView and textField returns NSString so all formatting is gone.

解决方案

on iOS use attributedText properties with labels/textfields

on OSX use attributedStringValue

you can then enumerate through the attributedText's attributes and check each attribute. Ill whip up some code (osx & iOS)

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"none "];

id temp = [[NSAttributedString alloc] initWithString:@"bold " attributes:@{NSFontAttributeName: [UIFont boldSystemFontOfSize:12]}];
[str appendAttributedString:temp];

temp = [[NSAttributedString alloc] initWithString:@"italic " attributes:@{NSFontAttributeName: [UIFont italicSystemFontOfSize:12]}];
[str appendAttributedString:temp];

temp = [[NSAttributedString alloc] initWithString:@"none " attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:12]}];
[str appendAttributedString:temp];

temp = [[NSAttributedString alloc] initWithString:@"bold2 " attributes:@{NSFontAttributeName: [UIFont boldSystemFontOfSize:12]}];
[str appendAttributedString:temp];

self.label.attributedText = str;

NSMutableString *italics = [NSMutableString string];
NSMutableString *bolds = [NSMutableString string];
NSMutableString *normals = [NSMutableString string];

for (int i=0; i<str.length; i++) {
    //could be tuned: MOSTLY by taking into account the effective range and not checking 1 per 1
    //warn: == might work now but maybe i'd be cooler to check font traits using CoreText
    UIFont *font = [str attribute:NSFontAttributeName atIndex:i effectiveRange:nil];
    if(font == [UIFont italicSystemFontOfSize:12]) {
        [italics appendString:[[str mutableString] substringWithRange:NSMakeRange(i, 1)]];
    } else if(font == [UIFont boldSystemFontOfSize:12]){
        [bolds appendString:[[str mutableString] substringWithRange:NSMakeRange(i, 1)]];
    } else {
        [normals appendString:[[str mutableString] substringWithRange:NSMakeRange(i, 1)]];
    }
}

NSLog(@"%@", italics);
NSLog(@"%@", bolds);
NSLog(@"%@", normals);

Now here is how to find it. Deducing a selection range from this should be easy peasy :)

Note: you can only have a continuous selection! neither on osx nor on ios can you select n parts of a textfield/textview

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