UITextView Alternative [英] UITextView Alternative

问题描述

正如我从Apple docs中了解的UITextView的attributesText属性：

As i understood from Apple docs attributedText property of UITextView:

默认情况下，此属性为零。为此属性分配新值也会使用相同的字符串数据替换text属性的值，尽管没有任何格式设置信息。此外，分配新值会更新font，textColor和textAlignment属性中的值，以便它们反映从属性字符串中的位置0开始的样式信息。

This property is nil by default. Assigning a new value to this property also replaces the value of the text property with the same string data, albeit without any formatting information. In addition, assigning a new a value updates the values in the font, textColor, and textAlignment properties so that they reflect the style information starting at location 0 in the attributed string.

因此，我不能在不同位置使用多个属性的代码添加一个attributionString。

Therefore i cannot add an attributedString by code with multiple Attributes at different locations.

有人可以帮助我通过代码创建以下效果在iOS6？这可以使用nib文件和更改UITextView中文本部分的范围属性，但我似乎无法通过代码重现效果。

Can someone please help me create the following effect by code in iOS6? This is possible using nib files and by changing range attributes for text parts in UITextView but i cant seem to reproduce the effect by code.

<'font systemFontOfSize = 18> 所需<'/ font> 效果<'textColor = [UIColor redColor]> 写入b <'/ textColor> y code 。

<'font systemFontOfSize=18>Desired<'/font> effect <'textColor = [UIColor redColor]> to be written b<'/textColor>y code.

假设标签对应于属性。

Suppose the tags correspond to attributes.

P.S。我不想使用CATextLayers，因为我正在尝试使用UITextView的AutoLayout功能。

P.S. I don't want to use CATextLayers since i am trying to use the AutoLayout feature with the UITextView.

推荐答案

你可以建立一个带有NSDictionary的NSAttributedString包含您需要的所有属性：

You can build an NSAttributedString with an NSDictionary containing all of the attributes you need:

NSAttributedString* attString = [[NSAttributedString alloc] 
               initWithString: @"Desired effect to be written by code" 
                   attributes: (NSDictionary*)attributes];

或者使用它的可变子类NSMutableAttributedString：

Or use it's mutable subclass NSMutableAttributedString:

NSMutableAttributedString *attString = [[NSMutableAttributedString alloc]  
               initWithString: @"Desired effect to be written by code"];

    [attString addAttribute: NSForegroundColorAttributeName 
                      value: [UIColor redColor] 
                      range: NSMakeRange(15,15)];

... etc

then ...

...etc
then...

myTextView.attributedText = attString;

每个属性都应用于字符串的NSRange（位置，长度）。不同的属性类型（例如颜色，字体大小）可以重叠不同的范围。

Each attribute is applied to an NSRange (location, length) of the string. Distinct attribute types (eg colour, font size) can overlap different ranges.

更新

使用NSMutableAttributedString示例。 NSAttributedString的initWithString：attributes 将在字符串的整个范围内应用属性，这是您要避免的，抱歉混淆。

update
Use the NSMutableAttributedString example. NSAttributedString's initWithString:attributes will apply attributes across the entire range of the string, which is what you are trying to avoid, sorry for confusion.

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