彩虹文本在TextView，iOS和OSX [英] Rainbow text in TextView, iOS and OSX

问题描述

我想为应用程式加入一些不同的文字颜色，以便与图片融合。我有很多输入，我的用户想要彩虹文本颜色和重复。因此，例如： stackoverflow 看起来像这样： s = red t = orange a = yellow c = green k = blue o = purple v =粉红色e =红色r =橙色f =黄色l =绿色o =蓝色w =紫色

我如何可以在一个单一的 UITextView
有人知道如何可以实现这个用户正在输入？提示？示例？

我没有看到有关SO彩虹文本的任何其他帖子。

你可以使用 NSAttributedString ：

使其成为支持OSX和iOS的一般方法。现在不需要将 NSColor 更改为 UIColor ，在这两种操作系统上都可以使用。 >

  #if TARGET_OS_IPHONE 
 typedef UIColor Color; 
 #elif TARGET_OS_MAC 
 typedef NSColor Color; 
 #endif 
 
  - （NSAttributedString *）colorfulStringFrom：（NSString *）string {
 
 NSArray * colors = @ [[color redColor]，
 [color yellowColor]，
 [color blueColor]，
 [color blueColor]，
 [color purpleColor]，
 [color magentaColor] 
 
 NSMutableAttributedString * attribString = [[NSMutableAttributedString allocate] initWithString：string]; 
 
 for（NSInteger location = 0; location< string.length; location ++）{
 NSRange range = NSMakeRange（location，1）; 
颜色* color = colors [location％colors.count]; 
 [attribString addAttribute：NSForegroundColorAttributeName value：color range：range]; 
} 
 return attribString; 
} 
  

输出：

>

I'm trying to add some different text colors to my app to be fused to an image. I've got alot of input that my users would like a rainbow text color and repeat. So for instance the word: stackoverflow would look like this: s=red t=orange a=yellow c=green k=blue o=purple v=pink e=red r=orange f=yellow l=green o=blue w=purple

I can't even begin to think how I can do this in one single UITextView Does anyone know how I could achieve this as the user is typing? Tips? Example?

I didn't see any other posts on SO regarding rainbow text for iOS. (correct me if im wrong)

解决方案

You can do using NSAttributedString:

To make it a general method to support OSX and iOS. Now no need to change NSColor to UIColor, use this on both the operating systems.

#if TARGET_OS_IPHONE
    typedef UIColor Color;
#elif TARGET_OS_MAC
    typedef NSColor Color;
#endif

-(NSAttributedString *)colorfulStringFrom:(NSString *)string{

    NSArray *colors = @[[Color redColor],
                        [Color yellowColor],
                        [Color greenColor],
                        [Color blueColor],
                        [Color purpleColor],
                        [Color magentaColor]
                        ];

    NSMutableAttributedString *attribString = [[NSMutableAttributedString alloc]initWithString:string];

    for (NSInteger location=0; location<string.length; location++) {
        NSRange range = NSMakeRange(location, 1);
        Color *color = colors[location%colors.count];
        [attribString addAttribute:NSForegroundColorAttributeName value:color range:range];
    }
    return attribString;
}

Output:

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