支持中文的简单文本文件输入保存相关
涉及很多个阶段，主要包括 ：
A； 文件创建，只是后缀名的问题，比较容易解决
B：内容 编辑阶段 ，这个比较复杂
C：内容保存到文件，基本使用 NSData？
D： 文件再次被打开？txt file－－－》进入到不可编辑模式了 。。。
转自：http://www.raywenderlich.com/4147/how-to-create-a-simple-magazine-app-with-core-text
code referense sample:https://github.com/omnigroup/OmniGroup/tree/master/Frameworks/OmniUI/iPad/Examples/TextEditor/--- newest,but too heavy
https://github.com/jonasschnelli/I7CoreTextExample ---oldest, maybe as a starter up
ios:
1。CoreText.framework 引用添加
2。#import <CoreText/CoreText.h>
3. CTFrmedraw/CTFramesetter/CGPathAndRef
---简单测试就发现画出来的core text文字是在底部而且是反的。很多底层的API采用的坐标系是Y轴反向的，在使用CT和uiview混合使用中记得要注意
先把内容坐标旋转：
Let’s fix the content orientation! Add the following code just after this line “CGContextRef context = UIGraphicsGetCurrentContext();”:
// Flip the coordinate system CGContextSetTextMatrix(context, CGAffineTransformIdentity); CGContextTranslateCTM(context, 0, self.bounds.size.height); CGContextScaleCTM(context, 1.0, -1.0); |
This is very simple code, which just flips the content by applying a transformation to the view’s context. Just copy/paste it each time you do drawing with CT.
You create a CTFramesetter reference and you provide it with NSAttributedString. At this point, an instance of CTTypesetter is automatically created for you, a class that manages your fonts. Next you use the CTFramesetter to create one or more frames in which you will be rendering text.
CTFramesetter /cttypesetter/ctline/ctrun几个基本的类型关系理解清楚。
自己需要完成类似超文本的解析，在一个复杂的string中完成这些内容，这个是否意味着其实这类txt文件即使copy出来，普通的文本编辑器也是无法直接编写的？
a tag will set the style of the text after the tag, the style will be applied until a new tag is found. The text markup will look like this:
These are <font color="red">red<font color="black"> and <font color="blue">blue <font color="black">words.
You create a CTFramesetter reference and you provide it with NSAttributedString. At this point, an instance of CTTypesetter is automatically created for you, a class that manages your fonts. Next you use the CTFramesetter to create one or more frames in which you will be rendering text.You create a CTFramesetter reference and you provide it with NSAttributedString. At this point, an instance of CTTypesetter is automatically created for you, a class that manages your fonts. Next you use the CTFramesetter to create one or more frames in which you will be rendering text.CoreText.frameworkYou’ll learn how to:You’ll learn how to:Let’s fix the content orientation! Add the following code just after this line “CGContextRef context = UIGraphicsGetCurrentContext();”
// Flip the coordinate system CGContextSetTextMatrix(context, CGAffineTransformIdentity); CGContextTranslateCTM(context, 0, self.bounds.size.height); CGContextScaleCTM(context, 1.0, -1.0); |
This is very simple code, which just flips the content by applying a transformation to the view’s context. Just copy/paste it each time you do drawing with CT.
- lay formatted text down on the screen;
- fine tune the text’s appearance;
- add images inside the text content;
- and finally create a magazine app, which loads text markup to easily control the formatting of the rendered text.
- lay formatted text down on the screen;
- fine tune the text’s appearance;
- add images inside the text content;
- and finally create a magazine app, which loads text markup to easily control the formatting of the rendered text.
注意 ： ：
大视频的压缩 似乎是自动的呢
http://blog.csdn.net/andypan1314/article/details/7614469
注意 ： ：
中文应用都要遇到一个很头疼的问题：文字编码，汉字的 GBK 和 国际通用的 UTF-8 的互相转化稍一不慎，就会满屏乱码。下面介绍 UTF-8 和 GBK 的 NSString 相互转化的方法
从 GBK 转到 UTF-8
用 NSStringEncoding enc = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000) ，然后就可以用initWithData：encoding来实现。
从 UTF-8 转到 GBK
CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000)，得到的enc却是kCFStringEncodingInvalidId。
没关系，试试 NSData *data=[nsstring dataUsingEncoding:-2147482063];
注意：必须使用kCFStringEncodingGB_18030_2000这个字符集，那个kCFStringEncodingGB_2312_80试了也不行。